diff --git a/.eslintrc.json b/.eslintrc.json
index 208f455dc..5ee1474b4 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,7 +1,7 @@
 {
   "root": true,
   "parserOptions": {
-    "tsconfigRootDir": "",
+    "tsconfigRootDir": ".",
     "project": [
       "./tsconfig.json"
     ]
@@ -16,11 +16,21 @@
         "prefer": "type-imports",
         "disallowTypeAnnotations": false
       }
-    ]
+    ],
+    "jest/no-disabled-tests": "warn",
+    "jest/no-focused-tests": "error",
+    "jest/no-identical-title": "error",
+    "jest/prefer-to-have-length": "warn",
+    "jest/valid-expect": "error"
+  },
+  "env": {
+    "jest": true,
+    "jest/globals": true
   },
   "plugins": [
     "@typescript-eslint",
-    "testing-library"
+    "testing-library",
+    "jest"
   ],
   "extends": [
     "next/core-web-vitals",
diff --git a/package.json b/package.json
index 85bc364de..c6460dc5c 100644
--- a/package.json
+++ b/package.json
@@ -144,6 +144,7 @@
     "eslint-config-prettier": "8.5.0",
     "eslint-plugin-chai-friendly": "0.7.2",
     "eslint-plugin-cypress": "2.12.1",
+    "eslint-plugin-jest": "26.4.6",
     "eslint-plugin-node": "11.1.0",
     "eslint-plugin-promise": "6.0.0",
     "eslint-plugin-testing-library": "5.5.1",
diff --git a/src/components/markdown-renderer/utils/node-to-react-transformer.test.tsx b/src/components/markdown-renderer/utils/node-to-react-transformer.test.tsx
index f8dd28c78..48f25e18a 100644
--- a/src/components/markdown-renderer/utils/node-to-react-transformer.test.tsx
+++ b/src/components/markdown-renderer/utils/node-to-react-transformer.test.tsx
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
  *
  * SPDX-License-Identifier: AGPL-3.0-only
  */
@@ -8,7 +8,7 @@ import { NodeToReactTransformer } from './node-to-react-transformer'
 import { Element } from 'domhandler'
 import type { ReactElement, ReactHTMLElement } from 'react'
 import type { NodeReplacement } from '../replace-components/component-replacer'
-import { DO_NOT_REPLACE, REPLACE_WITH_NOTHING } from '../replace-components/component-replacer'
+import { ComponentReplacer, DO_NOT_REPLACE, REPLACE_WITH_NOTHING } from '../replace-components/component-replacer'
 
 describe('node to react transformer', () => {
   let nodeToReactTransformer: NodeToReactTransformer
@@ -28,11 +28,11 @@ describe('node to react transformer', () => {
 
     it('can replace an element nothing', () => {
       nodeToReactTransformer.setReplacers([
-        {
+        new (class extends ComponentReplacer {
           replace(): NodeReplacement {
             return REPLACE_WITH_NOTHING
           }
-        }
+        })()
       ])
       const translation = nodeToReactTransformer.translateNodeToReactElement(defaultTestSpanElement, 1) as ReactElement
       expect(translation).toEqual(null)
@@ -40,11 +40,11 @@ describe('node to react transformer', () => {
 
     it('can translate an element with no matching replacer', () => {
       nodeToReactTransformer.setReplacers([
-        {
+        new (class extends ComponentReplacer {
           replace(): NodeReplacement {
             return DO_NOT_REPLACE
           }
-        }
+        })()
       ])
       const translation = nodeToReactTransformer.translateNodeToReactElement(defaultTestSpanElement, 1) as ReactElement
 
@@ -54,11 +54,11 @@ describe('node to react transformer', () => {
 
     it('can replace an element', () => {
       nodeToReactTransformer.setReplacers([
-        {
+        new (class extends ComponentReplacer {
           replace(): NodeReplacement {
             return <div data-test2={'test2'} />
           }
-        }
+        })()
       ])
       const translation = nodeToReactTransformer.translateNodeToReactElement(defaultTestSpanElement, 1) as ReactElement
 
diff --git a/src/redux/note-details/format-selection/apply-format-type-to-markdown-lines.test.ts b/src/redux/note-details/format-selection/apply-format-type-to-markdown-lines.test.ts
index 925dfa03e..1b9dd9e5e 100644
--- a/src/redux/note-details/format-selection/apply-format-type-to-markdown-lines.test.ts
+++ b/src/redux/note-details/format-selection/apply-format-type-to-markdown-lines.test.ts
@@ -117,7 +117,7 @@ describe('apply format type to markdown lines', () => {
     expect(prependLinesOfSelectionMock).toBeCalledWith(markdownContentMock, cursorSelectionMock, expect.anything())
   })
 
-  it('can process the format type unordered list', () => {
+  it('can process the format type ordered list', () => {
     const result = applyFormatTypeToMarkdownLines(markdownContentMock, cursorSelectionMock, FormatType.ORDERED_LIST)
     expect(result).toEqual(['1. input', cursorSelectionMock])
     expect(prependLinesOfSelectionMock).toBeCalledWith(markdownContentMock, cursorSelectionMock, expect.anything())
diff --git a/yarn.lock b/yarn.lock
index 506ea24bf..ca6c5f2fc 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2050,6 +2050,7 @@ __metadata:
     eslint-config-prettier: 8.5.0
     eslint-plugin-chai-friendly: 0.7.2
     eslint-plugin-cypress: 2.12.1
+    eslint-plugin-jest: 26.4.6
     eslint-plugin-node: 11.1.0
     eslint-plugin-promise: 6.0.0
     eslint-plugin-testing-library: 5.5.1
@@ -5127,7 +5128,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@typescript-eslint/utils@npm:5.27.0, @typescript-eslint/utils@npm:^5.13.0":
+"@typescript-eslint/utils@npm:5.27.0, @typescript-eslint/utils@npm:^5.10.0, @typescript-eslint/utils@npm:^5.13.0":
   version: 5.27.0
   resolution: "@typescript-eslint/utils@npm:5.27.0"
   dependencies:
@@ -9899,6 +9900,23 @@ __metadata:
   languageName: node
   linkType: hard
 
+"eslint-plugin-jest@npm:26.4.6":
+  version: 26.4.6
+  resolution: "eslint-plugin-jest@npm:26.4.6"
+  dependencies:
+    "@typescript-eslint/utils": ^5.10.0
+  peerDependencies:
+    "@typescript-eslint/eslint-plugin": ^5.0.0
+    eslint: ^6.0.0 || ^7.0.0 || ^8.0.0
+  peerDependenciesMeta:
+    "@typescript-eslint/eslint-plugin":
+      optional: true
+    jest:
+      optional: true
+  checksum: 1d4c35282abecbc3656f9a355c3e63df0b4134fae208ceb9ee75421ed95f6a108753ac86b54d9302f4ae192227c41b45a50034854e75fad3691868eaab8394a2
+  languageName: node
+  linkType: hard
+
 "eslint-plugin-jsx-a11y@npm:^6.5.1":
   version: 6.5.1
   resolution: "eslint-plugin-jsx-a11y@npm:6.5.1"