diff --git a/.github/workflows/build-deploy.yml b/.github/workflows/build-deploy.yml
index 72ad40d..8b9cb8b 100644
--- a/.github/workflows/build-deploy.yml
+++ b/.github/workflows/build-deploy.yml
@@ -44,6 +44,9 @@ jobs:
       - name: Install dependencies
         run: composer install --prefer-dist --no-progress
 
+      - name: Run PHPUnit tests
+        run: vendor/bin/phpunit
+
       - name: Run Ata's SSG HTML Builder
         uses: atas/ssg-html-builder-action@2.2
         with:
diff --git a/composer.json b/composer.json
index 0cf26b6..b9718c6 100644
--- a/composer.json
+++ b/composer.json
@@ -16,5 +16,8 @@
     "platform": {
       "php": "7.4.0"
     }
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^9.6"
   }
 }
diff --git a/composer.lock b/composer.lock
index 8417ffa..b9e85c6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "b843517f938abc9037b9d1e07de6d0fb",
+    "content-hash": "da22f8ba7dfb075dcc5ffcac6a268ac4",
     "packages": [
         {
             "name": "dflydev/dot-access-data",
@@ -775,7 +775,1740 @@
             "time": "2023-04-23T19:33:36+00:00"
         }
     ],
-    "packages-dev": [],
+    "packages-dev": [
+        {
+            "name": "doctrine/instantiator",
+            "version": "1.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/instantiator.git",
+                "reference": "0a0fa9780f5d4e507415a065172d26a98d02047b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/0a0fa9780f5d4e507415a065172d26a98d02047b",
+                "reference": "0a0fa9780f5d4e507415a065172d26a98d02047b",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "require-dev": {
+                "doctrine/coding-standard": "^9 || ^11",
+                "ext-pdo": "*",
+                "ext-phar": "*",
+                "phpbench/phpbench": "^0.16 || ^1",
+                "phpstan/phpstan": "^1.4",
+                "phpstan/phpstan-phpunit": "^1",
+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5",
+                "vimeo/psalm": "^4.30 || ^5.4"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Marco Pivetta",
+                    "email": "ocramius@gmail.com",
+                    "homepage": "https://ocramius.github.io/"
+                }
+            ],
+            "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
+            "homepage": "https://www.doctrine-project.org/projects/instantiator.html",
+            "keywords": [
+                "constructor",
+                "instantiate"
+            ],
+            "support": {
+                "issues": "https://github.com/doctrine/instantiator/issues",
+                "source": "https://github.com/doctrine/instantiator/tree/1.5.0"
+            },
+            "funding": [
+                {
+                    "url": "https://www.doctrine-project.org/sponsorship.html",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.patreon.com/phpdoctrine",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Finstantiator",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-12-30T00:15:36+00:00"
+        },
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.11.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "7284c22080590fb39f2ffa3e9057f10a4ddd0e0c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/7284c22080590fb39f2ffa3e9057f10a4ddd0e0c",
+                "reference": "7284c22080590fb39f2ffa3e9057f10a4ddd0e0c",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "conflict": {
+                "doctrine/collections": "<1.6.8",
+                "doctrine/common": "<2.13.3 || >=3,<3.2.2"
+            },
+            "require-dev": {
+                "doctrine/collections": "^1.6.8",
+                "doctrine/common": "^2.13.3 || ^3.2.2",
+                "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ],
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.11.1"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-03-08T13:26:56+00:00"
+        },
+        {
+            "name": "nikic/php-parser",
+            "version": "v4.17.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nikic/PHP-Parser.git",
+                "reference": "a6303e50c90c355c7eeee2c4a8b27fe8dc8fef1d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/a6303e50c90c355c7eeee2c4a8b27fe8dc8fef1d",
+                "reference": "a6303e50c90c355c7eeee2c4a8b27fe8dc8fef1d",
+                "shasum": ""
+            },
+            "require": {
+                "ext-tokenizer": "*",
+                "php": ">=7.0"
+            },
+            "require-dev": {
+                "ircmaxell/php-yacc": "^0.0.7",
+                "phpunit/phpunit": "^6.5 || ^7.0 || ^8.0 || ^9.0"
+            },
+            "bin": [
+                "bin/php-parse"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.9-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PhpParser\\": "lib/PhpParser"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Nikita Popov"
+                }
+            ],
+            "description": "A PHP parser written in PHP",
+            "keywords": [
+                "parser",
+                "php"
+            ],
+            "support": {
+                "issues": "https://github.com/nikic/PHP-Parser/issues",
+                "source": "https://github.com/nikic/PHP-Parser/tree/v4.17.1"
+            },
+            "time": "2023-08-13T19:53:39+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "2.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "97803eca37d319dfa7826cc2437fc020857acb53"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/97803eca37d319dfa7826cc2437fc020857acb53",
+                "reference": "97803eca37d319dfa7826cc2437fc020857acb53",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-phar": "*",
+                "ext-xmlwriter": "*",
+                "phar-io/version": "^3.0.1",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "support": {
+                "issues": "https://github.com/phar-io/manifest/issues",
+                "source": "https://github.com/phar-io/manifest/tree/2.0.3"
+            },
+            "time": "2021-07-20T11:28:43+00:00"
+        },
+        {
+            "name": "phar-io/version",
+            "version": "3.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/3.2.1"
+            },
+            "time": "2022-02-21T01:04:05+00:00"
+        },
+        {
+            "name": "phpunit/php-code-coverage",
+            "version": "9.2.29",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
+                "reference": "6a3a87ac2bbe33b25042753df8195ba4aa534c76"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/6a3a87ac2bbe33b25042753df8195ba4aa534c76",
+                "reference": "6a3a87ac2bbe33b25042753df8195ba4aa534c76",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-libxml": "*",
+                "ext-xmlwriter": "*",
+                "nikic/php-parser": "^4.15",
+                "php": ">=7.3",
+                "phpunit/php-file-iterator": "^3.0.3",
+                "phpunit/php-text-template": "^2.0.2",
+                "sebastian/code-unit-reverse-lookup": "^2.0.2",
+                "sebastian/complexity": "^2.0",
+                "sebastian/environment": "^5.1.2",
+                "sebastian/lines-of-code": "^1.0.3",
+                "sebastian/version": "^3.0.1",
+                "theseer/tokenizer": "^1.2.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
+            },
+            "suggest": {
+                "ext-pcov": "PHP extension that provides line coverage",
+                "ext-xdebug": "PHP extension that provides line coverage as well as branch and path coverage"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "9.2-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that provides collection, processing, and rendering functionality for PHP code coverage information.",
+            "homepage": "https://github.com/sebastianbergmann/php-code-coverage",
+            "keywords": [
+                "coverage",
+                "testing",
+                "xunit"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-code-coverage/issues",
+                "security": "https://github.com/sebastianbergmann/php-code-coverage/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/9.2.29"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-09-19T04:57:46+00:00"
+        },
+        {
+            "name": "phpunit/php-file-iterator",
+            "version": "3.0.6",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
+                "reference": "cf1c2e7c203ac650e352f4cc675a7021e7d1b3cf"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/cf1c2e7c203ac650e352f4cc675a7021e7d1b3cf",
+                "reference": "cf1c2e7c203ac650e352f4cc675a7021e7d1b3cf",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "FilterIterator implementation that filters files based on a list of suffixes.",
+            "homepage": "https://github.com/sebastianbergmann/php-file-iterator/",
+            "keywords": [
+                "filesystem",
+                "iterator"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-file-iterator/issues",
+                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/3.0.6"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-12-02T12:48:52+00:00"
+        },
+        {
+            "name": "phpunit/php-invoker",
+            "version": "3.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-invoker.git",
+                "reference": "5a10147d0aaf65b58940a0b72f71c9ac0423cc67"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-invoker/zipball/5a10147d0aaf65b58940a0b72f71c9ac0423cc67",
+                "reference": "5a10147d0aaf65b58940a0b72f71c9ac0423cc67",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "ext-pcntl": "*",
+                "phpunit/phpunit": "^9.3"
+            },
+            "suggest": {
+                "ext-pcntl": "*"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Invoke callables with a timeout",
+            "homepage": "https://github.com/sebastianbergmann/php-invoker/",
+            "keywords": [
+                "process"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-invoker/issues",
+                "source": "https://github.com/sebastianbergmann/php-invoker/tree/3.1.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-09-28T05:58:55+00:00"
+        },
+        {
+            "name": "phpunit/php-text-template",
+            "version": "2.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-text-template.git",
+                "reference": "5da5f67fc95621df9ff4c4e5a84d6a8a2acf7c28"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-text-template/zipball/5da5f67fc95621df9ff4c4e5a84d6a8a2acf7c28",
+                "reference": "5da5f67fc95621df9ff4c4e5a84d6a8a2acf7c28",
+                "shasum": ""
+            },
+            "require": {
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+            "require-dev": {
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+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0-dev"
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+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Simple template engine.",
+            "homepage": "https://github.com/sebastianbergmann/php-text-template/",
+            "keywords": [
+                "template"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-text-template/issues",
+                "source": "https://github.com/sebastianbergmann/php-text-template/tree/2.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-10-26T05:33:50+00:00"
+        },
+        {
+            "name": "phpunit/php-timer",
+            "version": "5.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-timer.git",
+                "reference": "5a63ce20ed1b5bf577850e2c4e87f4aa902afbd2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/5a63ce20ed1b5bf577850e2c4e87f4aa902afbd2",
+                "reference": "5a63ce20ed1b5bf577850e2c4e87f4aa902afbd2",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "5.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Utility class for timing",
+            "homepage": "https://github.com/sebastianbergmann/php-timer/",
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+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Snapshotting of global state",
+            "homepage": "http://www.github.com/sebastianbergmann/global-state",
+            "keywords": [
+                "global state"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/global-state/issues",
+                "source": "https://github.com/sebastianbergmann/global-state/tree/5.0.6"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-08-02T09:26:13+00:00"
+        },
+        {
+            "name": "sebastian/lines-of-code",
+            "version": "1.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/lines-of-code.git",
+                "reference": "c1c2e997aa3146983ed888ad08b15470a2e22ecc"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/lines-of-code/zipball/c1c2e997aa3146983ed888ad08b15470a2e22ecc",
+                "reference": "c1c2e997aa3146983ed888ad08b15470a2e22ecc",
+                "shasum": ""
+            },
+            "require": {
+                "nikic/php-parser": "^4.6",
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library for counting the lines of code in PHP source code",
+            "homepage": "https://github.com/sebastianbergmann/lines-of-code",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/lines-of-code/issues",
+                "source": "https://github.com/sebastianbergmann/lines-of-code/tree/1.0.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-28T06:42:11+00:00"
+        },
+        {
+            "name": "sebastian/object-enumerator",
+            "version": "4.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
+                "reference": "5c9eeac41b290a3712d88851518825ad78f45c71"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/5c9eeac41b290a3712d88851518825ad78f45c71",
+                "reference": "5c9eeac41b290a3712d88851518825ad78f45c71",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3",
+                "sebastian/object-reflector": "^2.0",
+                "sebastian/recursion-context": "^4.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/4.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-10-26T13:12:34+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "2.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "b4f479ebdbf63ac605d183ece17d8d7fe49c15c7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/b4f479ebdbf63ac605d183ece17d8d7fe49c15c7",
+                "reference": "b4f479ebdbf63ac605d183ece17d8d7fe49c15c7",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/2.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-10-26T13:14:26+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "4.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "e75bd0f07204fec2a0af9b0f3cfe97d05f92efc1"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/e75bd0f07204fec2a0af9b0f3cfe97d05f92efc1",
+                "reference": "e75bd0f07204fec2a0af9b0f3cfe97d05f92efc1",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "https://github.com/sebastianbergmann/recursion-context",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/4.0.5"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-02-03T06:07:39+00:00"
+        },
+        {
+            "name": "sebastian/resource-operations",
+            "version": "3.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/resource-operations.git",
+                "reference": "0f4443cb3a1d92ce809899753bc0d5d5a8dd19a8"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/0f4443cb3a1d92ce809899753bc0d5d5a8dd19a8",
+                "reference": "0f4443cb3a1d92ce809899753bc0d5d5a8dd19a8",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Provides a list of PHP built-in functions that operate on resources",
+            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/resource-operations/issues",
+                "source": "https://github.com/sebastianbergmann/resource-operations/tree/3.0.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-09-28T06:45:17+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "3.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "75e2c2a32f5e0b3aef905b9ed0b179b953b3d7c7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/75e2c2a32f5e0b3aef905b9ed0b179b953b3d7c7",
+                "reference": "75e2c2a32f5e0b3aef905b9ed0b179b953b3d7c7",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.2-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "source": "https://github.com/sebastianbergmann/type/tree/3.2.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-02-03T06:13:03+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "3.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "c6c1022351a901512170118436c764e473f6de8c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/c6c1022351a901512170118436c764e473f6de8c",
+                "reference": "c6c1022351a901512170118436c764e473f6de8c",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "source": "https://github.com/sebastianbergmann/version/tree/3.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-09-28T06:39:44+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/34a41e998c2183e22995f158c581e7b5e755ab9e",
+                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-07-28T10:34:58+00:00"
+        }
+    ],
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": [],
diff --git a/index.php b/index.php
index f00a8ca..685b4e5 100644
--- a/index.php
+++ b/index.php
@@ -1,5 +1,7 @@
 <?php
 
+use Atas\SsgSystemPhp\PostsCache;
+
 require_once "system/bootstrap.php";
 
 global $page_meta;
@@ -7,7 +9,7 @@
 
 require_once 'layout/header.php';
 
-$posts = updateAndGetCachedPostList();
+$posts = (new PostsCache())->updateAndGetCachedPostList();
 
 echo "<div id='posts'>";
 foreach ($posts as $post) {
diff --git a/layout/header.php b/layout/header.php
index 1f36f12..4dd8fa1 100644
--- a/layout/header.php
+++ b/layout/header.php
@@ -2,6 +2,13 @@
 require_once __DIR__ . "/../system/layoutUtils.php";
 
 global $config;
+
+use function Atas\SsgSystemPhp\get_email_parts_in_js;
+use function Atas\SsgSystemPhp\getCurrentFullUrl;
+use function Atas\SsgSystemPhp\GetProcessedPageMeta;
+use function Atas\SsgSystemPhp\isBuildRunning;
+use function Atas\SsgSystemPhp\selectedTabCss;
+
 $processed_meta = GetProcessedPageMeta();
 
 ?>
diff --git a/page.php b/page.php
index d73962b..441262d 100644
--- a/page.php
+++ b/page.php
@@ -1,4 +1,8 @@
 <?php
+
+use function Atas\SsgSystemPhp\exit_with_not_found;
+use function Atas\SsgSystemPhp\get_markdown;
+
 include "system/bootstrap.php";
 global $page_meta;
 
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..550968e
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit bootstrap="vendor/autoload.php"
+         colors="true"
+         verbose="true"
+         stopOnFailure="false">
+    <testsuites>
+        <testsuite name="Application Test Suite">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>
diff --git a/post.php b/post.php
index b636c15..160559e 100644
--- a/post.php
+++ b/post.php
@@ -1,5 +1,9 @@
 <?php
 
+use Atas\SsgSystemPhp\PostsCache;
+use function Atas\SsgSystemPhp\exit_with_not_found;
+use function Atas\SsgSystemPhp\get_markdown;
+
 require_once "system/bootstrap.php";
 global $page_meta;
 
@@ -13,8 +17,7 @@
 }
 
 // Iterate through all posts and find the one with the same slug
-// Not the most performant but once deployed they will all be static websites.
-$post = current(array_filter(updateAndGetCachedPostList(), function ($post) {
+$post = current(array_filter((new PostsCache())->updateAndGetCachedPostList(), function ($post) {
     return $post->slug == $_GET['slug'];
 }));
 
diff --git a/system/PostsCache.php b/system/PostsCache.php
new file mode 100644
index 0000000..bf360f1
--- /dev/null
+++ b/system/PostsCache.php
@@ -0,0 +1,99 @@
+<?php
+
+namespace Atas\SsgSystemPhp;
+
+/**
+ * This function reads the posts directory to generate posts.json file
+ * This way we are not compiling every .md file to read its meta data (front matter)
+ * If any post's last modified time is newer than the cached posts.json file, it will be updated
+ */
+class PostsCache {
+    private string $cachePath;
+    private string $postsDir;
+
+    /* @var Post[] */
+    private array $cachedPosts = [];
+
+    public function __construct(string $cachePath = __DIR__ . "/../posts.json", string $postsDir = __DIR__ . "/../posts/") {
+        $this->cachePath = $cachePath;
+        $this->postsDir = $postsDir;
+
+        if (file_exists($this->cachePath)) {
+            $this->cachedPosts = json_decode(file_get_contents($this->cachePath));
+        }
+    }
+
+    public function updateAndGetCachedPostList(): array {
+        $cacheModified = false;
+
+        $postFiles = scandir($this->postsDir);
+        foreach ($postFiles as $postFile) {
+            if (!str_ends_with($postFile, ".md")) continue;
+            if ($this->shouldUpdateCache($postFile)) {
+                $this->updateCache($postFile);
+                $cacheModified = true;
+            }
+        }
+
+        $this->sortPosts();
+
+        if ($cacheModified) {
+            $this->saveCache();
+        }
+
+        return $this->cachedPosts;
+    }
+
+    private function shouldUpdateCache(string $postFile): bool {
+        if (is_file($this->postsDir . $postFile)) {
+            $lastModified = filemtime($this->postsDir . $postFile);
+            echo "lastModified: $lastModified for file $postFile\n";
+            foreach ($this->cachedPosts as $cachedPost) {
+                if ($cachedPost->filename === $postFile && $cachedPost->lastModified >= $lastModified) {
+                    return false;
+                }
+            }
+            return true;
+        }
+        return false;
+    }
+
+    protected function get_markdown(string $path): ConvertedMarkdown
+    {
+        return get_markdown($path);
+    }
+
+    private function updateCache(string $postFile): void {
+        $tpl = $this->get_markdown($this->postsDir . $postFile);
+
+        $postObj = new Post();
+        $postObj->title = $tpl->meta->title;
+        $postObj->desc = $tpl->meta->desc;
+        $postObj->slug = $tpl->meta->slug;
+        $postObj->filename = $postFile;
+        $postObj->lastModified = filemtime($this->postsDir . $postFile);
+
+        $found = false;
+        foreach ($this->cachedPosts as &$cachedPost) {
+            if ($cachedPost->filename === $postFile) {
+                $cachedPost = $postObj;
+                $found = true;
+                break;
+            }
+        }
+
+        if (!$found) {
+            $this->cachedPosts[] = $postObj;
+        }
+    }
+
+    private function sortPosts(): void {
+        usort($this->cachedPosts, function($a, $b) {
+            return strcmp($b->filename, $a->filename);
+        });
+    }
+
+    private function saveCache(): void {
+        file_put_contents($this->cachePath, json_encode($this->cachedPosts, JSON_PRETTY_PRINT));
+    }
+}
diff --git a/system/Types.php b/system/Types.php
index 9ec61ae..1286f79 100644
--- a/system/Types.php
+++ b/system/Types.php
@@ -1,5 +1,7 @@
 <?php
 
+namespace Atas\SsgSystemPhp;
+
 class Post {
     public string $title;
     public string $desc;
diff --git a/system/bootstrap.php b/system/bootstrap.php
index e154896..20c7f89 100644
--- a/system/bootstrap.php
+++ b/system/bootstrap.php
@@ -1,11 +1,13 @@
 <?php
 
+namespace Atas\SsgSystemPhp;
+
 use JetBrains\PhpStorm\NoReturn;
 use League\CommonMark\Exception\CommonMarkException;
 
 require_once(__DIR__ . "/../vendor/autoload.php");
 require_once(__DIR__ . '/Types.php');
-require_once(__DIR__ . '/cachingUtils.php');
+require_once(__DIR__ . '/PostsCache.php');
 
 $config = json_decode(file_get_contents(__DIR__ . "/../config.json"));
 
@@ -65,9 +67,9 @@ function getCurrentHostname(): string
     // Check if HTTPS or HTTP is being used
     $protocol = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on') ? "https" : "http";
 
-    $host = isBuildRunning() ? $config->prod_hostname : $_SERVER['HTTP_HOST'];
+    $host = isBuildRunning() ? $config->prod_hostname : $_SERVER['HTTP_HOST'] ?? "localhost";
     // Get the server port
-    $port = $_SERVER['SERVER_PORT'];
+    $port = $_SERVER['SERVER_PORT'] ?? "80";
 
     // Depending on whether the port is standard for the protocol, include it in the URL
     if (($protocol === 'http' && $port == 80) || ($protocol === 'https' && $port == 443)) {
diff --git a/system/cachingUtils.php b/system/cachingUtils.php
deleted file mode 100644
index 46427b4..0000000
--- a/system/cachingUtils.php
+++ /dev/null
@@ -1,98 +0,0 @@
-<?php
-function findMostRecentlyUpdatedFile($dir) {
-    $latestFile = "";
-    $latestTime = 0;
-
-    foreach (scandir($dir) as $file) {
-        // Avoid directories and only check files
-        if (is_file($dir . '/' . $file)) {
-            $fileTime = filemtime($dir . '/' . $file);
-            if ($fileTime > $latestTime) {
-                $latestTime = $fileTime;
-                $latestFile = $file;
-            }
-        }
-    }
-
-    return $latestTime;
-}
-
-/*
- * TODO: This function needs refactoring, should be a class, and needs tests.
- * It can also be used for caching individual .md files.
- *
- * This function reads the posts directory to generate posts.json file
- * This way we are not compiling every .md file to read its meta data (front matter)
- * If any post's last modified time is newer than the cached posts.json file, it will be updated
- * @return Post[]
- */
-function updateAndGetCachedPostList(): array
-{
-    $cachePath = __DIR__ . '/../tmp/posts.json';
-    $postsDir = __DIR__ . '/../posts/';
-
-    /* @var Post[] $cachedPosts */
-    $cachedPosts = [];
-    if (file_exists($cachePath)) {
-        $cachedPostsJson = file_get_contents($cachePath);
-        $cachedPosts = json_decode($cachedPostsJson);
-    }
-
-    $cacheModified = false; // Flag to track modifications
-
-    // Iterate through each post in the directory
-    $postFiles = scandir($postsDir);
-    foreach ($postFiles as $postFile) {
-        if (is_file($postsDir . $postFile)) {
-            $lastModified = filemtime($postsDir . $postFile);
-
-            // Check if post is in cache and if its lastModified is outdated
-            $shouldUpdateCache = true;
-            foreach ($cachedPosts as &$cachedPost) {
-                if ($cachedPost->filename === $postFile && $cachedPost->lastModified >= $lastModified) {
-                    $shouldUpdateCache = false;
-                    break;
-                }
-            }
-
-            // If post is outdated or not in cache, update its data
-            if ($shouldUpdateCache) {
-                $tpl = get_markdown($postsDir . $postFile);
-
-                $postObj = new stdClass();
-                $postObj->title = $tpl->meta->title;
-                $postObj->desc = $tpl->meta->desc;
-                $postObj->slug = $tpl->meta->slug;
-                $postObj->filename = $postFile;
-                $postObj->lastModified = $lastModified;
-
-                // Replace or append the post in the cache array
-                $found = false;
-                foreach ($cachedPosts as &$cachedPost) {
-                    if ($cachedPost->filename === $postFile) {
-                        $cachedPost = $postObj;
-                        $found = true;
-                        break;
-                    }
-                }
-                if (!$found) {
-                    $cachedPosts[] = $postObj;
-                }
-
-                $cacheModified = true; // Mark that the cache has been modified
-            }
-        }
-    }
-
-    // Sort the cached posts by descending filename
-    usort($cachedPosts, function($a, $b) {
-        return strcmp($b->filename, $a->filename);
-    });
-
-    // Only save the updated cache if it was modified
-    if ($cacheModified) {
-        file_put_contents($cachePath, json_encode($cachedPosts, JSON_PRETTY_PRINT));
-    }
-
-    return $cachedPosts;
-}
diff --git a/system/layoutUtils.php b/system/layoutUtils.php
index 81b8349..9d602a1 100644
--- a/system/layoutUtils.php
+++ b/system/layoutUtils.php
@@ -1,5 +1,7 @@
 <?php
 
+namespace Atas\SsgSystemPhp;
+
 /**
  * Returns the 'selected' css class if the selectedTab variable matches the given tab name. Or returns empty string.
  * @param $tab string
diff --git a/system/markdown.php b/system/markdown.php
index b5d0fdc..a5f1dec 100644
--- a/system/markdown.php
+++ b/system/markdown.php
@@ -1,5 +1,7 @@
 <?php
 
+namespace Atas\SsgSystemPhp;
+
 require_once(__DIR__."/../vendor/league/commonmark/src/GithubFlavoredMarkdownConverter.php");
 
 use League\CommonMark\Exception\CommonMarkException;
@@ -71,6 +73,10 @@ function convert_markdown($path): ConvertedMarkdown
     if ($output instanceof RenderedContentWithFrontMatter) {
         $tpl->meta = (object) $output->getFrontMatter();
     }
+    if (!isset($tpl->meta)) $tpl->meta = new \stdClass();
+    if (!isset($tpl->meta->title)) $tpl->meta->title = "Untitled";
+    if (!isset($tpl->meta->slug)) $tpl->meta->slug = "slug";
+    if (!isset($tpl->meta->desc)) $tpl->meta->desc = "";
 
     return $tpl;
 }
diff --git a/tests/PostsCacheTest.php b/tests/PostsCacheTest.php
new file mode 100644
index 0000000..fae7d9d
--- /dev/null
+++ b/tests/PostsCacheTest.php
@@ -0,0 +1,134 @@
+<?php
+
+namespace Atas\SsgSystemPhp\Tests;
+
+require 'system/bootstrap.php';
+
+use Atas\SsgSystemPhp\PostsCache;
+use PHPUnit\Framework\TestCase;
+
+class PostsCacheTest extends TestCase
+{
+    protected string $postsDir;
+    protected string $postsCacheFilePath;
+
+    protected function setUp(): void
+    {
+        $this->postsDir = __DIR__ . "/../tmp/test_posts/";
+        $this->postsCacheFilePath = __DIR__ . "/../tmp/test_cache.json";
+
+        if (!is_dir($this->postsDir)) {
+            mkdir($this->postsDir);
+        }
+    }
+
+    protected function tearDown(): void
+    {
+        if (file_exists($this->postsCacheFilePath)) {
+            unlink($this->postsCacheFilePath);
+        }
+
+        shell_exec("rm -rf " . escapeshellarg($this->postsDir) . " $this->postsCacheFilePath");
+    }
+
+    public function testUpdateAndGetCachedPostList()
+    {
+        // Create a dummy post file
+        file_put_contents($this->postsDir . 'test.md',
+            "---\ntitle: Mocked Title\ndesc: Mocked Description\nslug: mocked-slug\n---\n# Mocked Title\nThis is a mocked post content.");
+
+        // Instantiate TestablePostsCache with the test environment
+        $postsCache = new PostsCache($this->postsCacheFilePath, $this->postsDir);
+
+        // Run the method
+        $posts = $postsCache->updateAndGetCachedPostList();
+
+        // Assert that the cached list is as expected
+        $this->assertCount(1, $posts);
+        $this->assertEquals("Mocked Title", $posts[0]->title);
+        $this->assertEquals("Mocked Description", $posts[0]->desc);
+        $this->assertEquals("mocked-slug", $posts[0]->slug);
+    }
+
+    public function testAddingNewPostUpdatesCache()
+    {
+        // Create an initial dummy post
+        file_put_contents($this->postsDir . 'a.md', "# Mocked Title\nThis is a mocked post content.");
+
+        // Instantiate TestablePostsCache with the test environment
+        $postsCache = new PostsCache($this->postsCacheFilePath, $this->postsDir);
+
+        // Run the method
+        $posts = $postsCache->updateAndGetCachedPostList();
+
+        // Assert that the cached list is as expected
+        $this->assertCount(1, $posts);
+
+        // Now, add another post
+        file_put_contents($this->postsDir . 'b.md', "# Another Mocked Title\nThis is another mocked post content.");
+
+        // Run the method again
+        $posts = $postsCache->updateAndGetCachedPostList();
+
+        // Assert that the cached list is updated
+        $this->assertCount(2, $posts);
+    }
+
+    public function testSortingOfPosts()
+    {
+        // Create multiple dummy posts
+        file_put_contents($this->postsDir . 'c.md', "# C Title\nThis is a mocked post content.");
+        file_put_contents($this->postsDir . 'a.md', "# A Title\nThis is a mocked post content.");
+        file_put_contents($this->postsDir . 'b.md', "# B Title\nThis is another mocked post content.");
+
+        // Instantiate TestablePostsCache with the test environment
+        $postsCache = new PostsCache($this->postsCacheFilePath, $this->postsDir);
+
+        // Run the method
+        $posts = $postsCache->updateAndGetCachedPostList();
+
+        // Assert that posts are sorted
+        $this->assertEquals('c.md', $posts[0]->filename);
+        $this->assertEquals('b.md', $posts[1]->filename);
+        $this->assertEquals('a.md', $posts[2]->filename);
+    }
+
+    public function testNonPostFilesAreIgnored()
+    {
+        // Create a dummy file that's not a post and a directory
+        file_put_contents($this->postsDir . 'not_a_post.txt', "This is not a post content.");
+        mkdir($this->postsDir . 'directory');
+
+        // Instantiate TestablePostsCache with the test environment
+        $postsCache = new PostsCache($this->postsCacheFilePath, $this->postsDir);
+
+        // Run the method
+        $posts = $postsCache->updateAndGetCachedPostList();
+
+        // Assert that the cached list is empty
+        $this->assertCount(0, $posts);
+    }
+
+    public function testModifyingPostUpdatesCache()
+    {
+        // Create an initial dummy post
+        $filePath = $this->postsDir . 'test.md';
+        file_put_contents($filePath, "---\ntitle: Mocked Title\n---\n# test");
+
+        // Instantiate TestablePostsCache with the test environment
+        $postsCache = new PostsCache($this->postsCacheFilePath, $this->postsDir);
+        $postsCache->updateAndGetCachedPostList();
+
+        // Modify the post
+        sleep(2);  // Ensuring the modified time changes
+        unlink($filePath);
+        file_put_contents($filePath, "---\ntitle: Modified Title\n---\n# test");
+
+        // Run the method again
+        $postsCache = new PostsCache($this->postsCacheFilePath, $this->postsDir);
+        $posts = $postsCache->updateAndGetCachedPostList();
+
+        // Assert that the post in the cached list is updated
+        $this->assertEquals("Modified Title", $posts[0]->title);
+    }
+}