From fefa4ec3912a4efce7b2e7ef20375861c5be725c Mon Sep 17 00:00:00 2001
From: Jessica Lawshe <jessica.lawshe@overleaf.com>
Date: Wed, 9 Jun 2021 08:44:05 -0500
Subject: [PATCH] Merge pull request #4136 from overleaf/jel-add-gallery-bundle

Add JS bundle for gallery and begin Algolia/React gallery search migration

GitOrigin-RevId: ddce48df9108b4880b39e522c30617fd1a7c0a87
---
 .../app/src/Features/Helpers/FeatureFlag.js   |  9 ++++
 .../unit/src/HelperFiles/FeatureFlagTests.js  | 52 +++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 services/web/app/src/Features/Helpers/FeatureFlag.js
 create mode 100644 services/web/test/unit/src/HelperFiles/FeatureFlagTests.js

diff --git a/services/web/app/src/Features/Helpers/FeatureFlag.js b/services/web/app/src/Features/Helpers/FeatureFlag.js
new file mode 100644
index 0000000000..44f0b812aa
--- /dev/null
+++ b/services/web/app/src/Features/Helpers/FeatureFlag.js
@@ -0,0 +1,9 @@
+function shouldDisplayFeature(req, name, variantFlag) {
+  if (req.query && req.query[name]) {
+    return req.query[name] === 'true'
+  } else {
+    return variantFlag === true
+  }
+}
+
+module.exports = { shouldDisplayFeature }
diff --git a/services/web/test/unit/src/HelperFiles/FeatureFlagTests.js b/services/web/test/unit/src/HelperFiles/FeatureFlagTests.js
new file mode 100644
index 0000000000..bb31a5afab
--- /dev/null
+++ b/services/web/test/unit/src/HelperFiles/FeatureFlagTests.js
@@ -0,0 +1,52 @@
+const { expect } = require('chai')
+const SandboxedModule = require('sandboxed-module')
+const modulePath = require('path').join(
+  __dirname,
+  '../../../../app/src/Features/Helpers/FeatureFlag'
+)
+
+describe('FeatureFlag', function () {
+  beforeEach(function () {
+    this.FeatureFlag = SandboxedModule.require(modulePath, {})
+  })
+
+  describe('shouldDisplayFeature', function () {
+    describe('no req.query', function () {
+      const req = {}
+      it('should return false when variantFlag=false', function () {
+        expect(this.FeatureFlag.shouldDisplayFeature(req, '', false)).to.be
+          .false
+      })
+      it('should return true when variantFlag=true', function () {
+        expect(this.FeatureFlag.shouldDisplayFeature(req, '', true)).to.be.true
+      })
+    })
+
+    describe('req.query but no query param', function () {
+      const req = { query: {} }
+      it('should return false when variantFlag=false', function () {
+        expect(this.FeatureFlag.shouldDisplayFeature(req, '', false)).to.be
+          .false
+      })
+      it('should return true when variantFlag=true', function () {
+        expect(this.FeatureFlag.shouldDisplayFeature(req, '', true)).to.be.true
+      })
+    })
+
+    describe('req.query[name] exists', function () {
+      const paramName = 'test'
+      const req = { query: {} }
+
+      it('should return false when value is not "true"', function () {
+        req.query[paramName] = 'nope'
+        expect(this.FeatureFlag.shouldDisplayFeature(req, paramName, false)).to
+          .be.false
+      })
+      it('should return true when value is "true"', function () {
+        req.query[paramName] = 'true'
+        expect(this.FeatureFlag.shouldDisplayFeature(req, paramName, false)).to
+          .be.true
+      })
+    })
+  })
+})