diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
new file mode 100644
index 0000000..e0609e8
--- /dev/null
+++ b/.github/workflows/pr.yml
@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version-file: '.nvmrc'
+      - name: Install dependencies
+        run: npm ci
+      - name: Lint
+        run: npm run lint
+      - name: Format
+        run: npm run format
+      - name: Test
+        run: npm test
+      - name: Test with coverage
+        run: npm run test:coverage
diff --git a/.nvmrc b/.nvmrc
new file mode 100644
index 0000000..2bd5a0a
--- /dev/null
+++ b/.nvmrc
@@ -0,0 +1 @@
+22
diff --git a/package.json b/package.json
index 9e2fea0..3120fde 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,12 @@
   "name": "@node-core/api-docs-tooling",
   "scripts": {
     "lint": "eslint .",
-    "format": "prettier --write .",
+    "lint:fix": "eslint --fix .",
+    "format": "prettier .",
+    "format:write": "prettier --write .",
+    "test": "node --test",
+    "test:watch": "node --test --watch",
+    "test:coverage": "node --experimental-test-coverage --test",
     "prepare": "husky"
   },
   "bin": {
diff --git a/src/generators/json-simple/index.mjs b/src/generators/json-simple/index.mjs
index ac12b65..5433bdc 100644
--- a/src/generators/json-simple/index.mjs
+++ b/src/generators/json-simple/index.mjs
@@ -25,7 +25,6 @@ export default {
   dependsOn: 'ast',
 
   async generate(input, options) {
-
     // This simply grabs all the different files and stringifies them
     const stringifiedContent = JSON.stringify(input, null, 2);
 
diff --git a/src/test/metadata.test.mjs b/src/test/metadata.test.mjs
new file mode 100644
index 0000000..39129de
--- /dev/null
+++ b/src/test/metadata.test.mjs
@@ -0,0 +1,58 @@
+import { strictEqual, deepStrictEqual } from 'node:assert';
+import { describe, it } from 'node:test';
+import GitHubSlugger from 'github-slugger';
+import { VFile } from 'vfile';
+
+import createMetadata from '../metadata.mjs';
+
+describe('createMetadata', () => {
+  it('should set the heading correctly', () => {
+    const slugger = new GitHubSlugger();
+    const metadata = createMetadata(slugger);
+    const heading = {
+      text: 'Test Heading',
+      type: 'test',
+      name: 'test',
+      depth: 1,
+    };
+    metadata.setHeading(heading);
+    strictEqual(metadata.create(new VFile(), {}).heading, heading);
+  });
+
+  it('should set the stability correctly', () => {
+    const slugger = new GitHubSlugger();
+    const metadata = createMetadata(slugger);
+    const stability = 2;
+    metadata.setStability(stability);
+    strictEqual(metadata.create(new VFile(), {}).stability, stability);
+  });
+
+  it('should create a metadata entry correctly', () => {
+    const slugger = new GitHubSlugger();
+    const metadata = createMetadata(slugger);
+    const apiDoc = new VFile({ path: 'test.md' });
+    const section = { type: 'root', children: [] };
+    const heading = {
+      text: 'Test Heading',
+      type: 'test',
+      name: 'test',
+      depth: 1,
+    };
+    const stability = 2;
+    const properties = { source_link: 'test.com' };
+    metadata.setHeading(heading);
+    metadata.setStability(stability);
+    metadata.updateProperties(properties);
+    const expected = {
+      api: 'test',
+      slug: 'test.html#test-heading',
+      sourceLink: 'test.com',
+      updates: [],
+      changes: [],
+      heading,
+      stability,
+      content: section,
+    };
+    deepStrictEqual(metadata.create(apiDoc, section), expected);
+  });
+});
diff --git a/src/test/parser.test.mjs b/src/test/parser.test.mjs
new file mode 100644
index 0000000..a53a901
--- /dev/null
+++ b/src/test/parser.test.mjs
@@ -0,0 +1,83 @@
+import { deepStrictEqual } from 'node:assert';
+import { describe, it } from 'node:test';
+import { VFile } from 'vfile';
+import createParser from '../parser.mjs';
+
+describe('createParser', () => {
+  it('should parse a single API doc correctly', async () => {
+    const parser = createParser();
+    const apiDoc = new VFile({
+      path: 'test.md',
+      value: '# Test Heading\n\nThis is a test.',
+    });
+    const expected = [
+      {
+        api: 'test',
+        slug: 'test.html#test-heading',
+        sourceLink: undefined,
+        updates: [],
+        changes: [],
+        heading: {
+          text: 'Test Heading',
+          type: 'module',
+          name: 'Test Heading',
+          depth: 1,
+        },
+        stability: undefined,
+        content: { type: 'root', children: [] },
+      },
+    ];
+    const actual = await parser.parseApiDoc(apiDoc);
+    delete actual[0].content.toJSON;
+    deepStrictEqual(actual, expected);
+  });
+
+  it('should parse multiple API docs correctly', async () => {
+    const parser = createParser();
+    const apiDocs = [
+      new VFile({
+        path: 'test1.md',
+        value: '# Test Heading 1\n\nThis is a test.',
+      }),
+      new VFile({
+        path: 'test2.md',
+        value: '# Test Heading 2\n\nThis is another test.',
+      }),
+    ];
+    const expected = [
+      {
+        api: 'test1',
+        slug: 'test1.html#test-heading-1',
+        sourceLink: undefined,
+        updates: [],
+        changes: [],
+        heading: {
+          text: 'Test Heading 1',
+          type: 'module',
+          name: 'Test Heading 1',
+          depth: 1,
+        },
+        stability: undefined,
+        content: { type: 'root', children: [] },
+      },
+      {
+        api: 'test2',
+        slug: 'test2.html#test-heading-2',
+        sourceLink: undefined,
+        updates: [],
+        changes: [],
+        heading: {
+          text: 'Test Heading 2',
+          type: 'module',
+          name: 'Test Heading 2',
+          depth: 1,
+        },
+        stability: undefined,
+        content: { type: 'root', children: [] },
+      },
+    ];
+    const actual = await parser.parseApiDocs(apiDocs);
+    actual.forEach(entry => delete entry.content.toJSON);
+    deepStrictEqual(actual, expected);
+  });
+});
diff --git a/src/test/queries.test.mjs b/src/test/queries.test.mjs
new file mode 100644
index 0000000..acb02c9
--- /dev/null
+++ b/src/test/queries.test.mjs
@@ -0,0 +1,93 @@
+import { strictEqual, deepStrictEqual } from 'node:assert';
+import { describe, it } from 'node:test';
+import createQueries from '../queries.mjs';
+
+describe('createQueries', () => {
+  it('should add YAML metadata correctly', () => {
+    const queries = createQueries();
+    const node = { value: 'type: test\nname: test\n' };
+    const apiEntryMetadata = {
+      updateProperties: properties => {
+        deepStrictEqual(properties, { type: 'test', name: 'test' });
+      },
+    };
+    queries.addYAMLMetadata(node, apiEntryMetadata);
+  });
+
+  // valid type
+  it('should update type to reference correctly', () => {
+    const queries = createQueries();
+    const node = { value: 'This is a {string} type.' };
+    queries.updateTypeToReferenceLink(node);
+    strictEqual(node.type, 'html');
+    strictEqual(
+      node.value,
+      'This is a [`string`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) type.'
+    );
+  });
+
+  it('should update type to reference not correctly if no match', () => {
+    const queries = createQueries();
+    const node = { value: 'This is a {test} type.' };
+    queries.updateTypeToReferenceLink(node);
+    strictEqual(node.type, 'html');
+    strictEqual(node.value, 'This is a test type.');
+  });
+
+  it('should add heading metadata correctly', () => {
+    const queries = createQueries();
+    const node = {
+      depth: 2,
+      children: [{ type: 'text', value: 'Test Heading' }],
+    };
+    const apiEntryMetadata = {
+      setHeading: heading => {
+        deepStrictEqual(heading, {
+          text: 'Test Heading',
+          type: 'module',
+          name: 'Test Heading',
+          depth: 2,
+        });
+      },
+    };
+    queries.addHeadingMetadata(node, apiEntryMetadata);
+  });
+
+  it('should update markdown link correctly', () => {
+    const queries = createQueries();
+    const node = { type: 'link', url: 'test.md#heading' };
+    queries.updateMarkdownLink(node);
+    strictEqual(node.url, 'test.html#heading');
+  });
+
+  it('should update link reference correctly', () => {
+    const queries = createQueries();
+    const node = { type: 'linkReference', identifier: 'test' };
+    const definitions = [{ identifier: 'test', url: 'test.html#test' }];
+    queries.updateLinkReference(node, definitions);
+    strictEqual(node.type, 'link');
+    strictEqual(node.url, 'test.html#test');
+  });
+
+  it('should add stability index metadata correctly', () => {
+    const queries = createQueries();
+    const node = {
+      type: 'blockquote',
+      children: [
+        {
+          type: 'paragraph',
+          children: [{ type: 'text', value: 'Stability: 2 - Frozen' }],
+        },
+      ],
+    };
+    const apiEntryMetadata = {
+      setStability: stability => {
+        deepStrictEqual(stability.toJSON(), {
+          index: 2,
+          description: 'Frozen',
+        });
+      },
+    };
+    queries.addStabilityIndexMetadata(node, apiEntryMetadata);
+  });
+});
diff --git a/src/utils/tests/parser.test.mjs b/src/utils/tests/parser.test.mjs
new file mode 100644
index 0000000..a00f068
--- /dev/null
+++ b/src/utils/tests/parser.test.mjs
@@ -0,0 +1,84 @@
+import { strictEqual, deepStrictEqual } from 'node:assert';
+import { describe, it } from 'node:test';
+
+import {
+  parseYAMLIntoMetadata,
+  transformTypeToReferenceLink,
+  parseHeadingIntoMetadata,
+} from '../parser.mjs';
+
+describe('transformTypeToReferenceLink', () => {
+  it('should transform a JavaScript primitive type into a Markdown link', () => {
+    strictEqual(
+      transformTypeToReferenceLink('string'),
+      '[`string`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type)'
+    );
+  });
+
+  it('should transform a JavaScript global type into a Markdown link', () => {
+    strictEqual(
+      transformTypeToReferenceLink('Array'),
+      '[`Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)'
+    );
+  });
+});
+
+describe('parseYAMLIntoMetadata', () => {
+  it('should parse a YAML string into a JavaScript object', () => {
+    const input = 'name: test\ntype: string\nintroduced_in: v1.0.0';
+    const expectedOutput = {
+      name: 'test',
+      type: 'string',
+      updates: [
+        {
+          type: 'introduced_in',
+          version: ['v1.0.0'],
+        },
+      ],
+    };
+    deepStrictEqual(parseYAMLIntoMetadata(input), expectedOutput);
+  });
+
+  it('should parse a YAML string with multiple versions into a JavaScript object', () => {
+    const input = 'name: test\ntype: string\nintroduced_in: [v1.0.0, v1.1.0]';
+    const expectedOutput = {
+      name: 'test',
+      type: 'string',
+      updates: [
+        {
+          type: 'introduced_in',
+          version: ['v1.0.0', 'v1.1.0'],
+        },
+      ],
+    };
+    deepStrictEqual(parseYAMLIntoMetadata(input), expectedOutput);
+  });
+
+  it('should parse a YAML string with source_link into a JavaScript object', () => {
+    const input =
+      'name: test\ntype: string\nintroduced_in: v1.0.0\nsource_link: https://github.com/nodejs/node';
+    const expectedOutput = {
+      name: 'test',
+      type: 'string',
+      updates: [
+        {
+          type: 'introduced_in',
+          version: ['v1.0.0'],
+        },
+      ],
+      source_link: 'https://github.com/nodejs/node',
+    };
+    deepStrictEqual(parseYAMLIntoMetadata(input), expectedOutput);
+  });
+
+  it('should parse a raw Heading string into Heading metadata', () => {
+    const input = '## test';
+    const expectedOutput = {
+      text: '## test',
+      type: 'module',
+      name: '## test',
+      depth: 2,
+    };
+    deepStrictEqual(parseHeadingIntoMetadata(input, 2), expectedOutput);
+  });
+});
diff --git a/src/utils/tests/slugger.test.mjs b/src/utils/tests/slugger.test.mjs
new file mode 100644
index 0000000..d4c0dc3
--- /dev/null
+++ b/src/utils/tests/slugger.test.mjs
@@ -0,0 +1,22 @@
+import { strictEqual } from 'node:assert';
+import { describe, it } from 'node:test';
+
+import { createNodeSlugger } from '../slugger.mjs';
+
+describe('createNodeSlugger', () => {
+  it('should create a new instance of the GitHub Slugger', () => {
+    const slugger = createNodeSlugger();
+    strictEqual(typeof slugger.slug, 'function');
+    strictEqual(typeof slugger.reset, 'function');
+  });
+
+  it('should create a new slug based on the provided string', () => {
+    const slugger = createNodeSlugger();
+    strictEqual(slugger.slug('Test'), 'test');
+  });
+
+  it('should reset the cache of the Slugger', () => {
+    const slugger = createNodeSlugger();
+    slugger.reset();
+  });
+});
diff --git a/src/utils/tests/unist.test.mjs b/src/utils/tests/unist.test.mjs
new file mode 100644
index 0000000..a67de08
--- /dev/null
+++ b/src/utils/tests/unist.test.mjs
@@ -0,0 +1,72 @@
+import { strictEqual } from 'node:assert';
+import { describe, it } from 'node:test';
+
+import { transformNodesToString, callIfBefore } from '../unist.mjs';
+
+describe('transformNodesToString', () => {
+  it('should transform a list of Nodes into a string', () => {
+    const nodes = [
+      {
+        type: 'paragraph',
+        children: [
+          {
+            type: 'text',
+            value: 'Hello, ',
+          },
+          {
+            type: 'strong',
+            children: [
+              {
+                type: 'text',
+                value: 'World',
+              },
+            ],
+          },
+        ],
+      },
+    ];
+    strictEqual(transformNodesToString(nodes), 'Hello, **World**');
+  });
+});
+
+describe('callIfBefore', () => {
+  it('should call the callback if the first Node is before the second Node', () => {
+    const nodeA = {
+      position: {
+        start: {
+          line: 1,
+        },
+      },
+    };
+    const nodeB = {
+      position: {
+        start: {
+          line: 2,
+        },
+      },
+    };
+    callIfBefore(nodeA, nodeB, (nodeA, nodeB) => {
+      strictEqual(nodeA.position.start.line < nodeB.position.start.line, true);
+    });
+  });
+
+  it('should not call the callback if the first Node is not before the second Node', () => {
+    const nodeA = {
+      position: {
+        start: {
+          line: 2,
+        },
+      },
+    };
+    const nodeB = {
+      position: {
+        start: {
+          line: 1,
+        },
+      },
+    };
+    callIfBefore(nodeA, nodeB, (nodeA, nodeB) => {
+      strictEqual(nodeA.position.start.line < nodeB.position.start.line, true);
+    });
+  });
+});