feat: introduce PHPUnit

6 files changed, 2198 insertions, 3 deletions

diff --git a/.gitignore b/.gitignore
index 6ddbc84..ce30be4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /vendor/
+/.phpunit.cache
 /reli.log
diff --git a/composer.json b/composer.json
index a06b769..fe691f9 100644
--- a/composer.json
+++ b/composer.json
@@ -10,13 +10,15 @@
     ],
     "autoload": {
         "psr-4": {
-            "Nsfisis\\Waddiwasi\\": "src/"
+            "Nsfisis\\Waddiwasi\\": "src/",
+            "Nsfisis\\Waddiwasi\\Tests\\": "tests/src/"
         }
     },
     "require-dev": {
         "phpstan/phpstan": "^1.10.67",
         "phpstan/phpstan-deprecation-rules": "^1.1.4",
         "phpstan/phpstan-strict-rules": "^1.5.5",
+        "phpunit/phpunit": "^11.1",
         "reliforp/reli-prof": "0.12.x-dev",
         "symplify/easy-coding-standard": "^12.1.14"
     },
@@ -25,12 +27,20 @@
         "sort-packages": true
     },
     "scripts": {
+        "check": [
+            "@lint",
+            "@test"
+        ],
         "ecs": "ecs check",
         "ecsfix": "ecs check --fix",
         "lint": [
             "@ecs",
             "@phpstan"
         ],
-        "phpstan": "phpstan --memory-limit=1G analyse"
+        "phpstan": "phpstan --memory-limit=1G analyse",
+        "phpunit": "phpunit",
+        "test": [
+            "@phpunit"
+        ]
     }
 }
diff --git a/composer.lock b/composer.lock
index 2f1a80a..2d2b510 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": "f5cc93268af6d7631dae6e79094ed472",
+    "content-hash": "f40c16b6ebdc9c3fc6f64dae65d442e6",
     "packages": [],
     "packages-dev": [
         {
@@ -1366,6 +1366,241 @@
             "time": "2024-04-12T21:02:21+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": "v5.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nikic/PHP-Parser.git",
+                "reference": "139676794dc1e9231bf7bcd123cfc0c99182cb13"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/139676794dc1e9231bf7bcd123cfc0c99182cb13",
+                "reference": "139676794dc1e9231bf7bcd123cfc0c99182cb13",
+                "shasum": ""
+            },
+            "require": {
+                "ext-ctype": "*",
+                "ext-json": "*",
+                "ext-tokenizer": "*",
+                "php": ">=7.4"
+            },
+            "require-dev": {
+                "ircmaxell/php-yacc": "^0.0.7",
+                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
+            },
+            "bin": [
+                "bin/php-parse"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "5.0-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/v5.0.2"
+            },
+            "time": "2024-03-05T20:51:40+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "2.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "54750ef60c58e43759730615a392c31c80e23176"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/54750ef60c58e43759730615a392c31c80e23176",
+                "reference": "54750ef60c58e43759730615a392c31c80e23176",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-libxml": "*",
+                "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/2.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-03T12:33:53+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": "php-di/invoker",
             "version": "2.3.4",
             "source": {
@@ -1649,6 +1884,429 @@
             "time": "2024-04-19T15:12:26+00:00"
         },
         {
+            "name": "phpunit/php-code-coverage",
+            "version": "11.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
+                "reference": "7e35a2cbcabac0e6865fd373742ea432a3c34f92"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/7e35a2cbcabac0e6865fd373742ea432a3c34f92",
+                "reference": "7e35a2cbcabac0e6865fd373742ea432a3c34f92",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-libxml": "*",
+                "ext-xmlwriter": "*",
+                "nikic/php-parser": "^5.0",
+                "php": ">=8.2",
+                "phpunit/php-file-iterator": "^5.0",
+                "phpunit/php-text-template": "^4.0",
+                "sebastian/code-unit-reverse-lookup": "^4.0",
+                "sebastian/complexity": "^4.0",
+                "sebastian/environment": "^7.0",
+                "sebastian/lines-of-code": "^3.0",
+                "sebastian/version": "^5.0",
+                "theseer/tokenizer": "^1.2.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "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-main": "11.0-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 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/11.0.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-12T15:35:40+00:00"
+        },
+        {
+            "name": "phpunit/php-file-iterator",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
+                "reference": "99e95c94ad9500daca992354fa09d7b99abe2210"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/99e95c94ad9500daca992354fa09d7b99abe2210",
+                "reference": "99e95c94ad9500daca992354fa09d7b99abe2210",
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+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "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": "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",
+                "security": "https://github.com/sebastianbergmann/php-file-iterator/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:05:04+00:00"
+        },
+        {
+            "name": "phpunit/php-invoker",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-invoker.git",
+                "reference": "5d8d9355a16d8cc5a1305b0a85342cfa420612be"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-invoker/zipball/5d8d9355a16d8cc5a1305b0a85342cfa420612be",
+                "reference": "5d8d9355a16d8cc5a1305b0a85342cfa420612be",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "ext-pcntl": "*",
+                "phpunit/phpunit": "^11.0"
+            },
+            "suggest": {
+                "ext-pcntl": "*"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "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": "Invoke callables with a timeout",
+            "homepage": "https://github.com/sebastianbergmann/php-invoker/",
+            "keywords": [
+                "process"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-invoker/issues",
+                "security": "https://github.com/sebastianbergmann/php-invoker/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-invoker/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:05:50+00:00"
+        },
+        {
+            "name": "phpunit/php-text-template",
+            "version": "4.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-text-template.git",
+                "reference": "d38f6cbff1cdb6f40b03c9811421561668cc133e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-text-template/zipball/d38f6cbff1cdb6f40b03c9811421561668cc133e",
+                "reference": "d38f6cbff1cdb6f40b03c9811421561668cc133e",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "4.0-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": "Simple template engine.",
+            "homepage": "https://github.com/sebastianbergmann/php-text-template/",
+            "keywords": [
+                "template"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-text-template/issues",
+                "security": "https://github.com/sebastianbergmann/php-text-template/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-text-template/tree/4.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:06:56+00:00"
+        },
+        {
+            "name": "phpunit/php-timer",
+            "version": "7.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-timer.git",
+                "reference": "8a59d9e25720482ee7fcdf296595e08795b84dc5"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/8a59d9e25720482ee7fcdf296595e08795b84dc5",
+                "reference": "8a59d9e25720482ee7fcdf296595e08795b84dc5",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "7.0-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/",
+            "keywords": [
+                "timer"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-timer/issues",
+                "security": "https://github.com/sebastianbergmann/php-timer/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-timer/tree/7.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:08:01+00:00"
+        },
+        {
+            "name": "phpunit/phpunit",
+            "version": "11.1.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/phpunit.git",
+                "reference": "d475be032238173ca3b0a516f5cc291d174708ae"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/d475be032238173ca3b0a516f5cc291d174708ae",
+                "reference": "d475be032238173ca3b0a516f5cc291d174708ae",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-json": "*",
+                "ext-libxml": "*",
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+        },
+        {
+            "name": "sebastian/lines-of-code",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/lines-of-code.git",
+                "reference": "376c5b3f6b43c78fdc049740bca76a7c846706c0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/lines-of-code/zipball/376c5b3f6b43c78fdc049740bca76a7c846706c0",
+                "reference": "376c5b3f6b43c78fdc049740bca76a7c846706c0",
+                "shasum": ""
+            },
+            "require": {
+                "nikic/php-parser": "^5.0",
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "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 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",
+                "security": "https://github.com/sebastianbergmann/lines-of-code/security/policy",
+                "source": "https://github.com/sebastianbergmann/lines-of-code/tree/3.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:00:36+00:00"
+        },
+        {
+            "name": "sebastian/object-enumerator",
+            "version": "6.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
+                "reference": "f75f6c460da0bbd9668f43a3dde0ec0ba7faa678"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/f75f6c460da0bbd9668f43a3dde0ec0ba7faa678",
+                "reference": "f75f6c460da0bbd9668f43a3dde0ec0ba7faa678",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2",
+                "sebastian/object-reflector": "^4.0",
+                "sebastian/recursion-context": "^6.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-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",
+                "security": "https://github.com/sebastianbergmann/object-enumerator/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/6.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:01:29+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "4.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "bb2a6255d30853425fd38f032eb64ced9f7f132d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/bb2a6255d30853425fd38f032eb64ced9f7f132d",
+                "reference": "bb2a6255d30853425fd38f032eb64ced9f7f132d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "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": "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",
+                "security": "https://github.com/sebastianbergmann/object-reflector/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/4.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:02:18+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "6.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "b75224967b5a466925c6d54e68edd0edf8dd4ed4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/b75224967b5a466925c6d54e68edd0edf8dd4ed4",
+                "reference": "b75224967b5a466925c6d54e68edd0edf8dd4ed4",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-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",
+                "security": "https://github.com/sebastianbergmann/recursion-context/security/policy",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/6.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:08:48+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "b8502785eb3523ca0dd4afe9ca62235590020f3f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/b8502785eb3523ca0dd4afe9ca62235590020f3f",
+                "reference": "b8502785eb3523ca0dd4afe9ca62235590020f3f",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "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": "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",
+                "security": "https://github.com/sebastianbergmann/type/security/policy",
+                "source": "https://github.com/sebastianbergmann/type/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:09:34+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "13999475d2cb1ab33cb73403ba356a814fdbb001"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/13999475d2cb1ab33cb73403ba356a814fdbb001",
+                "reference": "13999475d2cb1ab33cb73403ba356a814fdbb001",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "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": "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",
+                "security": "https://github.com/sebastianbergmann/version/security/policy",
+                "source": "https://github.com/sebastianbergmann/version/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:10:47+00:00"
+        },
+        {
             "name": "sj-i/php-cast",
             "version": "v1.0.0",
             "source": {
@@ -2753,6 +4334,56 @@
             "time": "2024-02-23T13:10:40+00:00"
         },
         {
+            "name": "theseer/tokenizer",
+            "version": "1.2.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
+                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
+                "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/1.2.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-03T12:36:25+00:00"
+        },
+        {
             "name": "webmozart/assert",
             "version": "1.11.0",
             "source": {
diff --git a/ecs.php b/ecs.php
index d883d3f..af807fe 100644
--- a/ecs.php
+++ b/ecs.php
@@ -10,6 +10,7 @@ use PhpCsFixer\Fixer\FunctionNotation\NativeFunctionInvocationFixer;
 return function (ECSConfig $ecsConfig): void {
     $ecsConfig->paths([
         __DIR__ . '/src',
+        __DIR__ . '/tests',
         __DIR__ . '/examples',
     ]);
     $ecsConfig->sets([
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..db40928
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/11.1/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         cacheDirectory=".phpunit.cache"
+         executionOrder="depends,defects"
+         beStrictAboutOutputDuringTests="true"
+         failOnRisky="true"
+         failOnWarning="true">
+    <testsuites>
+        <testsuite name="default">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <source ignoreIndirectDeprecations="true" restrictNotices="true" restrictWarnings="true">
+        <include>
+            <directory>src</directory>
+        </include>
+    </source>
+</phpunit>
diff --git a/tests/src/SpecTestsuites/CoreTest.php b/tests/src/SpecTestsuites/CoreTest.php
new file mode 100644
index 0000000..75d4c2f
--- /dev/null
+++ b/tests/src/SpecTestsuites/CoreTest.php
@@ -0,0 +1,531 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsfisis\Waddiwasi\Tests\SpecTestsuites;
+
+use Nsfisis\Waddiwasi\BinaryFormat\Decoder;
+use Nsfisis\Waddiwasi\Execution\Runtime;
+use Nsfisis\Waddiwasi\Execution\Store;
+use PHPUnit\Framework\TestCase;
+use function count;
+
+final class CoreTest extends TestCase
+{
+    public function testAddress(): void
+    {
+        $this->runSpecTestsuite('address');
+    }
+
+    public function testAlign(): void
+    {
+        $this->runSpecTestsuite('align');
+    }
+
+    public function testBinaryLeb128(): void
+    {
+        $this->runSpecTestsuite('binary-leb128');
+    }
+
+    public function testBinary(): void
+    {
+        $this->runSpecTestsuite('binary');
+    }
+
+    public function testBlock(): void
+    {
+        $this->runSpecTestsuite('block');
+    }
+
+    public function testBr(): void
+    {
+        $this->runSpecTestsuite('br');
+    }
+
+    public function testBrIf(): void
+    {
+        $this->runSpecTestsuite('br_if');
+    }
+
+    public function testBrTable(): void
+    {
+        $this->runSpecTestsuite('br_table');
+    }
+
+    public function testBulk(): void
+    {
+        $this->runSpecTestsuite('bulk');
+    }
+
+    public function testCall(): void
+    {
+        $this->runSpecTestsuite('call');
+    }
+
+    public function testCallIndirect(): void
+    {
+        $this->runSpecTestsuite('call_indirect');
+    }
+
+    public function testConst(): void
+    {
+        $this->runSpecTestsuite('const');
+    }
+
+    public function testConversions(): void
+    {
+        $this->runSpecTestsuite('conversions');
+    }
+
+    public function testCustom(): void
+    {
+        $this->runSpecTestsuite('custom');
+    }
+
+    public function testData(): void
+    {
+        $this->runSpecTestsuite('data');
+    }
+
+    public function testElem(): void
+    {
+        $this->runSpecTestsuite('elem');
+    }
+
+    public function testEndianness(): void
+    {
+        $this->runSpecTestsuite('endianness');
+    }
+
+    public function testExports(): void
+    {
+        $this->runSpecTestsuite('exports');
+    }
+
+    public function testF32(): void
+    {
+        $this->runSpecTestsuite('f32');
+    }
+
+    public function testF32Bitwise(): void
+    {
+        $this->runSpecTestsuite('f32_bitwise');
+    }
+
+    public function testF32Cmp(): void
+    {
+        $this->runSpecTestsuite('f32_cmp');
+    }
+
+    public function testF64(): void
+    {
+        $this->runSpecTestsuite('f64');
+    }
+
+    public function testF64Bitwise(): void
+    {
+        $this->runSpecTestsuite('f64_bitwise');
+    }
+
+    public function testF64Cmp(): void
+    {
+        $this->runSpecTestsuite('f64_cmp');
+    }
+
+    public function testFac(): void
+    {
+        $this->runSpecTestsuite('fac');
+    }
+
+    public function testFloatExprs(): void
+    {
+        $this->runSpecTestsuite('float_exprs');
+    }
+
+    public function testFloatLiterals(): void
+    {
+        $this->runSpecTestsuite('float_literals');
+    }
+
+    public function testFloatMemory(): void
+    {
+        $this->runSpecTestsuite('float_memory');
+    }
+
+    public function testFloatMisc(): void
+    {
+        $this->runSpecTestsuite('float_misc');
+    }
+
+    public function testForward(): void
+    {
+        $this->runSpecTestsuite('forward');
+    }
+
+    public function testFunc(): void
+    {
+        $this->runSpecTestsuite('func');
+    }
+
+    public function testFuncPtrs(): void
+    {
+        $this->runSpecTestsuite('func_ptrs');
+    }
+
+    public function testGlobal(): void
+    {
+        $this->runSpecTestsuite('global');
+    }
+
+    public function testI32(): void
+    {
+        $this->runSpecTestsuite('i32');
+    }
+
+    public function testI64(): void
+    {
+        $this->runSpecTestsuite('i64');
+    }
+
+    public function testIf(): void
+    {
+        $this->runSpecTestsuite('if');
+    }
+
+    public function testImports(): void
+    {
+        $this->runSpecTestsuite('imports');
+    }
+
+    public function testInlineModule(): void
+    {
+        $this->runSpecTestsuite('inline-module');
+    }
+
+    public function testIntExprs(): void
+    {
+        $this->runSpecTestsuite('int_exprs');
+    }
+
+    public function testIntLiterals(): void
+    {
+        $this->runSpecTestsuite('int_literals');
+    }
+
+    public function testLabels(): void
+    {
+        $this->runSpecTestsuite('labels');
+    }
+
+    public function testLeftToRight(): void
+    {
+        $this->runSpecTestsuite('left-to-right');
+    }
+
+    public function testLinking(): void
+    {
+        $this->runSpecTestsuite('linking');
+    }
+
+    public function testLoad(): void
+    {
+        $this->runSpecTestsuite('load');
+    }
+
+    public function testLocalGet(): void
+    {
+        $this->runSpecTestsuite('local_get');
+    }
+
+    public function testLocalSet(): void
+    {
+        $this->runSpecTestsuite('local_set');
+    }
+
+    public function testLocalTee(): void
+    {
+        $this->runSpecTestsuite('local_tee');
+    }
+
+    public function testLoop(): void
+    {
+        $this->runSpecTestsuite('loop');
+    }
+
+    public function testMemory(): void
+    {
+        $this->runSpecTestsuite('memory');
+    }
+
+    public function testMemoryCopy(): void
+    {
+        $this->runSpecTestsuite('memory_copy');
+    }
+
+    public function testMemoryFill(): void
+    {
+        $this->runSpecTestsuite('memory_fill');
+    }
+
+    public function testMemoryGrow(): void
+    {
+        $this->runSpecTestsuite('memory_grow');
+    }
+
+    public function testMemoryInit(): void
+    {
+        $this->runSpecTestsuite('memory_init');
+    }
+
+    public function testMemoryRedundancy(): void
+    {
+        $this->runSpecTestsuite('memory_redundancy');
+    }
+
+    public function testMemorySize(): void
+    {
+        $this->runSpecTestsuite('memory_size');
+    }
+
+    public function testMemoryTrap(): void
+    {
+        $this->runSpecTestsuite('memory_trap');
+    }
+
+    public function testNames(): void
+    {
+        $this->runSpecTestsuite('names');
+    }
+
+    public function testNop(): void
+    {
+        $this->runSpecTestsuite('nop');
+    }
+
+    public function testObsoleteKeywords(): void
+    {
+        $this->runSpecTestsuite('obsolete-keywords');
+    }
+
+    public function testRefFunc(): void
+    {
+        $this->runSpecTestsuite('ref_func');
+    }
+
+    public function testRefIsNull(): void
+    {
+        $this->runSpecTestsuite('ref_is_null');
+    }
+
+    public function testRefNull(): void
+    {
+        $this->runSpecTestsuite('ref_null');
+    }
+
+    public function testReturn(): void
+    {
+        $this->runSpecTestsuite('return');
+    }
+
+    public function testSelect(): void
+    {
+        $this->runSpecTestsuite('select');
+    }
+
+    public function testSkipStackGuardPage(): void
+    {
+        $this->runSpecTestsuite('skip-stack-guard-page');
+    }
+
+    public function testStack(): void
+    {
+        $this->runSpecTestsuite('stack');
+    }
+
+    public function testStart(): void
+    {
+        $this->runSpecTestsuite('start');
+    }
+
+    public function testStore(): void
+    {
+        $this->runSpecTestsuite('store');
+    }
+
+    public function testSwitch(): void
+    {
+        $this->runSpecTestsuite('switch');
+    }
+
+    public function testTableSub(): void
+    {
+        $this->runSpecTestsuite('table-sub');
+    }
+
+    public function testTable(): void
+    {
+        $this->runSpecTestsuite('table');
+    }
+
+    public function testTableCopy(): void
+    {
+        $this->runSpecTestsuite('table_copy');
+    }
+
+    public function testTableFill(): void
+    {
+        $this->runSpecTestsuite('table_fill');
+    }
+
+    public function testTableGet(): void
+    {
+        $this->runSpecTestsuite('table_get');
+    }
+
+    public function testTableGrow(): void
+    {
+        $this->runSpecTestsuite('table_grow');
+    }
+
+    public function testTableInit(): void
+    {
+        $this->runSpecTestsuite('table_init');
+    }
+
+    public function testTableSet(): void
+    {
+        $this->runSpecTestsuite('table_set');
+    }
+
+    public function testTableSize(): void
+    {
+        $this->runSpecTestsuite('table_size');
+    }
+
+    public function testToken(): void
+    {
+        $this->runSpecTestsuite('token');
+    }
+
+    public function testTraps(): void
+    {
+        $this->runSpecTestsuite('traps');
+    }
+
+    public function testType(): void
+    {
+        $this->runSpecTestsuite('type');
+    }
+
+    public function testUnreachable(): void
+    {
+        $this->runSpecTestsuite('unreachable');
+    }
+
+    public function testUnreachedInvalid(): void
+    {
+        $this->runSpecTestsuite('unreached-invalid');
+    }
+
+    public function testUnreachedValid(): void
+    {
+        $this->runSpecTestsuite('unreached-valid');
+    }
+
+    public function testUnwind(): void
+    {
+        $this->runSpecTestsuite('unwind');
+    }
+
+    public function testUtf8CustomSectionId(): void
+    {
+        $this->runSpecTestsuite('utf8-custom-section-id');
+    }
+
+    public function testUtf8ImportField(): void
+    {
+        $this->runSpecTestsuite('utf8-import-field');
+    }
+
+    public function testUtf8ImportModule(): void
+    {
+        $this->runSpecTestsuite('utf8-import-module');
+    }
+
+    public function testUtf8InvalidEncoding(): void
+    {
+        $this->runSpecTestsuite('utf8-invalid-encoding');
+    }
+
+    private function runSpecTestsuite(string $testsuiteName): void
+    {
+        $baseDir = __DIR__ . '/../../fixtures/spec_testsuites/core';
+        $testsuiteDefinitionFileContent = file_get_contents("$baseDir/$testsuiteName.json");
+        $testsuiteDefinition = json_decode($testsuiteDefinitionFileContent, true);
+
+        $commands = $testsuiteDefinition['commands'];
+        $modules = [];
+        $runtimes = [];
+        foreach ($commands as $command) {
+            switch ($command['type']) {
+                case 'module':
+                    $filename = $command['filename'];
+                    $moduleName = $command['name'] ?? '_';
+                    $filePath = "$baseDir/$filename";
+                    $wasmBinary = file_get_contents($filePath);
+                    $module = (new Decoder($wasmBinary))->decode();
+                    $modules[$moduleName] = $module;
+                    $runtime = Runtime::instantiate(Store::empty(), $module, []);
+                    $runtimes[$moduleName] = $runtime;
+                    break;
+                case 'action':
+                    break;
+                case 'assert_exhaustion':
+                    break;
+                case 'assert_invalid':
+                    break;
+                case 'assert_malformed':
+                    break;
+                case 'assert_return':
+                    $targetModuleName = $command['module'] ?? '_';
+                    $targetModule = $modules[$targetModuleName];
+                    $expectedResults = $command['expected'];
+                    $action = $command['action'];
+                    $actionType = $action['type'];
+                    $actionField = $action['field'];
+                    if ($actionType === 'invoke') {
+                        $actionArgs = $action['args'];
+                        $runtime = $runtimes[$targetModuleName];
+                        if (count($actionArgs) === 0) {
+                            $actualResults = $runtime->invoke($actionField, []);
+                            $this->assertCount(count($expectedResults), $actualResults, "at $command[line]");
+                            for ($i = 0; $i < count($expectedResults); $i++) {
+                                $expectedResult = $expectedResults[$i];
+                                $actualResult = $actualResults[$i];
+                                if ($expectedResult['type'] === 'f32') {
+                                    $expectedValue = unpack('g', pack('l', (int)$expectedResult['value']))[1];
+                                    $this->assertSame($expectedValue, $actualResult, "at $command[line]");
+                                } elseif ($expectedResult['type'] === 'f64') {
+                                    $expectedValue = unpack('e', pack('q', (int)$expectedResult['value']))[1];
+                                    $this->assertSame($expectedValue, $actualResult, "at $command[line]");
+                                } else {
+                                    $expectedValue = (int)$expectedResult['value'];
+                                    $this->assertSame($expectedValue, $actualResult, "at $command[line]");
+                                }
+                            }
+                        }
+                    } else {
+                    }
+                    break;
+                case 'assert_trap':
+                    break;
+                case 'assert_uninstantiable':
+                    break;
+                case 'assert_unlinkable':
+                    break;
+                case 'register':
+                    break;
+            }
+        }
+    }
+}