diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 7dc915d..43245b9 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -15,4 +15,5 @@ jobs:
     - name: Build
       run: |
         npm ci
+        npm test
         npx gulp bundle
diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
index e431000..37914ad 100644
--- a/.github/workflows/push.yml
+++ b/.github/workflows/push.yml
@@ -17,6 +17,7 @@ jobs:
     - name: Build
       run: |
         npm ci
+        npm test
         npx gulp bundle
     - name: Release
       uses: marvinpinto/action-automatic-releases@v1.2.1
diff --git a/gulpfile.js b/gulpfile.js
index 25ce769..64d3bc1 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -19,6 +19,7 @@ const glob = {
   all: [srcDir, previewSrcDir],
   css: `${srcDir}/css/**/*.css`,
   js: ['gulpfile.js', 'gulp.d/**/*.js', `${srcDir}/{helpers,js}/**/*.js`],
+  test: ['test/**/*.js'],
 }
 
 const cleanTask = createTask({
@@ -39,16 +40,34 @@ const lintJsTask = createTask({
   call: task.lintJs(glob.js),
 })
 
+const lintTestJsTask = createTask({
+  name: 'lint:testjs',
+  desc: 'Lint the JavaScript source files using eslint (JavaScript Standard Style)',
+  call: task.lintJs(glob.test),
+})
+
 const lintTask = createTask({
   name: 'lint',
   desc: 'Lint the CSS and JavaScript source files',
-  call: parallel(lintCssTask, lintJsTask),
+  call: parallel(lintCssTask, lintJsTask, lintTestJsTask),
+})
+
+const formatJsTask = createTask({
+  name: 'format:js',
+  desc: 'Format the JavaScript source files using prettify (JavaScript Standard Style)',
+  call: task.format(glob.test),
+})
+
+const formatTestJsTask = createTask({
+  name: 'format:testjs',
+  desc: 'Format the JavaScript source files using prettify (JavaScript Standard Style)',
+  call: task.format(glob.test),
 })
 
 const formatTask = createTask({
   name: 'format',
-  desc: 'Format the JavaScript source files using prettify (JavaScript Standard Style)',
-  call: task.format(glob.js),
+  desc: 'Lint the CSS and JavaScript source files',
+  call: parallel(formatJsTask, formatTestJsTask),
 })
 
 const buildTask = createTask({
diff --git a/package-lock.json b/package-lock.json
index 7e752a8..fc5baf5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,8 +18,12 @@
         "autoprefixer": "~10.4",
         "browser-pack-flat": "~3.5",
         "browserify": "~17.0",
+        "chai": "~4.3",
+        "chai-fs": "~2.0",
+        "chai-spies": "~1.0",
         "core-js": "~3.26",
         "cssnano": "~5.1",
+        "dirty-chai": "~2.0",
         "eslint": "~6.8",
         "eslint-config-standard": "~14.1",
         "eslint-plugin-import": "~2.22",
@@ -42,6 +46,7 @@
         "js-yaml": "~4.1",
         "merge-stream": "~2.0",
         "micromodal": "^0.4.10",
+        "mocha": "~10.2",
         "postcss": "~8.4",
         "postcss-calc": "~8.2",
         "postcss-custom-properties": "~12.1",
@@ -1535,6 +1540,19 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/array-events": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/array-events/-/array-events-0.2.0.tgz",
+      "integrity": "sha512-Js6+JM/MxB72WeODWcUOOD/BWRqx6QTff8FWvweERQ0MdzViScUJV4XwRFnXvyvbfhuwWNrwhid7IJe2ux3r4Q==",
+      "dev": true,
+      "dependencies": {
+        "async-arrays": "*",
+        "extended-emitter": "*"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/array-find-index": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.2.tgz",
@@ -1777,6 +1795,15 @@
         "inherits": "2.0.1"
       }
     },
+    "node_modules/assertion-error": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
+      "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
+      "dev": true,
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/assign-symbols": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
@@ -1795,6 +1822,18 @@
         "node": ">=4"
       }
     },
+    "node_modules/async-arrays": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/async-arrays/-/async-arrays-2.0.0.tgz",
+      "integrity": "sha512-lMm6njQEX7gHbdX/b+PGBDXD/Vwg40BKSatlOaWNxrW/O5wYzARmoh+50h58s3hsyzGPU5+xYndwtc+m91yLiw==",
+      "dev": true,
+      "dependencies": {
+        "sift": "*"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/async-done": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/async-done/-/async-done-1.3.2.tgz",
@@ -2308,6 +2347,18 @@
         "file-uri-to-path": "1.0.0"
       }
     },
+    "node_modules/bit-mask": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/bit-mask/-/bit-mask-1.0.2.tgz",
+      "integrity": "sha512-UGtq08LSiazxL4zVmBzrhdCWnT4RWx3JhhD/3crhfv8xxjnVHxf/WoVjEstjSUaZeZRP7kZrWNqup1VvUClCaQ==",
+      "dev": true,
+      "dependencies": {
+        "array-events": "^0.2.0"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/bl": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/bl/-/bl-1.2.3.tgz",
@@ -2448,6 +2499,12 @@
         "resolve": "^1.17.0"
       }
     },
+    "node_modules/browser-stdout": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
+      "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
+      "dev": true
+    },
     "node_modules/browserify": {
       "version": "17.0.0",
       "resolved": "https://registry.npmjs.org/browserify/-/browserify-17.0.0.tgz",
@@ -2822,6 +2879,12 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/call-me-maybe": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/call-me-maybe/-/call-me-maybe-1.0.2.tgz",
+      "integrity": "sha512-HpX65o1Hnr9HH25ojC1YGs7HCQLq0GCOibSaWER0eNpgJ/Z1MZv2mTc7+xh6WOPxbRVcmgbv4hGU+uSQ/2xFZQ==",
+      "dev": true
+    },
     "node_modules/callsites": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -2909,6 +2972,52 @@
         "node": ">=4"
       }
     },
+    "node_modules/chai": {
+      "version": "4.3.10",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.3.10.tgz",
+      "integrity": "sha512-0UXG04VuVbruMUYbJ6JctvH0YnC/4q3/AkT18q4NaITo91CUm0liMS9VqzT9vZhVQ/1eqPanMWjBM+Juhfb/9g==",
+      "dev": true,
+      "dependencies": {
+        "assertion-error": "^1.1.0",
+        "check-error": "^1.0.3",
+        "deep-eql": "^4.1.3",
+        "get-func-name": "^2.0.2",
+        "loupe": "^2.3.6",
+        "pathval": "^1.1.1",
+        "type-detect": "^4.0.8"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/chai-fs": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/chai-fs/-/chai-fs-2.0.0.tgz",
+      "integrity": "sha512-PGfINFH/7XrQBnbp5/MnbFtzBL1//erKs+uoUdyo7KnW0mUX13L6bTO3Jm8OIexSVSh0Y+aaFhhbxyDtb679DA==",
+      "dev": true,
+      "dependencies": {
+        "bit-mask": "^1.0.1",
+        "readdir-enhanced": "^1.4.0"
+      },
+      "engines": {
+        "node": ">=4"
+      },
+      "peerDependencies": {
+        "chai": ">= 1.6.1 < 5"
+      }
+    },
+    "node_modules/chai-spies": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/chai-spies/-/chai-spies-1.0.0.tgz",
+      "integrity": "sha512-elF2ZUczBsFoP07qCfMO/zeggs8pqCf3fZGyK5+2X4AndS8jycZYID91ztD9oQ7d/0tnS963dPkd0frQEThDsg==",
+      "dev": true,
+      "engines": {
+        "node": ">= 4.0.0"
+      },
+      "peerDependencies": {
+        "chai": "*"
+      }
+    },
     "node_modules/chalk": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
@@ -2959,6 +3068,18 @@
       "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
       "dev": true
     },
+    "node_modules/check-error": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.3.tgz",
+      "integrity": "sha512-iKEoDYaRmd1mxM90a2OEfWhjsjPpYPuQ+lMYsoxB126+t8fw7ySEO48nmDg5COTjxDI65/Y2OWpeEHk3ZOe8zg==",
+      "dev": true,
+      "dependencies": {
+        "get-func-name": "^2.0.2"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/chokidar": {
       "version": "2.1.8",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.8.tgz",
@@ -4153,6 +4274,18 @@
       "integrity": "sha512-Q6fKUPqnAHAyhiUgFU7BUzLiv0kd8saH9al7tnu5Q/okj6dnupxyTgFIBjVzJATdfIAm9NAsvXNzjaKa+bxVyA==",
       "dev": true
     },
+    "node_modules/deep-eql": {
+      "version": "4.1.3",
+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-4.1.3.tgz",
+      "integrity": "sha512-WaEtAOpRA1MQ0eohqZjpGD8zdI0Ovsm8mmFhaDN8dvDZzyoUMcYDnf5Y6iu7HTXxf8JDS23qWa4a+hKCDyOPzw==",
+      "dev": true,
+      "dependencies": {
+        "type-detect": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/deep-is": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.4.tgz",
@@ -4294,6 +4427,15 @@
         "node": ">=0.8.0"
       }
     },
+    "node_modules/diff": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-5.0.0.tgz",
+      "integrity": "sha512-/VTCrvm5Z0JGty/BWHljh+BAiw3IK+2j87NGMu8Nwc/f48WoDAC395uomO9ZD117ZOBaHmkX1oyLvkVM/aIT3w==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.3.1"
+      }
+    },
     "node_modules/diffie-hellman": {
       "version": "5.0.3",
       "resolved": "https://registry.npmjs.org/diffie-hellman/-/diffie-hellman-5.0.3.tgz",
@@ -4323,6 +4465,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/dirty-chai": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/dirty-chai/-/dirty-chai-2.0.1.tgz",
+      "integrity": "sha512-ys79pWKvDMowIDEPC6Fig8d5THiC0DJ2gmTeGzVAoEH18J8OzLud0Jh7I9IWg3NSk8x2UocznUuFmfHCXYZx9w==",
+      "dev": true,
+      "peerDependencies": {
+        "chai": ">=2.2.1 <5"
+      }
+    },
     "node_modules/dlv": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/dlv/-/dlv-1.1.3.tgz",
@@ -4773,6 +4924,12 @@
         "event-emitter": "~0.3.5"
       }
     },
+    "node_modules/es6-promise": {
+      "version": "4.2.8",
+      "resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-4.2.8.tgz",
+      "integrity": "sha512-HJDGx5daxeIvxdBxvG2cb9g4tEvwIk3i8+nhX0yGrYmZUzbkdg8QbDevheDB8gd0//uPj4c1EQua8Q+MViT0/w==",
+      "dev": true
+    },
     "node_modules/es6-set": {
       "version": "0.1.6",
       "resolved": "https://registry.npmjs.org/es6-set/-/es6-set-0.1.6.tgz",
@@ -5620,6 +5777,18 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/extended-emitter": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/extended-emitter/-/extended-emitter-1.6.0.tgz",
+      "integrity": "sha512-TNF4xMKL9aKYTR2cTNkKYMUnKzzjfV5Nl6TX45smJ/796CmaFt+KCyidgGdod0Kgj5VSL+ctNIGVf+i1l3e+UA==",
+      "dev": true,
+      "dependencies": {
+        "sift": "*"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/external-editor": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/external-editor/-/external-editor-3.1.0.tgz",
@@ -6030,6 +6199,15 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/flat": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/flat/-/flat-5.0.2.tgz",
+      "integrity": "sha512-b6suED+5/3rTpUBdG1gupIl8MPFCAMA0QXwmljLhvCUKcUvdE4gWky9zpuGCcXHOsz4J9wPGNWq6OKpmIzz3hQ==",
+      "dev": true,
+      "bin": {
+        "flat": "cli.js"
+      }
+    },
     "node_modules/flat-cache": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-2.0.1.tgz",
@@ -6250,6 +6428,15 @@
       "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==",
       "dev": true
     },
+    "node_modules/get-func-name": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/get-func-name/-/get-func-name-2.0.2.tgz",
+      "integrity": "sha512-8vXOvuE167CtIc3OyItco7N/dpRtBbYOsPsXCz7X/PMnlGjYjSGuZJgM1Y7mmew7BKf9BqvLX2tnOVy1BBUsxQ==",
+      "dev": true,
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/get-intrinsic": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.2.1.tgz",
@@ -6458,6 +6645,12 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/glob-to-regexp": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/glob-to-regexp/-/glob-to-regexp-0.3.0.tgz",
+      "integrity": "sha512-Iozmtbqv0noj0uDDqoL0zNq0VBEfK2YFoMAZoxJe4cwphvLR+JskfF30QhXHOR4m3KrE6NLRYw+U9MRXvifyig==",
+      "dev": true
+    },
     "node_modules/glob-watcher": {
       "version": "5.0.5",
       "resolved": "https://registry.npmjs.org/glob-watcher/-/glob-watcher-5.0.5.tgz",
@@ -7371,6 +7564,15 @@
         "minimalistic-assert": "^1.0.1"
       }
     },
+    "node_modules/he": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/he/-/he-1.2.0.tgz",
+      "integrity": "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==",
+      "dev": true,
+      "bin": {
+        "he": "bin/he"
+      }
+    },
     "node_modules/highlight.js": {
       "version": "9.18.3",
       "resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-9.18.3.tgz",
@@ -9196,6 +9398,15 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/loupe": {
+      "version": "2.3.6",
+      "resolved": "https://registry.npmjs.org/loupe/-/loupe-2.3.6.tgz",
+      "integrity": "sha512-RaPMZKiMy8/JruncMU5Bt6na1eftNoo++R4Y+N2FrxkDVTrGvcyzFTsaGif4QTeKESheMGegbhw6iUAq+5A8zA==",
+      "dev": true,
+      "dependencies": {
+        "get-func-name": "^2.0.0"
+      }
+    },
     "node_modules/lowercase-keys": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/lowercase-keys/-/lowercase-keys-1.0.1.tgz",
@@ -9905,142 +10116,627 @@
       "integrity": "sha512-gKLcREMhtuZRwRAfqP3RFW+TK4JqApVBtOIftVgjuABpAtpxhPGaDcfvbhNvD0B8iD1oUr/txX35NjcaY6Ns/A==",
       "dev": true
     },
-    "node_modules/module-deps": {
-      "version": "6.2.3",
-      "resolved": "https://registry.npmjs.org/module-deps/-/module-deps-6.2.3.tgz",
-      "integrity": "sha512-fg7OZaQBcL4/L+AK5f4iVqf9OMbCclXfy/znXRxTVhJSeW5AIlS9AwheYwDaXM3lVW7OBeaeUEY3gbaC6cLlSA==",
-      "dev": true,
-      "dependencies": {
-        "browser-resolve": "^2.0.0",
-        "cached-path-relative": "^1.0.2",
-        "concat-stream": "~1.6.0",
-        "defined": "^1.0.0",
-        "detective": "^5.2.0",
-        "duplexer2": "^0.1.2",
-        "inherits": "^2.0.1",
-        "JSONStream": "^1.0.3",
-        "parents": "^1.0.0",
-        "readable-stream": "^2.0.2",
-        "resolve": "^1.4.0",
-        "stream-combiner2": "^1.1.1",
-        "subarg": "^1.0.0",
-        "through2": "^2.0.0",
-        "xtend": "^4.0.0"
+    "node_modules/mocha": {
+      "version": "10.2.0",
+      "resolved": "https://registry.npmjs.org/mocha/-/mocha-10.2.0.tgz",
+      "integrity": "sha512-IDY7fl/BecMwFHzoqF2sg/SHHANeBoMMXFlS9r0OXKDssYE1M5O43wUY/9BVPeIvfH2zmEbBfseqN9gBQZzXkg==",
+      "dev": true,
+      "dependencies": {
+        "ansi-colors": "4.1.1",
+        "browser-stdout": "1.3.1",
+        "chokidar": "3.5.3",
+        "debug": "4.3.4",
+        "diff": "5.0.0",
+        "escape-string-regexp": "4.0.0",
+        "find-up": "5.0.0",
+        "glob": "7.2.0",
+        "he": "1.2.0",
+        "js-yaml": "4.1.0",
+        "log-symbols": "4.1.0",
+        "minimatch": "5.0.1",
+        "ms": "2.1.3",
+        "nanoid": "3.3.3",
+        "serialize-javascript": "6.0.0",
+        "strip-json-comments": "3.1.1",
+        "supports-color": "8.1.1",
+        "workerpool": "6.2.1",
+        "yargs": "16.2.0",
+        "yargs-parser": "20.2.4",
+        "yargs-unparser": "2.0.0"
       },
       "bin": {
-        "module-deps": "bin/cmd.js"
+        "_mocha": "bin/_mocha",
+        "mocha": "bin/mocha.js"
       },
       "engines": {
-        "node": ">= 0.8.0"
+        "node": ">= 14.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/mochajs"
       }
     },
-    "node_modules/module-deps/node_modules/through2": {
-      "version": "2.0.5",
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+        "mutexify": "^1.1.0",
+        "pretty-hrtime": "^1.0.2"
+      },
+      "bin": {
+        "nanobench": "run.js",
+        "nanobench-compare": "compare.js"
+      }
+    },
+    "node_modules/nanobench/node_modules/ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
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+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/nanobench/node_modules/ansi-styles": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
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+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/nanobench/node_modules/chalk": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+      "integrity": "sha512-U3lRVLMSlsCfjqYPbLyVv11M9CPW4I728d6TCKMAOJueEeB9/8o+eSsMnxPJD+Q+K909sdESg7C+tIkoH6on1A==",
+      "dev": true,
+      "dependencies": {
+        "ansi-styles": "^2.2.1",
+        "escape-string-regexp": "^1.0.2",
+        "has-ansi": "^2.0.0",
+        "strip-ansi": "^3.0.0",
+        "supports-color": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/nanobench/node_modules/strip-ansi": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "integrity": "sha512-VhumSSbBqDTP8p2ZLKj40UjBCV4+v8bUSEpUb4KjRgWk9pbqGF4REFj6KEagidb2f/M6AzC0EmFyDNGaw9OCzg==",
+      "dev": true,
+      "dependencies": {
+        "ansi-regex": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
       }
     },
     "node_modules/nanobench/node_modules/supports-color": {
@@ -10994,6 +11690,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/pathval": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/pathval/-/pathval-1.1.1.tgz",
+      "integrity": "sha512-Dp6zGqpTdETdR63lehJYPeIOqpiNBNtc7BpWSLrOje7UaIsE5aY92r/AunQA7rsXvet3lrJ3JnZX29UPTKXyKQ==",
+      "dev": true,
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/pbkdf2": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/pbkdf2/-/pbkdf2-3.1.2.tgz",
@@ -13002,6 +13707,17 @@
         "safe-buffer": "~5.1.0"
       }
     },
+    "node_modules/readdir-enhanced": {
+      "version": "1.5.2",
+      "resolved": "https://registry.npmjs.org/readdir-enhanced/-/readdir-enhanced-1.5.2.tgz",
+      "integrity": "sha512-oncAoS9LLjy/+DeZfSAdZBI/iFJGcPCOp44RPFI6FIMHuxt5CC5P0cUZ9mET+EZB9ONhcEvAids/lVRkj0sTHw==",
+      "dev": true,
+      "dependencies": {
+        "call-me-maybe": "^1.0.1",
+        "es6-promise": "^4.1.0",
+        "glob-to-regexp": "^0.3.0"
+      }
+    },
     "node_modules/readdirp": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-2.2.1.tgz",
@@ -13706,6 +14422,15 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/serialize-javascript": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-6.0.0.tgz",
+      "integrity": "sha512-Qr3TosvguFt8ePWqsvRfrKyQXIiW+nGbYpy8XK24NQHE83caxWt+mIymTT19DGFbNWNLfEwsrkSmN64lVWB9ag==",
+      "dev": true,
+      "dependencies": {
+        "randombytes": "^2.1.0"
+      }
+    },
     "node_modules/serve-index": {
       "version": "1.9.1",
       "resolved": "https://registry.npmjs.org/serve-index/-/serve-index-1.9.1.tgz",
@@ -13978,6 +14703,12 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/sift": {
+      "version": "17.0.1",
+      "resolved": "https://registry.npmjs.org/sift/-/sift-17.0.1.tgz",
+      "integrity": "sha512-10rmPF5nuz5UdKuhhxgfS7Vz1aIRGmb+kn5Zy6bntCgNwkbZc0a7Z2dUw2Y9wSoRrBzf7Oim81SUsYdOkVnI8Q==",
+      "dev": true
+    },
     "node_modules/signal-exit": {
       "version": "3.0.7",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.7.tgz",
@@ -16384,6 +17115,15 @@
         "node": ">= 0.8.0"
       }
     },
+    "node_modules/type-detect": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+      "dev": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/type-fest": {
       "version": "0.8.1",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
@@ -17265,6 +18005,12 @@
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       "dev": true
     },
+    "node_modules/workerpool": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.2.1.tgz",
+      "integrity": "sha512-ILEIE97kDZvF9Wb9f6h5aXK4swSlKGUcOEGiIYb2OOu/IrDU9iwj0fD//SsA6E5ibwJxpEvhullJY4Sl4GcpAw==",
+      "dev": true
+    },
     "node_modules/wrap-ansi": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
@@ -17440,6 +18186,54 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/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,
+      "dependencies": {
+        "camelcase": "^6.0.0",
+        "decamelize": "^4.0.0",
+        "flat": "^5.0.2",
+        "is-plain-obj": "^2.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/yargs-unparser/node_modules/camelcase": {
+      "version": "6.3.0",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-6.3.0.tgz",
+      "integrity": "sha512-Gmy6FhYlCY7uOElZUSbxo2UCDH8owEk996gkbrpsgGtrJLM3J7jGxl9Ic7Qwwj4ivOE5AWZWRMecDdF7hqGjFA==",
+      "dev": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/yargs-unparser/node_modules/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,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/yargs-unparser/node_modules/is-plain-obj": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/is-plain-obj/-/is-plain-obj-2.1.0.tgz",
+      "integrity": "sha512-YWnfyRwxL/+SsrWYfOpUtz5b3YD+nyfkHvjbcanzk8zgyO4ASD67uVMRt8k5bM4lLMDnXfriRhOpemw+NfT1eA==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/yargs/node_modules/ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@@ -17618,6 +18412,18 @@
         "buffer-crc32": "~0.2.3"
       }
     },
+    "node_modules/yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/zwitch": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/zwitch/-/zwitch-1.0.5.tgz",
diff --git a/package.json b/package.json
index f96e8e3..193234a 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,8 @@
     "url": "https://github.com/spring-io/antora-ui-spring"
   },
   "scripts": {
-    "start": "gulp preview"
+    "start": "gulp preview",
+    "test": "_mocha"
   },
   "engines": {
     "node": ">=16.0.0"
@@ -25,6 +26,10 @@
     "autoprefixer": "~10.4",
     "browser-pack-flat": "~3.5",
     "browserify": "~17.0",
+    "chai": "~4.3",
+    "chai-fs": "~2.0",
+    "chai-spies": "~1.0",
+    "dirty-chai": "~2.0",
     "core-js": "~3.26",
     "cssnano": "~5.1",
     "eslint": "~6.8",
@@ -47,6 +52,7 @@
     "highlight.js": "9.18.3",
     "instantsearch.js": "^4.54.1",
     "js-yaml": "~4.1",
+    "mocha": "~10.2",
     "merge-stream": "~2.0",
     "micromodal": "^0.4.10",
     "postcss": "~8.4",
diff --git a/src/helpers/related_projects.js b/src/helpers/related_projects.js
index 2dde4ab..f4d3ee4 100644
--- a/src/helpers/related_projects.js
+++ b/src/helpers/related_projects.js
@@ -1,257 +1,26 @@
 'use strict'
 
-module.exports = (categories, projectIds) => relatedProjects(categories, projectIds)
+module.exports = (categories, projectIds, projects) => relatedProjects(categories, projectIds, projects)
 
-function relatedProjects (categories = [], projectIds = []) {
-  const projectDocumentation = [
-    {
-      href: 'https://docs.spring.io/spring-framework/reference/',
-      id: 'framework',
-      text: 'Spring Framework',
-      categories: ['core'],
-    },
-    {
-      text: 'Spring Cloud',
-      id: 'cloud',
-      categories: ['cloud'],
-      children: [
-        {
-          href: 'https://docs.spring.io/spring-cloud-build/reference/',
-          id: 'cloud-build',
-          text: 'Spring Cloud Build',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-bus/reference/',
-          id: 'cloud-bus',
-          text: 'Spring Cloud Bus',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-circuitbreaker/reference/',
-          id: 'cloud-circuitbreaker',
-          text: 'Spring Cloud Circuit Breaker',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-commons/reference/',
-          id: 'cloud-commons',
-          text: 'Spring Cloud Commons',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-config/reference/',
-          id: 'cloud-config',
-          text: 'Spring Cloud Config',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-consul/reference/',
-          id: 'cloud-consul',
-          text: 'Spring Cloud Consul',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-contract/reference/',
-          id: 'cloud-contract',
-          text: 'Spring Cloud Contract',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-function/reference/',
-          id: 'cloud-function',
-          text: 'Spring Cloud Function',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-gateway/reference/',
-          id: 'cloud-gateway',
-          text: 'Spring Cloud Gateway',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-kubernetes/reference/',
-          id: 'cloud-kubernetes',
-          text: 'Spring Cloud Kubernetes',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-netflix/reference/',
-          id: 'cloud-netflix',
-          text: 'Spring Cloud Netflix',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-openfeign/reference/',
-          id: 'cloud-openfeign',
-          text: 'Spring Cloud OpenFeign',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-stream/reference/',
-          id: 'cloud-stream',
-          text: 'Spring Cloud Stream',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-task/reference/',
-          id: 'cloud-task',
-          text: 'Spring Cloud Task',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-vault/reference/',
-          id: 'cloud-vault',
-          text: 'Spring Cloud Vault',
-          categories: ['cloud'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-cloud-zookeeper/reference/',
-          id: 'cloud-zookeeper',
-          text: 'Spring Cloud Zookeeper',
-          categories: ['cloud'],
-        },
-      ],
-    },
-    {
-      text: 'Spring Data',
-      id: 'data',
-      categories: ['data'],
-      children: [
-        {
-          href: 'https://docs.spring.io/spring-data/cassandra/reference/',
-          id: 'data/cassandra',
-          text: 'Spring Data Cassandra',
-          categories: ['data'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-data/commons/reference/',
-          id: 'data/commons',
-          text: 'Spring Data Commons',
-          categories: ['data'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-data/couchbase/reference/',
-          id: 'data/couchbase',
-          text: 'Spring Data Couchbase',
-          categories: ['data'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-data/elasticsearch/reference/',
-          id: 'data/elasticsearch',
-          text: 'Spring Data Elasticsearch',
-          categories: ['data'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-data/jpa/reference/',
-          id: 'data/jpa',
-          text: 'Spring Data JPA',
-          categories: ['data'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-data/keyvalue/reference/',
-          id: 'data/keyvalue',
-          text: 'Spring Data KeyValue',
-          categories: ['data'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-data/ldap/reference/',
-          id: 'data/ldap',
-          text: 'Spring Data LDAP',
-          categories: ['data'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-data/mongodb/reference/',
-          id: 'data/mongodb',
-          text: 'Spring Data MongoDB',
-          categories: ['data'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-data/neo4j/reference/',
-          id: 'data/neo4j',
-          text: 'Spring Data Neo4j',
-          categories: ['data'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-data/redis/reference/',
-          id: 'data/redis',
-          text: 'Spring Data Redis',
-          categories: ['data'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-data/relational/reference/',
-          id: 'data/relational',
-          text: 'Spring Data JDBC & R2DBC',
-          categories: ['data'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-data/rest/reference/',
-          id: 'data/rest',
-          text: 'Spring Data REST',
-          categories: ['data'],
-        },
-      ],
-    },
-    { href: 'https://docs.spring.io/spring-integration/reference/', id: 'integration', text: 'Spring Integration' },
-    { href: 'https://docs.spring.io/spring-batch/reference/', id: 'batch', text: 'Spring Batch' },
-    {
-      href: 'https://docs.spring.io/spring-security/reference/',
-      id: 'security',
-      text: 'Spring Security',
-      categories: ['security', 'core'],
-      children: [
-        {
-          href: 'https://docs.spring.io/spring-authorization-server/reference/',
-          id: 'authorization-server',
-          text: 'Spring Authorization Server',
-          categories: ['security'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-ldap/reference/',
-          id: 'ldap',
-          text: 'Spring LDAP',
-          categories: ['security'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-security-kerberos/reference/',
-          id: 'security-kerberos',
-          text: 'Spring Security Kerberos',
-          categories: ['security'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-session/reference/',
-          id: 'session',
-          text: 'Spring Session',
-          categories: ['security'],
-        },
-        {
-          href: 'https://docs.spring.io/spring-vault/reference/',
-          id: 'vault',
-          text: 'Spring Vault',
-          categories: ['security'],
-        },
-      ],
-    },
-    { href: 'https://docs.spring.io/spring-ai/reference/', id: 'ai', text: 'Spring AI' },
-    { href: 'https://docs.spring.io/spring-cli/reference/', id: 'cli', text: 'Spring CLI' },
-    { href: 'https://docs.spring.io/spring-graphql/reference/', id: 'graphql', text: 'Spring GraphQL' },
-    { href: 'https://docs.spring.io/spring-kafka/reference/', id: 'kafka', text: 'Spring for Apache Kafka' },
-    { href: 'https://docs.spring.io/spring-modulith/reference/', id: 'modulith', text: 'Spring Modulith' },
-    { href: 'https://docs.spring.io/spring-pulsar/reference/', id: 'pulsar', text: 'Spring for Apache Pulsar' },
-    { href: 'https://docs.spring.io/spring-shell/reference/', id: 'shell', text: 'Spring Shell' },
-  ]
-  return projectDocumentation.filter(
-    (p) => filterProjectByCategories(p, categories) || filterProjectByProjectIds(p, projectIds)
+function relatedProjects (categories, projectIds, projects) {
+  if (categories.length === 0 && projectIds.length === 0) {
+    return projects
+  }
+  const result = projects.filter(
+    (project) => filterProjectByCategories(project, categories) || filterProjectByProjectIds(project, projectIds)
   )
+  for (const project of result) {
+    if (project.children) {
+      project.children = relatedProjects(categories, projectIds, project.children)
+    }
+  }
+  return result
 }
 
 function filterProjectByCategories (project, categories) {
-  return (
-    categories.length === 0 ||
-    categories.some((category) => project.categories && project.categories.includes(category))
-  )
+  return project.categories && categories.some((category) => project.categories.includes(category))
 }
 
 function filterProjectByProjectIds (project, projectIds) {
-  return projectIds.length === 0 || projectIds.some((projectId) => project.id === projectId)
+  return projectIds.some((projectId) => project.id === projectId)
 }
diff --git a/src/helpers/spring-projects.js b/src/helpers/spring-projects.js
new file mode 100644
index 0000000..8e2fe74
--- /dev/null
+++ b/src/helpers/spring-projects.js
@@ -0,0 +1,239 @@
+'use strict'
+
+module.exports = () => [
+  {
+    href: 'https://docs.spring.io/spring-framework/reference/',
+    id: 'framework',
+    text: 'Spring Framework',
+    categories: ['core'],
+  },
+  {
+    text: 'Spring Cloud',
+    id: 'cloud',
+    categories: ['cloud'],
+    children: [
+      {
+        href: 'https://docs.spring.io/spring-cloud-build/reference/',
+        id: 'cloud-build',
+        text: 'Spring Cloud Build',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-bus/reference/',
+        id: 'cloud-bus',
+        text: 'Spring Cloud Bus',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-circuitbreaker/reference/',
+        id: 'cloud-circuitbreaker',
+        text: 'Spring Cloud Circuit Breaker',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-commons/reference/',
+        id: 'cloud-commons',
+        text: 'Spring Cloud Commons',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-config/reference/',
+        id: 'cloud-config',
+        text: 'Spring Cloud Config',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-consul/reference/',
+        id: 'cloud-consul',
+        text: 'Spring Cloud Consul',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-contract/reference/',
+        id: 'cloud-contract',
+        text: 'Spring Cloud Contract',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-function/reference/',
+        id: 'cloud-function',
+        text: 'Spring Cloud Function',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-gateway/reference/',
+        id: 'cloud-gateway',
+        text: 'Spring Cloud Gateway',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-kubernetes/reference/',
+        id: 'cloud-kubernetes',
+        text: 'Spring Cloud Kubernetes',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-netflix/reference/',
+        id: 'cloud-netflix',
+        text: 'Spring Cloud Netflix',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-openfeign/reference/',
+        id: 'cloud-openfeign',
+        text: 'Spring Cloud OpenFeign',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-stream/reference/',
+        id: 'cloud-stream',
+        text: 'Spring Cloud Stream',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-task/reference/',
+        id: 'cloud-task',
+        text: 'Spring Cloud Task',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-vault/reference/',
+        id: 'cloud-vault',
+        text: 'Spring Cloud Vault',
+        categories: ['cloud'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-cloud-zookeeper/reference/',
+        id: 'cloud-zookeeper',
+        text: 'Spring Cloud Zookeeper',
+        categories: ['cloud'],
+      },
+    ],
+  },
+  {
+    text: 'Spring Data',
+    id: 'data',
+    categories: ['data'],
+    children: [
+      {
+        href: 'https://docs.spring.io/spring-data/cassandra/reference/',
+        id: 'data/cassandra',
+        text: 'Spring Data Cassandra',
+        categories: ['data'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-data/commons/reference/',
+        id: 'data/commons',
+        text: 'Spring Data Commons',
+        categories: ['data'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-data/couchbase/reference/',
+        id: 'data/couchbase',
+        text: 'Spring Data Couchbase',
+        categories: ['data'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-data/elasticsearch/reference/',
+        id: 'data/elasticsearch',
+        text: 'Spring Data Elasticsearch',
+        categories: ['data'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-data/jpa/reference/',
+        id: 'data/jpa',
+        text: 'Spring Data JPA',
+        categories: ['data'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-data/keyvalue/reference/',
+        id: 'data/keyvalue',
+        text: 'Spring Data KeyValue',
+        categories: ['data'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-data/ldap/reference/',
+        id: 'data/ldap',
+        text: 'Spring Data LDAP',
+        categories: ['data'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-data/mongodb/reference/',
+        id: 'data/mongodb',
+        text: 'Spring Data MongoDB',
+        categories: ['data'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-data/neo4j/reference/',
+        id: 'data/neo4j',
+        text: 'Spring Data Neo4j',
+        categories: ['data'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-data/redis/reference/',
+        id: 'data/redis',
+        text: 'Spring Data Redis',
+        categories: ['data'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-data/relational/reference/',
+        id: 'data/relational',
+        text: 'Spring Data JDBC & R2DBC',
+        categories: ['data'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-data/rest/reference/',
+        id: 'data/rest',
+        text: 'Spring Data REST',
+        categories: ['data'],
+      },
+    ],
+  },
+  { href: 'https://docs.spring.io/spring-integration/reference/', id: 'integration', text: 'Spring Integration' },
+  { href: 'https://docs.spring.io/spring-batch/reference/', id: 'batch', text: 'Spring Batch' },
+  {
+    href: 'https://docs.spring.io/spring-security/reference/',
+    id: 'security',
+    text: 'Spring Security',
+    categories: ['security', 'core'],
+    children: [
+      {
+        href: 'https://docs.spring.io/spring-authorization-server/reference/',
+        id: 'authorization-server',
+        text: 'Spring Authorization Server',
+        categories: ['security'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-ldap/reference/',
+        id: 'ldap',
+        text: 'Spring LDAP',
+        categories: ['security'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-security-kerberos/reference/',
+        id: 'security-kerberos',
+        text: 'Spring Security Kerberos',
+        categories: ['security'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-session/reference/',
+        id: 'session',
+        text: 'Spring Session',
+        categories: ['security'],
+      },
+      {
+        href: 'https://docs.spring.io/spring-vault/reference/',
+        id: 'vault',
+        text: 'Spring Vault',
+        categories: ['security'],
+      },
+    ],
+  },
+  { href: 'https://docs.spring.io/spring-ai/reference/', id: 'ai', text: 'Spring AI' },
+  { href: 'https://docs.spring.io/spring-cli/reference/', id: 'cli', text: 'Spring CLI' },
+  { href: 'https://docs.spring.io/spring-graphql/reference/', id: 'graphql', text: 'Spring GraphQL' },
+  { href: 'https://docs.spring.io/spring-kafka/reference/', id: 'kafka', text: 'Spring for Apache Kafka' },
+  { href: 'https://docs.spring.io/spring-modulith/reference/', id: 'modulith', text: 'Spring Modulith' },
+  { href: 'https://docs.spring.io/spring-pulsar/reference/', id: 'pulsar', text: 'Spring for Apache Pulsar' },
+  { href: 'https://docs.spring.io/spring-shell/reference/', id: 'shell', text: 'Spring Shell' },
+]
diff --git a/src/partials/article-spring-projects.hbs b/src/partials/article-spring-projects.hbs
index 9996e55..e9408e1 100644
--- a/src/partials/article-spring-projects.hbs
+++ b/src/partials/article-spring-projects.hbs
@@ -5,7 +5,7 @@
   <div class="container">
     <h1 id="page-title" class="page">Spring Projects</h1>
     <ul class="projects-list">
-      {{#each (related_projects [''] [''])}}
+      {{#each (related_projects [''] [''] (spring-projects))}}
         {{> related-project this}}
       {{/each}}
     </ul>
diff --git a/src/partials/related-projects.hbs b/src/partials/related-projects.hbs
index d2c8ccc..71192ed 100644
--- a/src/partials/related-projects.hbs
+++ b/src/partials/related-projects.hbs
@@ -2,7 +2,7 @@
   <li>
     Related Spring Documentation
     <ul class="projects-list">
-      {{#each (related_projects (split page.attributes.related-doc-categories) (split page.attributes.related-doc-projects))}}
+      {{#each (related_projects (split page.attributes.related-doc-categories) (split page.attributes.related-doc-projects) (spring-projects))}}
         {{> related-project this}}
       {{/each}}
     </ul>
diff --git a/test/harness/index.js b/test/harness/index.js
new file mode 100644
index 0000000..1e0105c
--- /dev/null
+++ b/test/harness/index.js
@@ -0,0 +1,89 @@
+/* eslint-env mocha */
+'use strict'
+
+process.env.NODE_ENV = 'test'
+
+const chai = require('chai')
+const fsp = require('node:fs/promises')
+const http = require('http')
+const ospath = require('path')
+const { once } = require('events')
+
+chai.use(require('chai-fs'))
+chai.use(require('chai-spies'))
+// dirty-chai must be loaded after the other plugins
+// see https://github.com/prodatakey/dirty-chai#plugin-assertions
+chai.use(require('dirty-chai'))
+
+const cleanDir = (dir, { create } = {}) =>
+  fsp.rm(dir, { recursive: true, force: true }).then(() => (create ? fsp.mkdir(dir, { recursive: true }) : undefined))
+
+const filterLines = (str, predicate) => str.split('\n').filter(predicate).join('\n')
+
+const heredoc = (literals, ...vals) => {
+  const str = literals
+    .reduce((accum, chunk, idx) => {
+      if (!idx) return [chunk]
+      let val = vals[idx - 1]
+      let match
+      const last = accum[accum.length - 1]
+      if (last.charAt(last.length - 1) === ' ' && (match = /\n( +)$/.exec(last))) {
+        const indent = match[1]
+        const valLines = val.split(/^/m)
+        if (valLines.length > 1) val = valLines.map((l, i) => (i ? indent + l : l)).join('')
+      }
+      return accum.concat(val, chunk)
+    }, undefined)
+    .join('')
+    .trimEnd()
+  let lines = str.split(/^/m)
+  if (lines[0] === '\n') lines = lines.slice(1)
+  if (lines.length < 2) return str // discourage use of heredoc in this case
+  const last = lines.pop()
+  if (last != null) {
+    lines.push(last[last.length - 1] === '\\' && last[last.length - 2] === ' ' ? last.slice(0, -2) + '\n' : last)
+  }
+  const indentRx = /^ +/
+  const indentSize = Math.min(...lines.filter((l) => l.charAt() === ' ').map((l) => l.match(indentRx)[0].length))
+  return (indentSize ? lines.map((l) => (l.charAt() === ' ' ? l.slice(indentSize) : l)) : lines).join('')
+}
+
+const startWebServer = (hostname, rootDir) => {
+  const contentTypes = {}
+  const handler = {
+    delegate: (request, response) => {
+      fsp.readFile(ospath.join(rootDir, request.url)).then(
+        (content) => {
+          const ext = ospath.extname(request.url)
+          response.writeHead(200, { 'Content-Type': contentTypes[ext] || `application/${ext.slice(1)}` })
+          response.end(content)
+        },
+        () => {
+          response.writeHead(404, { 'Content-Type': 'text/html' })
+          response.end('<!DOCTYPE html><html><body>Not Found</body></html>', 'utf8')
+        }
+      )
+    },
+  }
+  const httpServer = http.createServer((request, response) => handler.delegate(request, response))
+  return once(httpServer.listen(0), 'listening').then(() => {
+    httpServer.shutdown = function () {
+      return once(this.close() || this, 'close')
+    }.bind(httpServer)
+    httpServer.handler = function (h) {
+      handler.delegate = h
+    }
+    return [httpServer, new URL(`http://${hostname}:${httpServer.address().port}`).toString().slice(0, -1)]
+  })
+}
+
+// NOTE async keyword only needed on fn declaration if the function it calls does not always return a Promise
+const trapAsyncError = (fn, ...args) =>
+  fn(...args).then(
+    (returnValue) => () => returnValue,
+    (err) => () => {
+      throw err
+    }
+  )
+
+module.exports = { cleanDir, expect: chai.expect, filterLines, heredoc, spy: chai.spy, startWebServer, trapAsyncError }
diff --git a/test/harness/mocha/ci-reporter.js b/test/harness/mocha/ci-reporter.js
new file mode 100644
index 0000000..c8bcf58
--- /dev/null
+++ b/test/harness/mocha/ci-reporter.js
@@ -0,0 +1,14 @@
+'use strict'
+
+const { Base, Dot, XUnit } = require('mocha').reporters
+
+// A Mocha reporter that combines the dot and xunit reporters.
+class CI extends Base {
+  constructor (runner, options) {
+    super(runner, options)
+    new Dot(runner, options) // eslint-disable-line no-new
+    new XUnit(runner, options) // eslint-disable-line no-new
+  }
+}
+
+module.exports = CI
diff --git a/test/harness/mocha/config.js b/test/harness/mocha/config.js
new file mode 100644
index 0000000..2a37ff2
--- /dev/null
+++ b/test/harness/mocha/config.js
@@ -0,0 +1,39 @@
+'use strict'
+
+const config = {
+  checkLeaks: true,
+  globals: ['__coverage__'], // we know __coverage__ is global, so no need to check
+  mochaGlobalTeardown () {
+    if (!this.failures) logCoverageReportPath()
+  },
+  require: __filename,
+  spec: resolveSpec(),
+  timeout: 10 * 60 * 1000,
+}
+
+if (process.env.npm_config_watch) config.watch = true
+if (process.env.CI) {
+  Object.assign(config, {
+    forbidOnly: true,
+    reporter: './test/harness/mocha/ci-reporter',
+    'reporter-option': ['output=reports/tests-xunit.xml'],
+  })
+}
+
+function logCoverageReportPath () {
+  if (!process.env.NYC_PROCESS_ID) return
+  const { CI_PROJECT_PATH, CI_JOB_ID } = process.env
+  const coverageReportRelpath = 'reports/lcov-report/index.html'
+  const coverageReportURL = CI_JOB_ID
+    ? `https://gitlab.com/${CI_PROJECT_PATH}/-/jobs/${CI_JOB_ID}/artifacts/file/${coverageReportRelpath}`
+    : require('node:url').pathToFileURL(coverageReportRelpath)
+  console.log(`Coverage report: ${coverageReportURL}`)
+}
+
+function resolveSpec () {
+  const spec = process.argv[2]
+  if (spec && !spec.startsWith('-')) return spec
+  return 'test/**/*-test.js'
+}
+
+module.exports = config
diff --git a/test/related_projects-test.js b/test/related_projects-test.js
new file mode 100644
index 0000000..0bc7e5c
--- /dev/null
+++ b/test/related_projects-test.js
@@ -0,0 +1,103 @@
+/* eslint-env mocha */
+'use strict'
+
+const { expect } = require('./harness')
+const relatedProjects = require('../src/helpers/related_projects.js')
+
+describe('related_projects', () => {
+  const projects = [
+    project('framework', {
+      categories: ['core'],
+    }),
+    project('security', {
+      categories: ['security'],
+      children: [
+        project('session', {
+          categories: ['security'],
+        }),
+      ],
+    }),
+  ]
+
+  it('projects categories and projectIds empty returns all results', () => {
+    const projectIds = relatedProjectIds([], [], projects)
+    expect(projectIds).is.eql(['framework', 'security', 'session'])
+  })
+
+  it('projectsIds empty and categories specified returns only categories', () => {
+    const projectIds = relatedProjectIds(['security'], [''], projects)
+    expect(projectIds).is.eql(['security', 'session'])
+  })
+
+  it('projectsIds specified and categories empty returns only ids', () => {
+    const projectIds = relatedProjectIds([], ['framework'], projects)
+    expect(projectIds).is.eql(['framework'])
+  })
+
+  it('project id is substring', () => {
+    const projects = [
+      project('cloud', {
+        categories: ['cloud'],
+        children: [
+          project('cloud-stream', {
+            categories: ['cloud'],
+          }),
+          project('cloud-gateway', {
+            categories: ['cloud'],
+          }),
+        ],
+      }),
+    ]
+    const projectIds = relatedProjectIds([], ['cloud', 'cloud-stream'], projects)
+    expect(projectIds).is.eql(['cloud', 'cloud-stream'])
+  })
+
+  it('children not included if parent is not', () => {
+    const projects = [
+      project('cloud', {
+        categories: ['cloud'],
+        children: [
+          project('cloud-stream', {
+            categories: ['cloud'],
+          }),
+          project('cloud-gateway', {
+            categories: ['cloud'],
+          }),
+        ],
+      }),
+    ]
+    const projectIds = relatedProjectIds([], ['cloud-stream'], projects)
+    expect(projectIds).is.eql([])
+  })
+
+  it('categories defined but project.categories is null', () => {
+    const projects = [
+      project('cloud', { categories: ['cloud'] }),
+      project('spring-integration'),
+    ]
+    const projectIds = relatedProjectIds(['cloud'], [''], projects)
+    expect(projectIds).is.eql(['cloud'])
+  })
+})
+
+function project (id, attrs) {
+  return { href: `https://docs.spring.io/spring-${id}/reference/`, ...attrs, id: id, text: `Spring ${id}` }
+}
+
+function relatedProjectIds (categories, projectIds, projects) {
+  return collectIdsForProjects(relatedProjects(categories, projectIds, projects))
+}
+
+function collectIdsForProjects (projects, results = []) {
+  for (const p of projects) {
+    collectIds(p, results)
+  }
+  return results
+}
+
+function collectIds (p, results) {
+  results.push(p.id)
+  if (p.children) {
+    collectIdsForProjects(p.children, results)
+  }
+}