diff --git a/services/real-time/.mocharc.json b/services/real-time/.mocharc.json
new file mode 100644
index 0000000000..dc3280aa96
--- /dev/null
+++ b/services/real-time/.mocharc.json
@@ -0,0 +1,3 @@
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+}
diff --git a/services/real-time/package-lock.json b/services/real-time/package-lock.json
index ac3e97ade9..4ba3fdc753 100644
--- a/services/real-time/package-lock.json
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@@ -5367,6 +5815,15 @@
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-        "type-detect": {
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-          "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
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@@ -5607,12 +6056,12 @@
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+      "integrity": "sha1-7YuyVkjhWDF1m2Ajvbh+a2CzgSY="
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       "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
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+      "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
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@@ -5786,12 +6235,6 @@
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@@ -5801,7 +6244,7 @@
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+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU="
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@@ -5819,7 +6262,7 @@
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@@ -5841,6 +6284,15 @@
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       "integrity": "sha1-xyKQcWTvaxeBMsjmmTAhLRtKoWo="
     },
+    "to-regex-range": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
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+      "dev": true,
+      "requires": {
+        "is-number": "^7.0.0"
+      }
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@@ -5891,7 +6343,7 @@
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+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
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@@ -5899,7 +6351,7 @@
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+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q="
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@@ -5913,7 +6365,7 @@
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+      "integrity": "sha1-C6XsKohWQORw6k6FBZcZANrFiCI=",
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@@ -5973,7 +6425,7 @@
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+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
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@@ -5986,12 +6438,12 @@
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+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
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       "version": "1.0.1",
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-      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA=="
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
     },
     "uuid": {
       "version": "7.0.3",
@@ -6017,12 +6469,12 @@
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-      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg=="
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
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+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
       "requires": {
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@@ -6166,6 +6618,12 @@
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       "dev": true
     },
+    "workerpool": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.1.0.tgz",
+      "integrity": "sha512-toV7q9rWNYha963Pl/qyeZ6wG+3nnsyvolaNUS8+R5Wtw6qJPTxIlOP1ZSvcGhEJw+l3HMMmtiNo9Gl61G4GVg==",
+      "dev": true
+    },
     "wrap-ansi": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
@@ -6205,7 +6663,7 @@
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       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
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+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "write": {
       "version": "1.0.3",
@@ -6331,6 +6789,32 @@
         "decamelize": "^1.2.0"
       }
     },
+    "yargs-unparser": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-2.0.0.tgz",
+      "integrity": "sha512-7pRTIA9Qc1caZ0bZ6RYRGbHJthJWuakf+WmHK0rVeLkNrrGhfoabBNdue6kdINI6r4if7ocq9aD/n7xwKOdzOA==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^6.0.0",
+        "decamelize": "^4.0.0",
+        "flat": "^5.0.2",
+        "is-plain-obj": "^2.1.0"
+      },
+      "dependencies": {
+        "camelcase": {
+          "version": "6.2.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-6.2.0.tgz",
+          "integrity": "sha512-c7wVvbw3f37nuobQNtgsgG9POC9qMbNuMQmTCqZv23b6MIz0fcYpBiOlv9gEN/hdLdnZTDQhg6e9Dq5M1vKvfg==",
+          "dev": true
+        },
+        "decamelize": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-4.0.0.tgz",
+          "integrity": "sha512-9iE1PgSik9HeIIw2JO94IidnE3eBoQrFJ3w7sFuzSX4DpmZ3v5sZpUiV5Swcf6mQEF+Y0ru8Neo+p+nyh2J+hQ==",
+          "dev": true
+        }
+      }
+    },
     "yn": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
diff --git a/services/real-time/package.json b/services/real-time/package.json
index 3a2145a85e..51ee7a1a0e 100644
--- a/services/real-time/package.json
+++ b/services/real-time/package.json
@@ -54,11 +54,11 @@
     "eslint-plugin-prettier": "^3.1.2",
     "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-standard": "^4.0.1",
-    "mocha": "^4.0.1",
+    "mocha": "^8.3.2",
     "prettier": "^2.0.0",
     "prettier-eslint-cli": "^5.0.0",
     "sandboxed-module": "~0.3.0",
-    "sinon": "^2.4.1",
+    "sinon": "^9.2.4",
     "timekeeper": "0.0.4",
     "uid-safe": "^2.1.5"
   }
diff --git a/services/real-time/test/acceptance/js/ApplyUpdateTests.js b/services/real-time/test/acceptance/js/ApplyUpdateTests.js
index 27f77b973f..14a8faa186 100644
--- a/services/real-time/test/acceptance/js/ApplyUpdateTests.js
+++ b/services/real-time/test/acceptance/js/ApplyUpdateTests.js
@@ -13,9 +13,7 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const async = require('async')
-const chai = require('chai')
-const { expect } = chai
-chai.should()
+const { expect } = require('chai')
 
 const RealTimeClient = require('./helpers/RealTimeClient')
 const FixturesManager = require('./helpers/FixturesManager')
diff --git a/services/real-time/test/acceptance/js/ClientTrackingTests.js b/services/real-time/test/acceptance/js/ClientTrackingTests.js
index 079baadb58..702b2288ab 100644
--- a/services/real-time/test/acceptance/js/ClientTrackingTests.js
+++ b/services/real-time/test/acceptance/js/ClientTrackingTests.js
@@ -12,9 +12,7 @@
  * DS207: Consider shorter variations of null checks
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const chai = require('chai')
-const { expect } = chai
-chai.should()
+const { expect } = require('chai')
 
 const RealTimeClient = require('./helpers/RealTimeClient')
 const MockWebServer = require('./helpers/MockWebServer')
diff --git a/services/real-time/test/acceptance/js/JoinDocTests.js b/services/real-time/test/acceptance/js/JoinDocTests.js
index 217731a1df..936b8c8e04 100644
--- a/services/real-time/test/acceptance/js/JoinDocTests.js
+++ b/services/real-time/test/acceptance/js/JoinDocTests.js
@@ -11,9 +11,7 @@
  * DS102: Remove unnecessary code created because of implicit returns
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const chai = require('chai')
-const { expect } = chai
-chai.should()
+const { expect } = require('chai')
 
 const RealTimeClient = require('./helpers/RealTimeClient')
 const MockDocUpdaterServer = require('./helpers/MockDocUpdaterServer')
diff --git a/services/real-time/test/acceptance/js/JoinProjectTests.js b/services/real-time/test/acceptance/js/JoinProjectTests.js
index 508e2b6614..61ede26f87 100644
--- a/services/real-time/test/acceptance/js/JoinProjectTests.js
+++ b/services/real-time/test/acceptance/js/JoinProjectTests.js
@@ -10,9 +10,7 @@
  * DS102: Remove unnecessary code created because of implicit returns
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const chai = require('chai')
-const { expect } = chai
-chai.should()
+const { expect } = require('chai')
 
 const RealTimeClient = require('./helpers/RealTimeClient')
 const MockWebServer = require('./helpers/MockWebServer')
diff --git a/services/real-time/test/acceptance/js/LeaveDocTests.js b/services/real-time/test/acceptance/js/LeaveDocTests.js
index a842087522..fc77da6314 100644
--- a/services/real-time/test/acceptance/js/LeaveDocTests.js
+++ b/services/real-time/test/acceptance/js/LeaveDocTests.js
@@ -13,9 +13,7 @@
  * DS207: Consider shorter variations of null checks
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const chai = require('chai')
-const { expect } = chai
-chai.should()
+const { expect } = require('chai')
 const sinon = require('sinon')
 
 const RealTimeClient = require('./helpers/RealTimeClient')
diff --git a/services/real-time/test/acceptance/js/MatrixTests.js b/services/real-time/test/acceptance/js/MatrixTests.js
index 2f4b362bca..9da735083e 100644
--- a/services/real-time/test/acceptance/js/MatrixTests.js
+++ b/services/real-time/test/acceptance/js/MatrixTests.js
@@ -47,8 +47,7 @@ There is additional meta-data that UserItems and SessionItems may use to skip
 /* eslint-disable
     camelcase,
 */
-const chai = require('chai')
-const { expect } = chai
+const { expect } = require('chai')
 const async = require('async')
 
 const RealTimeClient = require('./helpers/RealTimeClient')
diff --git a/services/real-time/test/acceptance/js/ReceiveUpdateTests.js b/services/real-time/test/acceptance/js/ReceiveUpdateTests.js
index 75d3991fc3..ae7ab8ef55 100644
--- a/services/real-time/test/acceptance/js/ReceiveUpdateTests.js
+++ b/services/real-time/test/acceptance/js/ReceiveUpdateTests.js
@@ -11,9 +11,7 @@
  * DS207: Consider shorter variations of null checks
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const chai = require('chai')
-const { expect } = chai
-chai.should()
+const { expect } = require('chai')
 
 const RealTimeClient = require('./helpers/RealTimeClient')
 const MockWebServer = require('./helpers/MockWebServer')
diff --git a/services/real-time/test/acceptance/js/SessionTests.js b/services/real-time/test/acceptance/js/SessionTests.js
index 941a59f4b9..858a2dd48a 100644
--- a/services/real-time/test/acceptance/js/SessionTests.js
+++ b/services/real-time/test/acceptance/js/SessionTests.js
@@ -11,8 +11,7 @@
  * DS207: Consider shorter variations of null checks
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const chai = require('chai')
-const { expect } = chai
+const { expect } = require('chai')
 
 const RealTimeClient = require('./helpers/RealTimeClient')
 
diff --git a/services/real-time/test/setup.js b/services/real-time/test/setup.js
new file mode 100644
index 0000000000..90f4363c52
--- /dev/null
+++ b/services/real-time/test/setup.js
@@ -0,0 +1,38 @@
+const chai = require('chai')
+const SandboxedModule = require('sandboxed-module')
+const sinon = require('sinon')
+
+// Chai configuration
+chai.should()
+
+// Global stubs
+const sandbox = sinon.createSandbox()
+const stubs = {
+  logger: {
+    debug: sandbox.stub(),
+    log: sandbox.stub(),
+    info: sandbox.stub(),
+    warn: sandbox.stub(),
+    err: sandbox.stub(),
+    error: sandbox.stub()
+  }
+}
+
+// SandboxedModule configuration
+SandboxedModule.configure({
+  requires: {
+    'logger-sharelatex': stubs.logger
+  },
+  globals: { Buffer, JSON, console, process }
+})
+
+// Mocha hooks
+exports.mochaHooks = {
+  beforeEach() {
+    this.logger = stubs.logger
+  },
+
+  afterEach() {
+    sandbox.reset()
+  }
+}
diff --git a/services/real-time/test/unit/js/AuthorizationManagerTests.js b/services/real-time/test/unit/js/AuthorizationManagerTests.js
index 3093017a39..d8a3f7ae66 100644
--- a/services/real-time/test/unit/js/AuthorizationManagerTests.js
+++ b/services/real-time/test/unit/js/AuthorizationManagerTests.js
@@ -9,9 +9,7 @@
  * DS102: Remove unnecessary code created because of implicit returns
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const chai = require('chai')
-chai.should()
-const { expect } = chai
+const { expect } = require('chai')
 const sinon = require('sinon')
 const SandboxedModule = require('sandboxed-module')
 const path = require('path')
diff --git a/services/real-time/test/unit/js/ChannelManagerTests.js b/services/real-time/test/unit/js/ChannelManagerTests.js
index f76a109129..aad5ddbd42 100644
--- a/services/real-time/test/unit/js/ChannelManagerTests.js
+++ b/services/real-time/test/unit/js/ChannelManagerTests.js
@@ -9,9 +9,7 @@
  * DS102: Remove unnecessary code created because of implicit returns
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const chai = require('chai')
-const should = chai.should()
-const { expect } = chai
+const { expect } = require('chai')
 const sinon = require('sinon')
 const modulePath = '../../../app/js/ChannelManager.js'
 const SandboxedModule = require('sandboxed-module')
@@ -26,11 +24,6 @@ describe('ChannelManager', function () {
         '@overleaf/metrics': (this.metrics = {
           inc: sinon.stub(),
           summary: sinon.stub()
-        }),
-        'logger-sharelatex': (this.logger = {
-          log: sinon.stub(),
-          warn: sinon.stub(),
-          error: sinon.stub()
         })
       }
     }))
diff --git a/services/real-time/test/unit/js/ConnectedUsersManagerTests.js b/services/real-time/test/unit/js/ConnectedUsersManagerTests.js
index 6489b20639..a0ab01631e 100644
--- a/services/real-time/test/unit/js/ConnectedUsersManagerTests.js
+++ b/services/real-time/test/unit/js/ConnectedUsersManagerTests.js
@@ -12,7 +12,6 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 
-const should = require('chai').should()
 const SandboxedModule = require('sandboxed-module')
 const assert = require('assert')
 const path = require('path')
@@ -58,7 +57,6 @@ describe('ConnectedUsersManager', function () {
     this.ConnectedUsersManager = SandboxedModule.require(modulePath, {
       requires: {
         'settings-sharelatex': this.settings,
-        'logger-sharelatex': { log() {} },
         '@overleaf/redis-wrapper': {
           createClient: () => {
             return this.rClient
diff --git a/services/real-time/test/unit/js/DocumentUpdaterControllerTests.js b/services/real-time/test/unit/js/DocumentUpdaterControllerTests.js
index 0aabc51de7..8f0be7f87d 100644
--- a/services/real-time/test/unit/js/DocumentUpdaterControllerTests.js
+++ b/services/real-time/test/unit/js/DocumentUpdaterControllerTests.js
@@ -12,7 +12,6 @@
  */
 const SandboxedModule = require('sandboxed-module')
 const sinon = require('sinon')
-require('chai').should()
 const modulePath = require('path').join(
   __dirname,
   '../../../app/js/DocumentUpdaterController'
@@ -29,11 +28,6 @@ describe('DocumentUpdaterController', function () {
     this.RoomEvents = { on: sinon.stub() }
     this.EditorUpdatesController = SandboxedModule.require(modulePath, {
       requires: {
-        'logger-sharelatex': (this.logger = {
-          error: sinon.stub(),
-          log: sinon.stub(),
-          warn: sinon.stub()
-        }),
         'settings-sharelatex': (this.settings = {
           redis: {
             documentupdater: {
diff --git a/services/real-time/test/unit/js/DocumentUpdaterManagerTests.js b/services/real-time/test/unit/js/DocumentUpdaterManagerTests.js
index 2a5fdf530f..94ef11f716 100644
--- a/services/real-time/test/unit/js/DocumentUpdaterManagerTests.js
+++ b/services/real-time/test/unit/js/DocumentUpdaterManagerTests.js
@@ -10,7 +10,6 @@
  * DS102: Remove unnecessary code created because of implicit returns
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-require('chai').should()
 const sinon = require('sinon')
 const SandboxedModule = require('sandboxed-module')
 const path = require('path')
@@ -43,11 +42,6 @@ describe('DocumentUpdaterManager', function () {
     return (this.DocumentUpdaterManager = SandboxedModule.require(modulePath, {
       requires: {
         'settings-sharelatex': this.settings,
-        'logger-sharelatex': (this.logger = {
-          log: sinon.stub(),
-          error: sinon.stub(),
-          warn: sinon.stub()
-        }),
         request: (this.request = {}),
         '@overleaf/redis-wrapper': { createClient: () => this.rclient },
         '@overleaf/metrics': (this.Metrics = {
@@ -56,9 +50,6 @@ describe('DocumentUpdaterManager', function () {
             done() {}
           })
         })
-      },
-      globals: {
-        JSON: (this.JSON = Object.create(JSON))
       }
     }))
   }) // avoid modifying JSON object directly
@@ -325,7 +316,9 @@ describe('DocumentUpdaterManager', function () {
 
     describe('with null byte corruption', function () {
       beforeEach(function () {
-        this.JSON.stringify = () => '["bad bytes! \u0000 <- here"]'
+        this.stringifyStub = sinon
+          .stub(JSON, 'stringify')
+          .callsFake(() => '["bad bytes! \u0000 <- here"]')
         return this.DocumentUpdaterManager.queueChange(
           this.project_id,
           this.doc_id,
@@ -334,6 +327,10 @@ describe('DocumentUpdaterManager', function () {
         )
       })
 
+      afterEach(function () {
+        this.stringifyStub.restore()
+      })
+
       it('should return an error', function () {
         return this.callback
           .calledWithExactly(sinon.match(Error))
diff --git a/services/real-time/test/unit/js/DrainManagerTests.js b/services/real-time/test/unit/js/DrainManagerTests.js
index 7ed7f1e06e..bf8de6a6e9 100644
--- a/services/real-time/test/unit/js/DrainManagerTests.js
+++ b/services/real-time/test/unit/js/DrainManagerTests.js
@@ -9,7 +9,6 @@
  * DS102: Remove unnecessary code created because of implicit returns
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const should = require('chai').should()
 const sinon = require('sinon')
 const SandboxedModule = require('sandboxed-module')
 const path = require('path')
@@ -17,11 +16,7 @@ const modulePath = path.join(__dirname, '../../../app/js/DrainManager')
 
 describe('DrainManager', function () {
   beforeEach(function () {
-    this.DrainManager = SandboxedModule.require(modulePath, {
-      requires: {
-        'logger-sharelatex': (this.logger = { log: sinon.stub() })
-      }
-    })
+    this.DrainManager = SandboxedModule.require(modulePath, {})
     return (this.io = {
       sockets: {
         clients: sinon.stub()
diff --git a/services/real-time/test/unit/js/EventLoggerTests.js b/services/real-time/test/unit/js/EventLoggerTests.js
index c95d65ae2e..340e17184e 100644
--- a/services/real-time/test/unit/js/EventLoggerTests.js
+++ b/services/real-time/test/unit/js/EventLoggerTests.js
@@ -8,7 +8,6 @@
  * DS102: Remove unnecessary code created because of implicit returns
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-require('chai').should()
 const { expect } = require('chai')
 const SandboxedModule = require('sandboxed-module')
 const modulePath = '../../../app/js/EventLogger'
@@ -21,10 +20,6 @@ describe('EventLogger', function () {
     tk.freeze(new Date(this.start))
     this.EventLogger = SandboxedModule.require(modulePath, {
       requires: {
-        'logger-sharelatex': (this.logger = {
-          error: sinon.stub(),
-          warn: sinon.stub()
-        }),
         '@overleaf/metrics': (this.metrics = { inc: sinon.stub() })
       }
     })
diff --git a/services/real-time/test/unit/js/RoomManagerTests.js b/services/real-time/test/unit/js/RoomManagerTests.js
index 84aeb7a868..fd22271469 100644
--- a/services/real-time/test/unit/js/RoomManagerTests.js
+++ b/services/real-time/test/unit/js/RoomManagerTests.js
@@ -10,9 +10,7 @@
  * DS102: Remove unnecessary code created because of implicit returns
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const chai = require('chai')
-const { expect } = chai
-const should = chai.should()
+const { expect } = require('chai')
 const sinon = require('sinon')
 const modulePath = '../../../app/js/RoomManager.js'
 const SandboxedModule = require('sandboxed-module')
@@ -26,11 +24,6 @@ describe('RoomManager', function () {
     this.RoomManager = SandboxedModule.require(modulePath, {
       requires: {
         'settings-sharelatex': (this.settings = {}),
-        'logger-sharelatex': (this.logger = {
-          log: sinon.stub(),
-          warn: sinon.stub(),
-          error: sinon.stub()
-        }),
         '@overleaf/metrics': (this.metrics = { gauge: sinon.stub() })
       }
     })
diff --git a/services/real-time/test/unit/js/SafeJsonParseTest.js b/services/real-time/test/unit/js/SafeJsonParseTest.js
index 51a60dea23..de50bccebb 100644
--- a/services/real-time/test/unit/js/SafeJsonParseTest.js
+++ b/services/real-time/test/unit/js/SafeJsonParseTest.js
@@ -11,11 +11,9 @@
  * DS102: Remove unnecessary code created because of implicit returns
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-require('chai').should()
 const { expect } = require('chai')
 const SandboxedModule = require('sandboxed-module')
 const modulePath = '../../../app/js/SafeJsonParse'
-const sinon = require('sinon')
 
 describe('SafeJsonParse', function () {
   beforeEach(function () {
@@ -23,8 +21,7 @@ describe('SafeJsonParse', function () {
       requires: {
         'settings-sharelatex': (this.Settings = {
           maxUpdateSize: 16 * 1024
-        }),
-        'logger-sharelatex': (this.logger = { error: sinon.stub() })
+        })
       }
     }))
   })
diff --git a/services/real-time/test/unit/js/WebApiManagerTests.js b/services/real-time/test/unit/js/WebApiManagerTests.js
index a366a2e75d..97be3c27f0 100644
--- a/services/real-time/test/unit/js/WebApiManagerTests.js
+++ b/services/real-time/test/unit/js/WebApiManagerTests.js
@@ -9,8 +9,6 @@
  * DS102: Remove unnecessary code created because of implicit returns
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const chai = require('chai')
-const should = chai.should()
 const sinon = require('sinon')
 const modulePath = '../../../app/js/WebApiManager.js'
 const SandboxedModule = require('sandboxed-module')
@@ -33,10 +31,6 @@ describe('WebApiManager', function () {
               pass: 'password'
             }
           }
-        }),
-        'logger-sharelatex': (this.logger = {
-          log: sinon.stub(),
-          error: sinon.stub()
         })
       }
     }))
diff --git a/services/real-time/test/unit/js/WebsocketControllerTests.js b/services/real-time/test/unit/js/WebsocketControllerTests.js
index c5f4a1ac42..e227a1ce82 100644
--- a/services/real-time/test/unit/js/WebsocketControllerTests.js
+++ b/services/real-time/test/unit/js/WebsocketControllerTests.js
@@ -12,10 +12,8 @@
  * DS102: Remove unnecessary code created because of implicit returns
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const chai = require('chai')
-const should = chai.should()
 const sinon = require('sinon')
-const { expect } = chai
+const { expect } = require('chai')
 const modulePath = '../../../app/js/WebsocketController.js'
 const SandboxedModule = require('sandboxed-module')
 const tk = require('timekeeper')
@@ -50,11 +48,6 @@ describe('WebsocketController', function () {
         './DocumentUpdaterManager': (this.DocumentUpdaterManager = {}),
         './ConnectedUsersManager': (this.ConnectedUsersManager = {}),
         './WebsocketLoadBalancer': (this.WebsocketLoadBalancer = {}),
-        'logger-sharelatex': (this.logger = {
-          log: sinon.stub(),
-          error: sinon.stub(),
-          warn: sinon.stub()
-        }),
         '@overleaf/metrics': (this.metrics = {
           inc: sinon.stub(),
           set: sinon.stub()
diff --git a/services/real-time/test/unit/js/WebsocketLoadBalancerTests.js b/services/real-time/test/unit/js/WebsocketLoadBalancerTests.js
index 355e635353..9e61501305 100644
--- a/services/real-time/test/unit/js/WebsocketLoadBalancerTests.js
+++ b/services/real-time/test/unit/js/WebsocketLoadBalancerTests.js
@@ -11,7 +11,6 @@
  */
 const SandboxedModule = require('sandboxed-module')
 const sinon = require('sinon')
-require('chai').should()
 const modulePath = require('path').join(
   __dirname,
   '../../../app/js/WebsocketLoadBalancer'
@@ -26,10 +25,6 @@ describe('WebsocketLoadBalancer', function () {
         './RedisClientManager': {
           createClientList: () => []
         },
-        'logger-sharelatex': (this.logger = {
-          log: sinon.stub(),
-          error: sinon.stub()
-        }),
         './SafeJsonParse': (this.SafeJsonParse = {
           parse: (data, cb) => cb(null, JSON.parse(data))
         }),