diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8dec30f1..e841c3ad 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,6 +33,26 @@ jobs:
       - name: Lint & Format
         run: npm run lint && npm run format:check
 
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: Setup Node.js
+        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
+        with:
+          node-version: lts/*
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm run test
+
   build:
     runs-on: ubuntu-latest
     steps:
diff --git a/package.json b/package.json
index 5ccdd27c..00dbd473 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
     "build:html": "node scripts/html/index.mjs && node scripts/html/sitemap-index.mjs",
     "build:rss-feed": "node scripts/rss-feed/index.mjs",
     "build": "npm-run-all build:*",
+    "test": "node --test",
     "lint": "npm-run-all \"lint:!(fix)\"",
     "lint:fix": "npm-run-all lint:*:fix",
     "lint:js": "eslint .",
diff --git a/scripts/markdown/api/configuration.mjs b/scripts/markdown/api/configuration.mjs
index 5f40b54e..cbc087b6 100644
--- a/scripts/markdown/api/configuration.mjs
+++ b/scripts/markdown/api/configuration.mjs
@@ -1,7 +1,7 @@
 import { writeFile } from 'node:fs/promises';
 import { join } from 'node:path/posix';
 import { major } from 'semver';
-import { sources, getPackageFile, outputDir } from './utils.mjs';
+import { getSources, getPackageFile, outputDir } from './utils.mjs';
 
 const definitionName = ref =>
   ref?.startsWith('#/definitions/') ? ref.slice('#/definitions/'.length) : '';
@@ -413,6 +413,7 @@ const generate = async packageDir => {
   );
 };
 
+const sources = await getSources();
 for (const source of sources) {
   await generate(source);
 }
diff --git a/scripts/markdown/api/index.mjs b/scripts/markdown/api/index.mjs
index a4718a79..848a7af3 100644
--- a/scripts/markdown/api/index.mjs
+++ b/scripts/markdown/api/index.mjs
@@ -1,43 +1,28 @@
 import { join } from 'node:path/posix';
 import { Application } from 'typedoc';
 import { major } from 'semver';
-import { sources, outputDir, getPackageFile } from './utils.mjs';
+import {
+  getSources,
+  outputDir,
+  getPackageFile,
+  typeDocConfig,
+} from './utils.mjs';
 
 const generate = async packageDir => {
   const { version } = await getPackageFile(packageDir);
 
   const app = await Application.bootstrapWithPlugins({
+    ...typeDocConfig,
     entryPoints: [join(packageDir, 'types.d.ts')],
     out: join(outputDir, `v${major(version)}.x`),
     publicPath: `/docs/api/v${major(version)}.x/`,
-
-    plugin: [
-      'typedoc-plugin-markdown',
-      'typedoc-plugin-missing-exports',
-      './plugins/processor/index.mjs',
-      './plugins/theme/index.mjs',
-    ],
-    theme: 'doc-kit',
-    router: 'doc-kit',
-
-    hideGroupHeadings: true,
-    hideBreadcrumbs: true,
-    hidePageHeader: true,
-    readme: 'none',
-    disableSources: true,
-    propertiesFormat: 'table',
-    membersWithOwnFile: ['Class'],
-
-    modulesFileName: 'index',
-    entryFileName: 'index',
-    tsconfig: 'tsconfig.json',
-    excludeExternals: true,
   });
 
   const project = await app.convert();
   await app.generateOutputs(project);
 };
 
+const sources = await getSources();
 for (const source of sources) {
   await generate(source);
 }
diff --git a/scripts/markdown/api/utils.mjs b/scripts/markdown/api/utils.mjs
index dd9ebbd6..e854cc62 100644
--- a/scripts/markdown/api/utils.mjs
+++ b/scripts/markdown/api/utils.mjs
@@ -4,13 +4,39 @@ import { join } from 'node:path/posix';
 const [packageDir] = process.argv.slice(2);
 const cacheDir = join('.', '.cache', 'webpack');
 
-export const sources = packageDir
-  ? [packageDir]
-  : (await readdir(cacheDir, { withFileTypes: true }))
-      .filter(entry => entry.isDirectory())
-      .map(entry => join(cacheDir, entry.name));
+export const getSources = async () => {
+  if (packageDir) return [packageDir];
+  const sources = await readdir(cacheDir, { withFileTypes: true });
+  return sources
+    .filter(entry => entry.isDirectory())
+    .map(entry => join(cacheDir, entry.name));
+};
 
 export const outputDir = join('pages', 'docs', 'api');
 
 export const getPackageFile = async (packageDir, file = 'package.json') =>
   JSON.parse(await readFile(join(packageDir, file), 'utf8'));
+
+export const typeDocConfig = {
+  plugin: [
+    'typedoc-plugin-markdown',
+    'typedoc-plugin-missing-exports',
+    './plugins/processor/index.mjs',
+    './plugins/theme/index.mjs',
+  ],
+  theme: 'doc-kit',
+  router: 'doc-kit',
+
+  hideGroupHeadings: true,
+  hideBreadcrumbs: true,
+  hidePageHeader: true,
+  readme: 'none',
+  disableSources: true,
+  propertiesFormat: 'table',
+  membersWithOwnFile: ['Class'],
+
+  modulesFileName: 'index',
+  entryFileName: 'index',
+  tsconfig: 'tsconfig.json',
+  excludeExternals: true,
+};
diff --git a/tests/theme/fixtures/input.js b/tests/theme/fixtures/input.js
new file mode 100644
index 00000000..4eb241a0
--- /dev/null
+++ b/tests/theme/fixtures/input.js
@@ -0,0 +1,25 @@
+/* eslint-disable */
+
+export class OverloadedTest {
+  /**
+   * First overload signature.
+   * @overload
+   * @param {string} name A simple string parameter
+   * @param {number} count A simple number parameter
+   * @returns {void}
+   */
+  /**
+   * Second overload signature.
+   * @overload
+   * @param {boolean} isEnabled A simple boolean parameter
+   * @returns {string}
+   */
+  /**
+   * Third overload signature.
+   * @overload
+   * @param {number} id A simple string parameter
+   * @param {boolean} isEnabled  A simple boolean parameter
+   * @returns {void}
+   */
+  overloadedMethod(id, isEnabled) {}
+}
diff --git a/tests/theme/fixtures/tsconfig.json b/tests/theme/fixtures/tsconfig.json
new file mode 100644
index 00000000..caddb7f2
--- /dev/null
+++ b/tests/theme/fixtures/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "include": ["**/*.js"],
+  "compilerOptions": {
+    "allowJs": true,
+    "esModuleInterop": true,
+    "noEmit": true,
+    "skipLibCheck": true
+  }
+}
diff --git a/tests/theme/theme.test.mjs b/tests/theme/theme.test.mjs
new file mode 100644
index 00000000..8243c696
--- /dev/null
+++ b/tests/theme/theme.test.mjs
@@ -0,0 +1,39 @@
+import { test } from 'node:test';
+import { Application } from 'typedoc';
+import { readdirSync, readFileSync, rmSync } from 'node:fs';
+import { join } from 'node:path/posix';
+import { typeDocConfig } from '../../scripts/markdown/api/utils.mjs';
+
+const fixturesDir = './tests/theme/fixtures';
+const outputDir = './tests/theme/.temp';
+
+test('TypeDoc Theme - Edge Cases Fixture', async t => {
+  const inputFilePath = join(fixturesDir, 'input.js');
+
+  const app = await Application.bootstrapWithPlugins({
+    ...typeDocConfig,
+    entryPoints: [inputFilePath],
+    out: outputDir,
+    publicPath: '/',
+    tsconfig: join(fixturesDir, 'tsconfig.json'),
+  });
+
+  const project = await app.convert();
+  await app.generateOutputs(project);
+
+  const mdFiles = readdirSync(outputDir, { recursive: true }).filter(
+    f => f.endsWith('.md') && !f.endsWith('index.md')
+  );
+
+  if (mdFiles.length === 0) throw new Error('No markdown file generated');
+
+  mdFiles.sort();
+
+  const actualMarkdown = mdFiles
+    .map(f => readFileSync(join(outputDir, f), 'utf-8'))
+    .join('\n\n---\n\n');
+
+  rmSync(outputDir, { recursive: true, force: true });
+
+  t.assert.snapshot(actualMarkdown);
+});
diff --git a/tests/theme/theme.test.mjs.snapshot b/tests/theme/theme.test.mjs.snapshot
new file mode 100644
index 00000000..06ca5ffd
--- /dev/null
+++ b/tests/theme/theme.test.mjs.snapshot
@@ -0,0 +1,3 @@
+exports[`TypeDoc Theme - Edge Cases Fixture 1`] = `
+"# Class: \`webpack.js.org.OverloadedTest\`\\n\\n## Constructors\\n\\n### \`new OverloadedTest()\`\\n\\n* Returns: {OverloadedTest}\\n\\n## Methods\\n\\n### \`overloadedMethod(name, count)\`\\n\\n#### Call Signature\\n\\n* \`name\` {string} A simple string parameter\\n* \`count\` {number} A simple number parameter\\n* Returns: {void} \\n\\nFirst overload signature.\\n\\n#### Call Signature\\n\\n* \`isEnabled\` {boolean} A simple boolean parameter\\n* Returns: {string} \\n\\nSecond overload signature.\\n\\n#### Call Signature\\n\\n* \`id\` {number} A simple string parameter\\n* \`isEnabled\` {boolean} A simple boolean parameter\\n* Returns: {void} \\n\\nThird overload signature.\\n"
+`;