diff --git a/services/web/app/src/Features/SplitTests/SplitTestCache.js b/services/web/app/src/Features/SplitTests/SplitTestCache.js
new file mode 100644
index 0000000000..57b447a7b9
--- /dev/null
+++ b/services/web/app/src/Features/SplitTests/SplitTestCache.js
@@ -0,0 +1,25 @@
+const SplitTestManager = require('./SplitTestManager')
+const { SplitTest } = require('../../models/SplitTest')
+const { CacheLoader } = require('cache-flow')
+
+class SplitTestCache extends CacheLoader {
+  constructor() {
+    super('split-test', {
+      expirationTime: 60, // 1min in seconds
+    })
+  }
+
+  async load(name) {
+    return await SplitTestManager.getSplitTestByName(name)
+  }
+
+  serialize(value) {
+    return value.toObject()
+  }
+
+  deserialize(value) {
+    return new SplitTest(value)
+  }
+}
+
+module.exports = new SplitTestCache()
diff --git a/services/web/app/src/Features/SplitTests/SplitTestController.js b/services/web/app/src/Features/SplitTests/SplitTestController.js
new file mode 100644
index 0000000000..fd429cb86d
--- /dev/null
+++ b/services/web/app/src/Features/SplitTests/SplitTestController.js
@@ -0,0 +1,77 @@
+const SplitTestManager = require('./SplitTestManager')
+
+async function getSplitTests(req, res, next) {
+  try {
+    const splitTests = await SplitTestManager.getSplitTests()
+    res.send(splitTests)
+  } catch (error) {
+    res.status(500).json({
+      error: `Error while fetching split tests list: ${error.message}`,
+    })
+  }
+}
+
+async function createSplitTest(req, res, next) {
+  const { name, configuration } = req.body
+  try {
+    const splitTest = await SplitTestManager.createSplitTest(
+      name,
+      configuration
+    )
+    res.send(splitTest)
+  } catch (error) {
+    res
+      .status(500)
+      .json({ error: `Error while creating split test: ${error.message}` })
+  }
+}
+
+async function updateSplitTest(req, res, next) {
+  const { name, configuration } = req.body
+  try {
+    const splitTest = await SplitTestManager.updateSplitTest(
+      name,
+      configuration
+    )
+    res.send(splitTest)
+  } catch (error) {
+    res
+      .status(500)
+      .json({ error: `Error while updating split test: ${error.message}` })
+  }
+}
+
+async function switchToNextPhase(req, res, next) {
+  const { name } = req.body
+  try {
+    const splitTest = await SplitTestManager.switchToNextPhase(name)
+    res.send(splitTest)
+  } catch (error) {
+    res.status(500).json({
+      error: `Error while switching split test to next phase: ${error.message}`,
+    })
+  }
+}
+
+async function revertToPreviousVersion(req, res, next) {
+  const { name, versionNumber } = req.body
+  try {
+    const splitTest = await SplitTestManager.revertToPreviousVersion(
+      name,
+      versionNumber
+    )
+    res.send(splitTest)
+  } catch (error) {
+    res.status(500).json({
+      error: `Error while reverting to previous version: ${error.message}`,
+    })
+  }
+}
+
+module.exports = {
+  getSplitTests,
+  createSplitTest,
+  updateSplitTest,
+  switchToNextPhase,
+  revertToPreviousVersion,
+}
diff --git a/services/web/app/src/Features/SplitTests/SplitTestHandler.js b/services/web/app/src/Features/SplitTests/SplitTestHandler.js
index ec60b04937..0a08aad2de 100644
--- a/services/web/app/src/Features/SplitTests/SplitTestHandler.js
+++ b/services/web/app/src/Features/SplitTests/SplitTestHandler.js
@@ -114,8 +114,14 @@ function _getPercentile(userId, splitTestId) {
 }
 
 module.exports = {
+  /**
+   * @deprecated: use SplitTestV2Handler.getAssignment instead
+   */
   getTestSegmentation: callbackify(getTestSegmentation),
   promises: {
+    /**
+     * @deprecated: use SplitTestV2Handler.promises.getAssignment instead
+     */
     getTestSegmentation,
   },
 }
diff --git a/services/web/app/src/Features/SplitTests/SplitTestManager.js b/services/web/app/src/Features/SplitTests/SplitTestManager.js
new file mode 100644
index 0000000000..6a321a377b
--- /dev/null
+++ b/services/web/app/src/Features/SplitTests/SplitTestManager.js
@@ -0,0 +1,230 @@
+const { SplitTest } = require('../../models/SplitTest')
+const OError = require('@overleaf/o-error')
+const _ = require('lodash')
+
+const ALPHA_PHASE = 'alpha'
+const BETA_PHASE = 'beta'
+const RELEASE_PHASE = 'release'
+
+async function getSplitTests() {
+  try {
+    return await SplitTest.find().exec()
+  } catch (error) {
+    throw OError.tag(error, 'Failed to get split tests list')
+  }
+}
+
+async function getSplitTestByName(name) {
+  try {
+    return await SplitTest.findOne({ name }).exec()
+  } catch (error) {
+    throw OError.tag(error, 'Failed to get split test', { name })
+  }
+}
+
+async function createSplitTest(name, configuration) {
+  const stripedVariants = []
+  let stripeStart = 0
+  _checkNewVariantsConfiguration([], configuration.variants)
+  for (const variant of configuration.variants) {
+    stripedVariants.push({
+      name: variant.name,
+      active: variant.active,
+      rolloutPercent: variant.rolloutPercent,
+      rolloutStripes: [
+        {
+          start: stripeStart,
+          end: stripeStart + variant.rolloutPercent,
+        },
+      ],
+    })
+    stripeStart += variant.rolloutPercent
+  }
+  const splitTest = new SplitTest({
+    name,
+    versions: [
+      {
+        versionNumber: 1,
+        phase: configuration.phase,
+        active: configuration.active,
+        variants: stripedVariants,
+      },
+    ],
+  })
+  return _saveSplitTest(splitTest)
+}
+
+async function updateSplitTest(name, configuration) {
+  const splitTest = await getSplitTestByName(name)
+  if (splitTest) {
+    const lastVersion = splitTest.getCurrentVersion().toObject()
+    if (configuration.phase !== lastVersion.phase) {
+      throw new OError(
+        `Cannot update with different phase - use switchToNextPhase endpoint instead`
+      )
+    }
+    _checkNewVariantsConfiguration(lastVersion.variants, configuration.variants)
+    const updatedVariants = _updateVariantsWithNewConfiguration(
+      lastVersion.variants,
+      configuration.variants
+    )
+    splitTest.versions.push({
+      versionNumber: lastVersion.versionNumber + 1,
+      phase: configuration.phase,
+      active: configuration.active,
+      variants: updatedVariants,
+    })
+    return _saveSplitTest(splitTest)
+  } else {
+    throw new OError(`Cannot update split test '${name}': not found`)
+  }
+}
+
+async function switchToNextPhase(name) {
+  const splitTest = await getSplitTestByName(name)
+  if (splitTest) {
+    const lastVersionCopy = splitTest.getCurrentVersion().toObject()
+    lastVersionCopy.versionNumber++
+    if (lastVersionCopy.phase === ALPHA_PHASE) {
+      lastVersionCopy.phase = BETA_PHASE
+    } else if (lastVersionCopy.phase === BETA_PHASE) {
+      if (splitTest.forbidReleasePhase) {
+        throw new OError('Switch to release phase is disabled for this test')
+      }
+      lastVersionCopy.phase = RELEASE_PHASE
+    } else if (splitTest.phase === RELEASE_PHASE) {
+      throw new OError(
+        `Split test with ID '${name}' is already in the release phase`
+      )
+    }
+    for (const variant of lastVersionCopy.variants) {
+      variant.rolloutPercent = 0
+      variant.rolloutStripes = []
+    }
+    splitTest.versions.push(lastVersionCopy)
+    return _saveSplitTest(splitTest)
+  } else {
+    throw new OError(
+      `Cannot switch split test with ID '${name}' to next phase: not found`
+    )
+  }
+}
+
+async function revertToPreviousVersion(name, versionNumber) {
+  const splitTest = await getSplitTestByName(name)
+  if (splitTest) {
+    if (splitTest.versions.length <= 1) {
+      throw new OError(
+        `Cannot revert split test with ID '${name}' to previous version: split test must have at least 2 versions`
+      )
+    }
+    const previousVersion = splitTest.getVersion(versionNumber)
+    if (!previousVersion) {
+      throw new OError(
+        `Cannot revert split test with ID '${name}' to version number ${versionNumber}: version not found`
+      )
+    }
+    const lastVersion = splitTest.getCurrentVersion()
+    if (
+      lastVersion.phase === RELEASE_PHASE &&
+      previousVersion.phase !== RELEASE_PHASE
+    ) {
+      splitTest.forbidReleasePhase = true
+    }
+    const previousVersionCopy = previousVersion.toObject()
+    previousVersionCopy.versionNumber = lastVersion.versionNumber + 1
+    splitTest.versions.push(previousVersionCopy)
+    return _saveSplitTest(splitTest)
+  } else {
+    throw new OError(
+      `Cannot revert split test with ID '${name}' to previous version: not found`
+    )
+  }
+}
+
+function _checkNewVariantsConfiguration(variants, newVariantsConfiguration) {
+  const totalRolloutPercentage = _getTotalRolloutPercentage(
+    newVariantsConfiguration
+  )
+  if (totalRolloutPercentage > 100) {
+    throw new OError(`Total variants rollout percentage cannot exceed 100`)
+  }
+  for (const variant of variants) {
+    const newVariantConfiguration = _.find(newVariantsConfiguration, {
+      name: variant.name,
+    })
+    if (!newVariantConfiguration) {
+      throw new OError(
+        `Variant defined in previous version as ${JSON.stringify(
+          variant
+        )} cannot be removed in new configuration: either set it inactive or create a new split test`
+      )
+    }
+    if (newVariantConfiguration.rolloutPercent < variant.rolloutPercent) {
+      throw new OError(
+        `Rollout percentage for variant defined in previous version as ${JSON.stringify(
+          variant
+        )} cannot be decreased: revert to a previous configuration instead`
+      )
+    }
+  }
+}
+
+function _updateVariantsWithNewConfiguration(
+  variants,
+  newVariantsConfiguration
+) {
+  let totalRolloutPercentage = _getTotalRolloutPercentage(variants)
+  const variantsCopy = _.clone(variants)
+  for (const newVariantConfig of newVariantsConfiguration) {
+    const variant = _.find(variantsCopy, { name: newVariantConfig.name })
+    if (!variant) {
+      variantsCopy.push({
+        name: newVariantConfig.name,
+        active: newVariantConfig.active,
+        rolloutPercent: newVariantConfig.rolloutPercent,
+        rolloutStripes: [
+          {
+            start: totalRolloutPercentage,
+            end: totalRolloutPercentage + newVariantConfig.rolloutPercent,
+          },
+        ],
+      })
+      totalRolloutPercentage += newVariantConfig.rolloutPercent
+    } else if (variant.rolloutPercent < newVariantConfig.rolloutPercent) {
+      const newStripeSize =
+        newVariantConfig.rolloutPercent - variant.rolloutPercent
+      variant.active = newVariantConfig.active
+      variant.rolloutPercent = newVariantConfig.rolloutPercent
+      variant.rolloutStripes.push({
+        start: totalRolloutPercentage,
+        end: totalRolloutPercentage + newStripeSize,
+      })
+      totalRolloutPercentage += newStripeSize
+    }
+  }
+  return variantsCopy
+}
+
+function _getTotalRolloutPercentage(variants) {
+  return _.sumBy(variants, 'rolloutPercent')
+}
+
+async function _saveSplitTest(splitTest) {
+  try {
+    return (await splitTest.save()).toObject()
+  } catch (error) {
+    throw OError.tag(error, 'Failed to save split test', {
+      splitTest: JSON.stringify(splitTest),
+    })
+  }
+}
+
+module.exports = {
+  getSplitTestByName,
+  getSplitTests,
+  createSplitTest,
+  updateSplitTest,
+  switchToNextPhase,
+  revertToPreviousVersion,
+}
diff --git a/services/web/app/src/Features/SplitTests/SplitTestRouter.js b/services/web/app/src/Features/SplitTests/SplitTestRouter.js
new file mode 100644
index 0000000000..af84174886
--- /dev/null
+++ b/services/web/app/src/Features/SplitTests/SplitTestRouter.js
@@ -0,0 +1,49 @@
+const SplitTestController = require('./SplitTestController')
+const AuthorizationMiddleware = require('../Authorization/AuthorizationMiddleware')
+const Features = require('../../infrastructure/Features')
+
+module.exports = {
+  apply(webRouter) {
+    if (Features.hasFeature('saas')) {
+      webRouter.get(
+        '/admin/splitTests',
+        AuthorizationMiddleware.ensureUserIsSiteAdmin,
+        SplitTestController.getSplitTests
+      )
+
+      webRouter.post(
+        '/admin/createSplitTest',
+        AuthorizationMiddleware.ensureUserIsSiteAdmin,
+        SplitTestController.createSplitTest
+      )
+      webRouter.csrf.disableDefaultCsrfProtection('/admin/splitTest', 'PUT')
+
+      webRouter.post(
+        '/admin/updateSplitTest',
+        AuthorizationMiddleware.ensureUserIsSiteAdmin,
+        SplitTestController.updateSplitTest
+      )
+      webRouter.csrf.disableDefaultCsrfProtection('/admin/splitTest', 'POST')
+
+      webRouter.post(
+        '/admin/splitTest/switchToNextPhase',
+        AuthorizationMiddleware.ensureUserIsSiteAdmin,
+        SplitTestController.switchToNextPhase
+      )
+      webRouter.csrf.disableDefaultCsrfProtection(
+        '/admin/splitTest/switchToNextPhase',
+        'POST'
+      )
+
+      webRouter.post(
+        '/admin/splitTest/revertToPreviousVersion',
+        AuthorizationMiddleware.ensureUserIsSiteAdmin,
+        SplitTestController.revertToPreviousVersion
+      )
+      webRouter.csrf.disableDefaultCsrfProtection(
+        '/admin/splitTest/revertToPreviousVersion',
+        'POST'
+      )
+    }
+  },
+}
diff --git a/services/web/app/src/Features/SplitTests/SplitTestV2Handler.js b/services/web/app/src/Features/SplitTests/SplitTestV2Handler.js
new file mode 100644
index 0000000000..01bcc889fc
--- /dev/null
+++ b/services/web/app/src/Features/SplitTests/SplitTestV2Handler.js
@@ -0,0 +1,177 @@
+const UserGetter = require('../User/UserGetter')
+const UserUpdater = require('../User/UserUpdater')
+const AnalyticsManager = require('../Analytics/AnalyticsManager')
+const crypto = require('crypto')
+const _ = require('lodash')
+const { callbackify } = require('util')
+const splitTestCache = require('./SplitTestCache')
+
+const DEFAULT_VARIANT = 'default'
+const ALPHA_PHASE = 'alpha'
+const BETA_PHASE = 'beta'
+
+/**
+ * Get the assignment of a user to a split test.
+ *
+ * @example
+ * // Assign user and record an event
+ *
+ * const assignment = await SplitTestV2Handler.getAssignment(userId, 'example-project')
+ * if (assignment.variant === 'awesome-new-version') {
+ *   // execute my awesome change
+ * }
+ * else {
+ *   // execute the default behaviour (control group)
+ * }
+ * // then record an event
+ * AnalyticsManager.recordEvent(userId, 'example-project-created', {
+ *   projectId: project._id,
+ *   ...assignment.analytics.segmentation
+ * })
+ *
+ * @param userId the user's ID
+ * @param splitTestName the unique name of the split test
+ * @param options {sync: boolean} - for test purposes only, to force the synchronous update of the user's profile
+ * @returns {Promise<{analytics: {segmentation: {}}, variant: string}|{analytics: {segmentation: {phase, splitTest, variant: string, versionNumber}}, variant: string}>}
+ */
+async function getAssignment(userId, splitTestName, options) {
+  const splitTest = await splitTestCache.get(splitTestName)
+
+  if (splitTest) {
+    const currentVersion = splitTest.getCurrentVersion()
+    if (currentVersion.active) {
+      const {
+        activeForUser,
+        selectedVariantName,
+        phase,
+        versionNumber,
+      } = await _getAssignmentMetadata(userId, splitTest)
+      if (activeForUser) {
+        const assignmentConfig = {
+          userId,
+          splitTestName,
+          variantName: selectedVariantName,
+          phase,
+          versionNumber,
+        }
+        if (options && options.sync === true) {
+          await _updateVariantAssignment(assignmentConfig)
+        } else {
+          _updateVariantAssignment(assignmentConfig)
+        }
+        return {
+          variant: selectedVariantName,
+          analytics: {
+            segmentation: {
+              splitTest: splitTestName,
+              variant: selectedVariantName,
+              phase,
+              versionNumber,
+            },
+          },
+        }
+      }
+    }
+  }
+  return {
+    variant: DEFAULT_VARIANT,
+    analytics: {
+      segmentation: {},
+    },
+  }
+}
+
+async function _getAssignmentMetadata(userId, splitTest) {
+  const currentVersion = splitTest.getCurrentVersion()
+  const phase = currentVersion.phase
+  if ([ALPHA_PHASE, BETA_PHASE].includes(phase)) {
+    const user = await _getUser(userId)
+    if (
+      (phase === ALPHA_PHASE && !(user && user.alphaProgram)) ||
+      (phase === BETA_PHASE && !(user && user.betaProgram))
+    ) {
+      return {
+        activeForUser: false,
+      }
+    }
+  }
+  const percentile = _getPercentile(userId, splitTest.name, phase)
+  const selectedVariantName = _getVariantFromPercentile(
+    currentVersion.variants,
+    percentile
+  )
+  return {
+    activeForUser: true,
+    selectedVariantName: selectedVariantName || DEFAULT_VARIANT,
+    phase,
+    versionNumber: currentVersion.versionNumber,
+  }
+}
+
+function _getPercentile(userId, splitTestName, splitTestPhase) {
+  const hash = crypto
+    .createHash('md5')
+    .update(userId + splitTestName + splitTestPhase)
+    .digest('hex')
+  const hashPrefix = hash.substr(0, 8)
+  return Math.floor(
+    ((parseInt(hashPrefix, 16) % 0xffffffff) / 0xffffffff) * 100
+  )
+}
+
+function _getVariantFromPercentile(variants, percentile) {
+  for (const variant of variants) {
+    for (const stripe of variant.rolloutStripes) {
+      if (percentile >= stripe.start && percentile < stripe.end) {
+        return variant.name
+      }
+    }
+  }
+}
+
+async function _updateVariantAssignment({
+  userId,
+  splitTestName,
+  phase,
+  versionNumber,
+  variantName,
+}) {
+  const user = await _getUser(userId)
+  if (user) {
+    const assignedSplitTests = user.splitTests || []
+    const assignmentLog = assignedSplitTests[splitTestName] || []
+    const existingAssignment = _.find(assignmentLog, { versionNumber })
+    if (!existingAssignment) {
+      await UserUpdater.promises.updateUser(userId, {
+        $addToSet: {
+          [`splitTests.${splitTestName}`]: {
+            variantName,
+            versionNumber,
+            phase,
+            assignedAt: new Date(),
+          },
+        },
+      })
+      AnalyticsManager.setUserProperty(
+        userId,
+        `split-test-${splitTestName}-${versionNumber}`,
+        variantName
+      )
+    }
+  }
+}
+
+async function _getUser(id) {
+  return UserGetter.promises.getUser(id, {
+    splitTests: 1,
+    alphaProgram: 1,
+    betaProgram: 1,
+  })
+}
+
+module.exports = {
+  getAssignment: callbackify(getAssignment),
+  promises: {
+    getAssignment,
+  },
+}
diff --git a/services/web/app/src/models/SplitTest.js b/services/web/app/src/models/SplitTest.js
new file mode 100644
index 0000000000..dc998f6d4d
--- /dev/null
+++ b/services/web/app/src/models/SplitTest.js
@@ -0,0 +1,111 @@
+const mongoose = require('../infrastructure/Mongoose')
+const { Schema } = mongoose
+const _ = require('lodash')
+
+const MIN_NAME_LENGTH = 3
+const MAX_NAME_LENGTH = 200
+const MIN_VARIANT_NAME_LENGTH = 3
+const MAX_VARIANT_NAME_LENGTH = 255
+const NAME_REGEX = /^[a-zA-Z0-9\-_]+$/
+
+const RolloutPercentType = {
+  type: Number,
+  default: 0,
+  min: [0, 'Rollout percentage must be between 0 and 100, got {VALUE}'],
+  max: [100, 'Rollout percentage must be between 0 and 100, got {VALUE}'],
+  required: true,
+}
+
+const VariantSchema = new Schema(
+  {
+    name: {
+      type: String,
+      minLength: MIN_VARIANT_NAME_LENGTH,
+      maxLength: MAX_VARIANT_NAME_LENGTH,
+      required: true,
+      validate: {
+        validator: function (input) {
+          return input !== null && input !== 'default' && NAME_REGEX.test(input)
+        },
+        message: `invalid, cannot be 'default' and must match: ${NAME_REGEX}, got {VALUE}`,
+      },
+    },
+    active: {
+      type: Boolean,
+      default: true,
+      required: true,
+    },
+    rolloutPercent: RolloutPercentType,
+    rolloutStripes: [
+      {
+        start: RolloutPercentType,
+        end: RolloutPercentType,
+      },
+    ],
+  },
+  { _id: false }
+)
+
+const VersionSchema = new Schema(
+  {
+    versionNumber: {
+      type: Number,
+      default: 1,
+      min: [1, 'must be 1 or higher, got {VALUE}'],
+      required: true,
+    },
+    phase: {
+      type: String,
+      default: 'alpha',
+      enum: ['alpha', 'beta', 'release'],
+      required: true,
+    },
+    active: {
+      type: Boolean,
+      default: true,
+      required: true,
+    },
+    variants: [VariantSchema],
+  },
+  { _id: false }
+)
+
+const SplitTestSchema = new Schema({
+  name: {
+    type: String,
+    minLength: MIN_NAME_LENGTH,
+    maxlength: MAX_NAME_LENGTH,
+    required: true,
+    unique: true,
+    validate: {
+      validator: function (input) {
+        return input !== null && NAME_REGEX.test(input)
+      },
+      message: `invalid, must match: ${NAME_REGEX}`,
+    },
+  },
+  versions: [VersionSchema],
+  forbidReleasePhase: {
+    type: Boolean,
+    required: false,
+  },
+})
+
+SplitTestSchema.methods.getCurrentVersion = function () {
+  if (this.versions && this.versions.length > 0) {
+    return _.maxBy(this.versions, 'versionNumber')
+  } else {
+    return undefined
+  }
+}
+
+SplitTestSchema.methods.getVersion = function (versionNumber) {
+  return _.find(this.versions || [], {
+    versionNumber,
+  })
+}
+
+module.exports = {
+  SplitTest: mongoose.model('SplitTest', SplitTestSchema),
+  SplitTestSchema,
+}
diff --git a/services/web/app/src/router.js b/services/web/app/src/router.js
index 0e5657c85e..38d8df3d07 100644
--- a/services/web/app/src/router.js
+++ b/services/web/app/src/router.js
@@ -49,6 +49,7 @@ const InstitutionsController = require('./Features/Institutions/InstitutionsCont
 const UserMembershipRouter = require('./Features/UserMembership/UserMembershipRouter')
 const SystemMessageController = require('./Features/SystemMessages/SystemMessageController')
 const AnalyticsRegistrationSourceMiddleware = require('./Features/Analytics/AnalyticsRegistrationSourceMiddleware')
+const SplitTestRouter = require('./Features/SplitTests/SplitTestRouter')
 const { Joi, validate } = require('./infrastructure/Validation')
 const {
   renderUnsupportedBrowserPage,
@@ -107,6 +108,7 @@ function initialize(webRouter, privateApiRouter, publicApiRouter) {
   LinkedFilesRouter.apply(webRouter, privateApiRouter, publicApiRouter)
   TemplatesRouter.apply(webRouter)
   UserMembershipRouter.apply(webRouter)
+  SplitTestRouter.apply(webRouter)
 
   Modules.applyRouter(webRouter, privateApiRouter, publicApiRouter)
 
diff --git a/services/web/package-lock.json b/services/web/package-lock.json
index 2fb0d81388..498e48d425 100644
--- a/services/web/package-lock.json
+++ b/services/web/package-lock.json
@@ -14856,6 +14856,74 @@
         }
       }
     },
+    "cache-flow": {
+      "version": "1.7.4",
+      "resolved": "https://registry.npmjs.org/cache-flow/-/cache-flow-1.7.4.tgz",
+      "integrity": "sha512-EbU+Gcqddasv1hkUtqMTcEjP5HF+Gu7o0qDikaahsYwnu8ysusJfGa1GtUM/rfimFY7QrOO3p5sIFALrztyt0w==",
+      "requires": {
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@@ -19791,6 +19961,12 @@
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@@ -25208,6 +25397,37 @@
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@@ -36166,6 +36404,11 @@
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diff --git a/services/web/package.json b/services/web/package.json
index 34419faba1..70d57dc6a5 100644
--- a/services/web/package.json
+++ b/services/web/package.json
@@ -77,6 +77,7 @@
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@@ -194,6 +195,7 @@
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     "cheerio": "^1.0.0-rc.3",
     "copy-webpack-plugin": "^5.1.1",
diff --git a/services/web/test/acceptance/src/SplitTestTests.js b/services/web/test/acceptance/src/SplitTestTests.js
new file mode 100644
index 0000000000..f6fc97af3a
--- /dev/null
+++ b/services/web/test/acceptance/src/SplitTestTests.js
@@ -0,0 +1,1416 @@
+const SplitTestV2Handler = require('../../../app/src/Features/SplitTests/SplitTestV2Handler')
+const User = require('./helpers/User')
+const { db } = require('../../../app/src/infrastructure/mongodb')
+const { ObjectId } = require('mongodb')
+const chai = require('chai')
+const chaiExclude = require('chai-exclude')
+const { promisify } = require('../../../app/src/util/promises')
+const { assert } = chai
+const { CacheFlow } = require('cache-flow')
+chai.use(chaiExclude)
+
+describe('SplitTest', function () {
+  beforeEach(async function () {
+    this.res = {
+      send: obj => {
+        this.sent = obj
+      },
+      status: status => {
+        this.sentStatus = status
+        return this.res
+      },
+    }
+    this.sent = undefined
+    const UserPromises = User.promises
+    this.adminUser = new UserPromises({ email: 'admin@example.com' })
+    await this.adminUser.ensureUserExists()
+    await this.adminUser.ensureAdmin()
+    await this.adminUser.login()
+
+    this.sendAdminRequest = async function ({ method, path, payload }) {
+      return this.adminUser.doRequest(method, {
+        uri: path,
+        json: payload,
+      })
+    }
+    this.expectResponse = async function (
+      { method, path, payload },
+      { status, body, excluding, excludingEvery }
+    ) {
+      const result = await this.sendAdminRequest({ method, path, payload })
+
+      assert.equal(result.response.statusCode, status)
+      if (body) {
+        if (excludingEvery) {
+          assert.deepEqualExcludingEvery(result.body, body, excludingEvery)
+        } else if (excluding) {
+          assert.deepEqualExcludingEvery(result.body, body, excluding)
+        } else {
+          assert.deepEqual(result.body, body)
+        }
+      }
+    }
+  })
+
+  describe('Manage split test lifecycle', function () {
+    it('Create, update and revert', async function () {
+      const config = {
+        name: 'split-test-1',
+        configuration: {
+          active: true,
+          phase: 'alpha',
+          variants: [
+            {
+              name: 'variant-1',
+              active: true,
+              rolloutPercent: 10,
+            },
+          ],
+        },
+      }
+
+      const version1 = {
+        versionNumber: 1,
+        phase: 'alpha',
+        active: true,
+        variants: [
+          {
+            name: 'variant-1',
+            active: true,
+            rolloutPercent: 10,
+            rolloutStripes: [
+              {
+                start: 0,
+                end: 10,
+              },
+            ],
+          },
+        ],
+      }
+
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/createSplitTest',
+          payload: config,
+        },
+        {
+          status: 200,
+          body: {
+            name: 'split-test-1',
+            versions: [version1],
+          },
+          excludingEvery: ['_id', '__v'],
+        }
+      )
+
+      config.configuration.variants[0].rolloutPercent = 20
+      config.configuration.variants.push({
+        name: 'variant-2',
+        active: true,
+        rolloutPercent: 5,
+      })
+
+      const version2 = {
+        versionNumber: 2,
+        phase: 'alpha',
+        active: true,
+        variants: [
+          {
+            name: 'variant-1',
+            active: true,
+            rolloutPercent: 20,
+            rolloutStripes: [
+              {
+                start: 0,
+                end: 10,
+              },
+              {
+                start: 10,
+                end: 20,
+              },
+            ],
+          },
+          {
+            name: 'variant-2',
+            active: true,
+            rolloutPercent: 5,
+            rolloutStripes: [
+              {
+                start: 20,
+                end: 25,
+              },
+            ],
+          },
+        ],
+      }
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/updateSplitTest',
+          payload: config,
+        },
+        {
+          status: 200,
+          body: {
+            name: 'split-test-1',
+            versions: [version1, version2],
+          },
+          excludingEvery: ['_id', '__v'],
+        }
+      )
+
+      config.configuration.active = false
+      config.configuration.variants[0].active = false
+      config.configuration.variants[0].rolloutPercent = 30
+      config.configuration.variants[1].rolloutPercent = 30
+
+      const version3 = {
+        versionNumber: 3,
+        phase: 'alpha',
+        active: false,
+        variants: [
+          {
+            name: 'variant-1',
+            active: false,
+            rolloutPercent: 30,
+            rolloutStripes: [
+              {
+                start: 0,
+                end: 10,
+              },
+              {
+                start: 10,
+                end: 20,
+              },
+              {
+                start: 25,
+                end: 35,
+              },
+            ],
+          },
+          {
+            name: 'variant-2',
+            active: true,
+            rolloutPercent: 30,
+            rolloutStripes: [
+              {
+                start: 20,
+                end: 25,
+              },
+              {
+                start: 35,
+                end: 60,
+              },
+            ],
+          },
+        ],
+      }
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/updateSplitTest',
+          payload: config,
+        },
+        {
+          status: 200,
+          body: {
+            name: 'split-test-1',
+            versions: [version1, version2, version3],
+          },
+          excludingEvery: ['_id', '__v'],
+        }
+      )
+
+      const version4 = {
+        versionNumber: 4,
+        phase: 'alpha',
+        active: true,
+        variants: [
+          {
+            name: 'variant-1',
+            active: true,
+            rolloutPercent: 20,
+            rolloutStripes: [
+              {
+                start: 0,
+                end: 10,
+              },
+              {
+                start: 10,
+                end: 20,
+              },
+            ],
+          },
+          {
+            name: 'variant-2',
+            active: true,
+            rolloutPercent: 5,
+            rolloutStripes: [
+              {
+                start: 20,
+                end: 25,
+              },
+            ],
+          },
+        ],
+      }
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/splitTest/revertToPreviousVersion',
+          payload: {
+            name: 'split-test-1',
+            versionNumber: 2,
+          },
+        },
+        {
+          status: 200,
+          body: {
+            name: 'split-test-1',
+            versions: [version1, version2, version3, version4],
+          },
+          excludingEvery: ['_id', '__v'],
+        }
+      )
+    })
+
+    it('Switch to next phase', async function () {
+      const version1 = {
+        versionNumber: 1,
+        phase: 'alpha',
+        active: true,
+        variants: [
+          {
+            name: 'variant-1',
+            active: true,
+            rolloutPercent: 50,
+            rolloutStripes: [
+              {
+                start: 0,
+                end: 50,
+              },
+            ],
+          },
+          {
+            name: 'variant-2',
+            active: true,
+            rolloutPercent: 50,
+            rolloutStripes: [
+              {
+                start: 50,
+                end: 100,
+              },
+            ],
+          },
+        ],
+      }
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/createSplitTest',
+          payload: {
+            name: 'split-test-3',
+            configuration: {
+              active: true,
+              phase: 'alpha',
+              variants: [
+                {
+                  name: 'variant-1',
+                  rolloutPercent: 50,
+                  active: true,
+                },
+                {
+                  name: 'variant-2',
+                  rolloutPercent: 50,
+                  active: true,
+                },
+              ],
+            },
+          },
+        },
+        {
+          status: 200,
+          body: {
+            name: 'split-test-3',
+            versions: [version1],
+          },
+          excluding: ['_id', '__v'],
+        }
+      )
+
+      const version2 = {
+        versionNumber: 2,
+        phase: 'beta',
+        active: true,
+        variants: [
+          {
+            name: 'variant-1',
+            active: true,
+            rolloutPercent: 0,
+            rolloutStripes: [],
+          },
+          {
+            name: 'variant-2',
+            active: true,
+            rolloutPercent: 0,
+            rolloutStripes: [],
+          },
+        ],
+      }
+
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/splitTest/switchToNextPhase',
+          payload: {
+            name: 'split-test-3',
+          },
+        },
+        {
+          status: 200,
+          body: {
+            name: 'split-test-3',
+            versions: [version1, version2],
+          },
+          excludingEvery: ['_id', '__v'],
+        }
+      )
+
+      const version3 = {
+        versionNumber: 3,
+        phase: 'release',
+        active: true,
+        variants: [
+          {
+            name: 'variant-1',
+            active: true,
+            rolloutPercent: 0,
+            rolloutStripes: [],
+          },
+          {
+            name: 'variant-2',
+            active: true,
+            rolloutPercent: 0,
+            rolloutStripes: [],
+          },
+        ],
+      }
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/splitTest/switchToNextPhase',
+          payload: {
+            name: 'split-test-3',
+          },
+        },
+        {
+          status: 200,
+          body: {
+            name: 'split-test-3',
+            versions: [version1, version2, version3],
+          },
+          excludingEvery: ['_id', '__v'],
+        }
+      )
+    })
+
+    it('Error - update with different rollout phase is not allowed', async function () {
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/createSplitTest',
+          payload: {
+            name: 'split-test-2',
+            configuration: {
+              active: true,
+              phase: 'alpha',
+              variants: [],
+            },
+          },
+        },
+        {
+          status: 200,
+          body: {
+            name: 'split-test-2',
+            versions: [
+              {
+                versionNumber: 1,
+                phase: 'alpha',
+                active: true,
+                variants: [],
+              },
+            ],
+          },
+          excludingEvery: ['_id', '__v'],
+        }
+      )
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/updateSplitTest',
+          payload: {
+            name: 'split-test-2',
+            configuration: {
+              active: true,
+              phase: 'beta',
+              variants: [],
+            },
+          },
+        },
+        {
+          status: 500,
+          body: {
+            error:
+              'Error while updating split test: Cannot update with different phase - use switchToNextPhase endpoint instead',
+          },
+        }
+      )
+    })
+
+    it('Error - update with non existing name', async function () {
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/updateSplitTest',
+          payload: {
+            name: 'does-not-exist',
+            configuration: {
+              active: true,
+              phase: 'beta',
+              variants: [
+                {
+                  name: 'foo',
+                  active: true,
+                  rolloutPercent: 50,
+                },
+              ],
+            },
+          },
+        },
+        {
+          status: 500,
+          body: {
+            error:
+              "Error while updating split test: Cannot update split test 'does-not-exist': not found",
+          },
+        }
+      )
+    })
+
+    it('Error - create with missing name in configuration', async function () {
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/createSplitTest',
+          payload: {
+            configuration: {
+              active: true,
+              phase: 'beta',
+              variants: [
+                {
+                  name: 'foo',
+                  active: true,
+                  rolloutPercent: 50,
+                },
+              ],
+            },
+          },
+        },
+        {
+          status: 500,
+          body: {
+            error:
+              'Error while creating split test: SplitTest validation failed: name: Path `name` is required.',
+          },
+        }
+      )
+    })
+
+    it('Error - missing variants in configuration', async function () {
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/createSplitTest',
+          payload: {
+            name: 'split-test-1',
+            configuration: {},
+          },
+        },
+        {
+          status: 500,
+          body: {
+            error:
+              'Error while creating split test: configuration.variants is not iterable',
+          },
+        }
+      )
+    })
+
+    it('Error - create with total rollout percent exceeding 100', async function () {
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/createSplitTest',
+          payload: {
+            name: 'split-test-1',
+            configuration: {
+              active: true,
+              phase: 'alpha',
+              variants: [
+                {
+                  name: 'variant-1',
+                  active: true,
+                  rolloutPercent: 51,
+                },
+                {
+                  name: 'variant-2',
+                  active: true,
+                  rolloutPercent: 50,
+                },
+              ],
+            },
+          },
+        },
+        {
+          status: 500,
+          body: {
+            error:
+              'Error while creating split test: Total variants rollout percentage cannot exceed 100',
+          },
+        }
+      )
+    })
+
+    it('Error - create with empty split test name', async function () {
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/createSplitTest',
+          payload: {
+            name: '',
+            configuration: {
+              active: true,
+              phase: 'alpha',
+              variants: [
+                {
+                  name: 'variant-1',
+                  active: true,
+                  rolloutPercent: 50,
+                },
+              ],
+            },
+          },
+        },
+        {
+          status: 500,
+          body: {
+            error:
+              'Error while creating split test: SplitTest validation failed: name: Path `name` is required.',
+          },
+        }
+      )
+    })
+
+    it('Error - create with empty variant name', async function () {
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/createSplitTest',
+          payload: {
+            name: 'split-test-7',
+            configuration: {
+              active: true,
+              phase: 'alpha',
+              variants: [
+                {
+                  name: '',
+                  active: true,
+                  rolloutPercent: 50,
+                },
+              ],
+            },
+          },
+        },
+        {
+          status: 500,
+          body: {
+            error:
+              'Error while creating split test: SplitTest validation failed: versions.0.variants.0.name: Path `name` is required.',
+          },
+        }
+      )
+    })
+
+    it('Error - cannot switch to release phase after revert to beta', async function () {
+      const version1 = {
+        versionNumber: 1,
+        phase: 'alpha',
+        active: true,
+        variants: [],
+      }
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/createSplitTest',
+          payload: {
+            name: 'split-test-8',
+            configuration: {
+              active: true,
+              phase: 'alpha',
+              variants: [],
+            },
+          },
+        },
+        {
+          status: 200,
+          body: {
+            name: 'split-test-8',
+            versions: [version1],
+          },
+          excludingEvery: ['__v', '_id'],
+        }
+      )
+
+      const version2 = {
+        versionNumber: 2,
+        phase: 'beta',
+        active: true,
+        variants: [],
+      }
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/splitTest/switchToNextPhase',
+          payload: {
+            name: 'split-test-8',
+          },
+        },
+        {
+          status: 200,
+          body: {
+            name: 'split-test-8',
+            versions: [version1, version2],
+          },
+          excludingEvery: ['__v', '_id'],
+        }
+      )
+
+      const version3 = {
+        versionNumber: 3,
+        phase: 'release',
+        active: true,
+        variants: [],
+      }
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/splitTest/switchToNextPhase',
+          payload: {
+            name: 'split-test-8',
+          },
+        },
+        {
+          status: 200,
+          body: {
+            name: 'split-test-8',
+            versions: [version1, version2, version3],
+          },
+          excludingEvery: ['__v', '_id'],
+        }
+      )
+
+      const version4 = {
+        versionNumber: 4,
+        phase: 'beta',
+        active: true,
+        variants: [],
+      }
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/splitTest/revertToPreviousVersion',
+          payload: {
+            name: 'split-test-8',
+            versionNumber: 2,
+          },
+        },
+        {
+          status: 200,
+          body: {
+            name: 'split-test-8',
+            forbidReleasePhase: true,
+            versions: [version1, version2, version3, version4],
+          },
+          excludingEvery: ['__v', '_id'],
+        }
+      )
+
+      await this.expectResponse(
+        {
+          method: 'POST',
+          path: '/admin/splitTest/switchToNextPhase',
+          payload: {
+            name: 'split-test-8',
+          },
+        },
+        {
+          status: 500,
+          body: {
+            error:
+              'Error while switching split test to next phase: Switch to release phase is disabled for this test',
+          },
+        }
+      )
+    })
+  })
+
+  describe('Assign users to variants', async function () {
+    it('Assign to default variant when test is inactive', async function () {
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/createSplitTest',
+        payload: {
+          name: 'user-test-inactive',
+          configuration: {
+            active: false,
+            phase: 'release',
+            variants: [
+              {
+                name: 'variant-1',
+                active: true,
+                rolloutPercent: 100,
+              },
+            ],
+          },
+        },
+      })
+
+      const user = await createUserWithId('foobarbazcar', { alpha: true })
+      const assignment = await SplitTestV2Handler.promises.getAssignment(
+        user._id,
+        'user-test-inactive'
+      )
+      assert.deepEqual(assignment, {
+        variant: 'default',
+        analytics: {
+          segmentation: {},
+        },
+      })
+    })
+
+    it('Assign to correct variant when active for alpha/non-alpha user', async function () {
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/createSplitTest',
+        payload: {
+          name: 'user-test-1',
+          configuration: {
+            active: true,
+            phase: 'alpha',
+            variants: [
+              {
+                name: 'variant-1',
+                active: true,
+                rolloutPercent: 30,
+              },
+            ],
+          },
+        },
+      })
+
+      const user1 = await createUserWithId('abc123abc123', { alpha: true })
+      const assignment1 = await SplitTestV2Handler.promises.getAssignment(
+        user1._id,
+        'user-test-1'
+      ) // percentile: 24
+      assert.deepEqual(assignment1, {
+        variant: 'variant-1',
+        analytics: {
+          segmentation: {
+            splitTest: 'user-test-1',
+            phase: 'alpha',
+            versionNumber: 1,
+            variant: 'variant-1',
+          },
+        },
+      })
+
+      const user2 = await createUserWithId('xxx123abc123', {
+        alpha: false,
+        beta: true,
+      })
+      const assignment2 = await SplitTestV2Handler.promises.getAssignment(
+        user2._id,
+        'user-test-1'
+      ) // percentile: 70
+      assert.deepEqual(assignment2, {
+        variant: 'default',
+        analytics: {
+          segmentation: {},
+        },
+      })
+    })
+
+    it('Assign to correct variant when active for beta user', async function () {
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/createSplitTest',
+        payload: {
+          name: 'user-test-2',
+          configuration: {
+            active: true,
+            phase: 'beta',
+            variants: [
+              {
+                name: 'variant-1',
+                active: true,
+                rolloutPercent: 30,
+              },
+            ],
+          },
+        },
+      })
+
+      const user1 = await createUserWithId('abc123abc123', { beta: true })
+      const assignment1 = await SplitTestV2Handler.promises.getAssignment(
+        user1._id,
+        'user-test-2'
+      ) // percentile: 62
+      assert.deepEqual(assignment1, {
+        variant: 'default',
+        analytics: {
+          segmentation: {
+            splitTest: 'user-test-2',
+            phase: 'beta',
+            versionNumber: 1,
+            variant: 'default',
+          },
+        },
+      })
+
+      const user2 = await createUserWithId('abc234abc234', { beta: false })
+      const assignment2 = await SplitTestV2Handler.promises.getAssignment(
+        user2._id,
+        'user-test-2'
+      ) // percentile: 34
+      assert.deepEqual(assignment2, {
+        variant: 'default',
+        analytics: {
+          segmentation: {},
+        },
+      })
+    })
+
+    it('Assign to correct variant when active in release phase', async function () {
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/createSplitTest',
+        payload: {
+          name: 'user-test-3',
+          configuration: {
+            active: true,
+            phase: 'release',
+            variants: [
+              {
+                name: 'variant-1',
+                active: true,
+                rolloutPercent: 50,
+              },
+            ],
+          },
+        },
+      })
+
+      const user1 = await createUserWithId('abc123abc123')
+      const assignment1 = await SplitTestV2Handler.promises.getAssignment(
+        user1._id,
+        'user-test-3'
+      ) // percentile: 33
+      assert.deepEqual(assignment1, {
+        variant: 'variant-1',
+        analytics: {
+          segmentation: {
+            splitTest: 'user-test-3',
+            phase: 'release',
+            versionNumber: 1,
+            variant: 'variant-1',
+          },
+        },
+      })
+
+      const user2 = await createUserWithId('abc234abc234')
+      const assignment2 = await SplitTestV2Handler.promises.getAssignment(
+        user2._id,
+        'user-test-3'
+      ) // percentile: 81
+      assert.deepEqual(assignment2, {
+        variant: 'default',
+        analytics: {
+          segmentation: {
+            splitTest: 'user-test-3',
+            phase: 'release',
+            versionNumber: 1,
+            variant: 'default',
+          },
+        },
+      })
+    })
+
+    it('Split test is cached for 1min after update', async function () {
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/createSplitTest',
+        payload: {
+          name: 'user-test-4',
+          configuration: {
+            active: true,
+            phase: 'release',
+            variants: [
+              {
+                name: 'variant-1',
+                active: true,
+                rolloutPercent: 10,
+              },
+            ],
+          },
+        },
+      })
+
+      const user1 = await createUserWithId('abc123abc123')
+      const assignment1 = await SplitTestV2Handler.promises.getAssignment(
+        user1._id,
+        'user-test-4'
+      ) // percentile: 38
+      assert.deepEqual(assignment1, {
+        variant: 'default',
+        analytics: {
+          segmentation: {
+            splitTest: 'user-test-4',
+            phase: 'release',
+            versionNumber: 1,
+            variant: 'default',
+          },
+        },
+      })
+
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/updateSplitTest',
+        payload: {
+          name: 'user-test-4',
+          configuration: {
+            active: true,
+            phase: 'release',
+            variants: [
+              {
+                name: 'variant-1',
+                active: true,
+                rolloutPercent: 100,
+              },
+            ],
+          },
+        },
+      })
+
+      const assignment2 = await SplitTestV2Handler.promises.getAssignment(
+        user1._id,
+        'user-test-4'
+      ) // percentile: 38
+      assert.deepEqual(assignment2, {
+        variant: 'default',
+        analytics: {
+          segmentation: {
+            splitTest: 'user-test-4',
+            phase: 'release',
+            versionNumber: 1,
+            variant: 'default',
+          },
+        },
+      })
+    })
+
+    it('User is reassigned if split test cache is cleared after update', async function () {
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/createSplitTest',
+        payload: {
+          name: 'user-test-5',
+          configuration: {
+            active: true,
+            phase: 'release',
+            variants: [
+              {
+                name: 'variant-1',
+                active: true,
+                rolloutPercent: 10,
+              },
+            ],
+          },
+        },
+      })
+
+      let user1 = await createUserWithId('abc123abc123')
+      const assignment1 = await SplitTestV2Handler.promises.getAssignment(
+        user1._id,
+        'user-test-5',
+        { sync: true }
+      ) // percentile: 84
+      assert.deepEqual(assignment1, {
+        variant: 'default',
+        analytics: {
+          segmentation: {
+            splitTest: 'user-test-5',
+            phase: 'release',
+            versionNumber: 1,
+            variant: 'default',
+          },
+        },
+      })
+      user1 = await getUser('abc123abc123')
+      assert.deepEqualExcludingEvery(
+        user1.splitTests,
+        {
+          'user-test-5': [
+            {
+              variantName: 'default',
+              versionNumber: 1,
+              phase: 'release',
+            },
+          ],
+        },
+        ['assignedAt']
+      )
+
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/updateSplitTest',
+        payload: {
+          name: 'user-test-5',
+          configuration: {
+            active: true,
+            phase: 'release',
+            variants: [
+              {
+                name: 'variant-1',
+                active: true,
+                rolloutPercent: 100,
+              },
+            ],
+          },
+        },
+      })
+
+      await CacheFlow.reset('split-test')
+
+      const assignment2 = await SplitTestV2Handler.promises.getAssignment(
+        user1._id,
+        'user-test-5',
+        { sync: true }
+      ) // percentile: 84
+      assert.deepEqual(assignment2, {
+        variant: 'variant-1',
+        analytics: {
+          segmentation: {
+            splitTest: 'user-test-5',
+            phase: 'release',
+            versionNumber: 2,
+            variant: 'variant-1',
+          },
+        },
+      })
+      user1 = await getUser('abc123abc123')
+      assert.deepEqualExcludingEvery(
+        user1.splitTests,
+        {
+          'user-test-5': [
+            {
+              variantName: 'default',
+              versionNumber: 1,
+              phase: 'release',
+            },
+            {
+              variantName: 'variant-1',
+              versionNumber: 2,
+              phase: 'release',
+            },
+          ],
+        },
+        ['assignedAt']
+      )
+    })
+
+    it('User is reassigned from control to striped variant after update, and reverted to control', async function () {
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/createSplitTest',
+        payload: {
+          name: 'user-test-6',
+          configuration: {
+            active: true,
+            phase: 'alpha',
+            variants: [
+              {
+                name: 'variant-1',
+                active: true,
+                rolloutPercent: 10,
+              },
+              {
+                name: 'variant-2',
+                active: true,
+                rolloutPercent: 10,
+              },
+            ],
+          },
+        },
+      })
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/splitTest/switchToNextPhase',
+        payload: {
+          name: 'user-test-6',
+        },
+      })
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/splitTest/switchToNextPhase',
+        payload: {
+          name: 'user-test-6',
+        },
+      })
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/updateSplitTest',
+        payload: {
+          name: 'user-test-6',
+          configuration: {
+            active: true,
+            phase: 'release',
+            variants: [
+              {
+                name: 'variant-1',
+                active: true,
+                rolloutPercent: 10,
+              },
+              {
+                name: 'variant-2',
+                active: true,
+                rolloutPercent: 10,
+              },
+            ],
+          },
+        },
+      })
+
+      let user1 = await createUserWithId('abc123abc123')
+      const assignment1 = await SplitTestV2Handler.promises.getAssignment(
+        user1._id,
+        'user-test-6',
+        { sync: true }
+      ) // percentile: 47
+      assert.deepEqual(assignment1, {
+        variant: 'default',
+        analytics: {
+          segmentation: {
+            splitTest: 'user-test-6',
+            phase: 'release',
+            versionNumber: 4,
+            variant: 'default',
+          },
+        },
+      })
+      user1 = await getUser('abc123abc123')
+      assert.deepEqualExcludingEvery(
+        user1.splitTests,
+        {
+          'user-test-6': [
+            {
+              variantName: 'default',
+              versionNumber: 4,
+              phase: 'release',
+            },
+          ],
+        },
+        ['assignedAt']
+      )
+
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/updateSplitTest',
+        payload: {
+          name: 'user-test-6',
+          configuration: {
+            active: true,
+            phase: 'release',
+            variants: [
+              {
+                name: 'variant-1',
+                active: true,
+                rolloutPercent: 40,
+              },
+              {
+                name: 'variant-2',
+                active: true,
+                rolloutPercent: 40,
+              },
+            ],
+          },
+        },
+      })
+      await CacheFlow.reset('split-test')
+
+      const assignment2 = await SplitTestV2Handler.promises.getAssignment(
+        user1._id,
+        'user-test-6',
+        { sync: true }
+      ) // percentile: 47
+      assert.deepEqual(assignment2, {
+        variant: 'variant-1',
+        analytics: {
+          segmentation: {
+            splitTest: 'user-test-6',
+            phase: 'release',
+            versionNumber: 5,
+            variant: 'variant-1',
+          },
+        },
+      })
+      user1 = await getUser('abc123abc123')
+      assert.deepEqualExcludingEvery(
+        user1.splitTests,
+        {
+          'user-test-6': [
+            {
+              variantName: 'default',
+              versionNumber: 4,
+              phase: 'release',
+            },
+            {
+              variantName: 'variant-1',
+              versionNumber: 5,
+              phase: 'release',
+            },
+          ],
+        },
+        ['assignedAt']
+      )
+
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/splitTest/revertToPreviousVersion',
+        payload: {
+          name: 'user-test-6',
+          versionNumber: 4,
+        },
+      })
+      await CacheFlow.reset('split-test')
+
+      const assignment3 = await SplitTestV2Handler.promises.getAssignment(
+        user1._id,
+        'user-test-6',
+        { sync: true }
+      ) // percentile: 47
+      assert.deepEqual(assignment3, {
+        variant: 'default',
+        analytics: {
+          segmentation: {
+            splitTest: 'user-test-6',
+            phase: 'release',
+            versionNumber: 6,
+            variant: 'default',
+          },
+        },
+      })
+      user1 = await getUser('abc123abc123')
+      assert.deepEqualExcludingEvery(
+        user1.splitTests,
+        {
+          'user-test-6': [
+            {
+              variantName: 'default',
+              versionNumber: 4,
+              phase: 'release',
+            },
+            {
+              variantName: 'variant-1',
+              versionNumber: 5,
+              phase: 'release',
+            },
+            {
+              variantName: 'default',
+              versionNumber: 6,
+              phase: 'release',
+            },
+          ],
+        },
+        ['assignedAt']
+      )
+
+      await this.sendAdminRequest({
+        method: 'POST',
+        path: '/admin/splitTest/revertToPreviousVersion',
+        payload: {
+          name: 'user-test-6',
+          versionNumber: 2,
+        },
+      })
+      await CacheFlow.reset('split-test')
+      const assignment4 = await SplitTestV2Handler.promises.getAssignment(
+        user1._id,
+        'user-test-6',
+        { sync: true }
+      ) // percentile: 47
+      assert.deepEqual(assignment4, {
+        variant: 'default',
+        analytics: {
+          segmentation: {},
+        },
+      })
+      user1 = await getUser('abc123abc123')
+      assert.deepEqualExcludingEvery(
+        user1.splitTests,
+        {
+          'user-test-6': [
+            {
+              variantName: 'default',
+              versionNumber: 4,
+              phase: 'release',
+            },
+            {
+              variantName: 'variant-1',
+              versionNumber: 5,
+              phase: 'release',
+            },
+            {
+              variantName: 'default',
+              versionNumber: 6,
+              phase: 'release',
+            },
+          ],
+        },
+        ['assignedAt']
+      )
+    })
+  })
+})
+
+async function createUserWithId(id, { alpha = false, beta = false } = {}) {
+  const newUser = new User()
+  const user = await promisify(newUser.register).bind(newUser)()
+  await db.users.remove({ _id: user._id })
+  user._id = ObjectId(id)
+  user.alphaProgram = alpha
+  user.betaProgram = beta
+  await db.users.insert(user)
+  return db.users.findOne(
+    { _id: ObjectId(id) },
+    { splitTests: 1, alphaProgram: 1, betaProgram: 1 }
+  )
+}
+
+async function getUser(id) {
+  return db.users.findOne(
+    { _id: ObjectId(id) },
+    { splitTests: 1, alphaProgram: 1, betaProgram: 1 }
+  )
+}