diff --git a/.github/workflows/checks.yaml b/.github/workflows/checks.yaml
new file mode 100644
index 0000000..24191a6
--- /dev/null
+++ b/.github/workflows/checks.yaml
@@ -0,0 +1,50 @@
+name: Checks
+on:
+  pull_request:
+  push:
+    branches:
+      - "main"
+jobs:
+  checks:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      -
+        name: Checkout repo
+        uses: actions/checkout@v4
+      -
+        name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.2
+      -
+        name: Install dependencies
+        run: composer install --no-progress --prefer-dist --no-interaction
+
+      -
+        name: Check formatting
+        run: vendor/bin/ecs
+
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php-version: ['8.2', '8.3']
+        dependency-version: [ prefer-lowest, prefer-stable ]
+    steps:
+      -
+        name: Checkout repo
+        uses: actions/checkout@v4
+      -
+        name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+      -
+        name: Install dependencies
+        run: composer update --no-progress --${{ matrix.dependency-version }} --prefer-dist --no-interaction
+      -
+        name: Run PHPUnit tests
+        run: composer test
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f13a2d4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/vendor/
+/.idea/
+/.phpunit.cache/
\ No newline at end of file
diff --git a/README.md b/README.md
index a6cb387..317a83c 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,6 @@
 # phpstan-rules
 Set of additional PHPStan rules
+
+- check if property and constant shouldn't be set as protected (when is not inherited or class is not abstract)
+- check if property name starts with underscore
+- check if constant name is uppercase
\ No newline at end of file
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..b6f41d8
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,46 @@
+{
+  "name": "pmarki/phpstan-rules",
+  "type": "phpstan-extension",
+  "description": "Set of additional PHPStan rules",
+  "license": "MIT",
+  "authors": [
+    {
+      "name": "Piotr Markiewicz",
+      "email": "email@markiewicz.xyz"
+    }
+  ],
+  "keywords": [
+    "static analysis"
+  ],
+  "extra": {
+    "phpstan": {
+      "includes": [
+        "extension.neon"
+      ]
+    }
+  },
+  "require": {
+    "php": "^8.2",
+    "phpstan/phpstan": "^2.0"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^10.1 || ^11.0 || ^12.0",
+    "symplify/easy-coding-standard": "^12.5"
+  },
+  "autoload": {
+    "psr-4": {"PMarki\\PHPStanRules\\": "src"}
+  },
+  "autoload-dev": {
+    "psr-4": {"PMarki\\PHPStanRules\\Tests\\": "tests"},
+    "classmap": ["tests/fixtures"]
+  },
+  "scripts": {
+    "ecs": "vendor/bin/ecs --fix",
+    "test": "vendor/bin/phpunit --colors=always"
+  },
+  "config": {
+    "allow-plugins": {
+      "dealerdirect/phpcodesniffer-composer-installer": true
+    }
+  }
+}
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..bb14f7f
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,1829 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "99918330d3aae74e244f87d6b3f5c81f",
+    "packages": [
+        {
+            "name": "phpstan/phpstan",
+            "version": "2.1.8",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan.git",
+                "reference": "f9adff3b87c03b12cc7e46a30a524648e497758f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/f9adff3b87c03b12cc7e46a30a524648e497758f",
+                "reference": "f9adff3b87c03b12cc7e46a30a524648e497758f",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.4|^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan-shim": "*"
+            },
+            "bin": [
+                "phpstan",
+                "phpstan.phar"
+            ],
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "PHPStan - PHP Static Analysis Tool",
+            "keywords": [
+                "dev",
+                "static analysis"
+            ],
+            "support": {
+                "docs": "https://phpstan.org/user-guide/getting-started",
+                "forum": "https://github.com/phpstan/phpstan/discussions",
+                "issues": "https://github.com/phpstan/phpstan/issues",
+                "security": "https://github.com/phpstan/phpstan/security/policy",
+                "source": "https://github.com/phpstan/phpstan-src"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/ondrejmirtes",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/phpstan",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-03-09T09:30:48+00:00"
+        }
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+    "packages-dev": [
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.13.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "024473a478be9df5fdaca2c793f2232fe788e414"
+            },
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+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/024473a478be9df5fdaca2c793f2232fe788e414",
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+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
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+            "conflict": {
+                "doctrine/collections": "<1.6.8",
+                "doctrine/common": "<2.13.3 || >=3 <3.2.2"
+            },
+            "require-dev": {
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+                "phpspec/prophecy": "^1.10",
+                "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
+            },
+            "type": "library",
+            "autoload": {
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+                    "src/DeepCopy/deep_copy.php"
+                ],
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+                }
+            },
+            "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/1.13.0"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2025-02-12T12:17:51+00:00"
+        },
+        {
+            "name": "nikic/php-parser",
+            "version": "v5.4.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nikic/PHP-Parser.git",
+                "reference": "447a020a1f875a434d62f2a401f53b82a396e494"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/447a020a1f875a434d62f2a401f53b82a396e494",
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+                "shasum": ""
+            },
+            "require": {
+                "ext-ctype": "*",
+                "ext-json": "*",
+                "ext-tokenizer": "*",
+                "php": ">=7.4"
+            },
+            "require-dev": {
+                "ircmaxell/php-yacc": "^0.0.7",
+                "phpunit/phpunit": "^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/v5.4.0"
+            },
+            "time": "2024-12-30T11:07:19+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",
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+                "shasum": ""
+            },
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+                "php": "^7.2 || ^8.0"
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
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+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
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+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
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+            ],
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+            "support": {
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+            },
+            "time": "2022-02-21T01:04:05+00:00"
+        },
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+            "version": "11.0.9",
+            "source": {
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+                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
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+                "sebastian/lines-of-code": "^3.0.1",
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+                "theseer/tokenizer": "^1.2.3"
+            },
+            "require-dev": {
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+            "suggest": {
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+                "ext-xdebug": "PHP extension that provides line coverage as well as branch and path coverage"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
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+            "license": [
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+            ],
+            "authors": [
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+                    "email": "sebastian@phpunit.de",
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+                }
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+            "homepage": "https://github.com/sebastianbergmann/php-code-coverage",
+            "keywords": [
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+                "security": "https://github.com/sebastianbergmann/php-code-coverage/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/11.0.9"
+            },
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+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-02-25T13:26:39+00:00"
+        },
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+            "version": "5.1.0",
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+                "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
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+            "extra": {
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+            "notification-url": "https://packagist.org/downloads/",
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+                    "role": "lead"
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+            ],
+            "description": "FilterIterator implementation that filters files based on a list of suffixes.",
+            "homepage": "https://github.com/sebastianbergmann/php-file-iterator/",
+            "keywords": [
+                "filesystem",
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+            ],
+            "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/5.1.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-08-27T05:02:59+00:00"
+        },
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+            "name": "phpunit/php-invoker",
+            "version": "5.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-invoker.git",
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+                "shasum": ""
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+            "require": {
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+            ],
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+                "issues": "https://github.com/sebastianbergmann/php-invoker/issues",
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+        },
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+                ]
+            },
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+            ],
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+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Volker Dusch",
+                    "email": "github@wallbash.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                },
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Provides the functionality to export PHP variables for visualization",
+            "homepage": "https://www.github.com/sebastianbergmann/exporter",
+            "keywords": [
+                "export",
+                "exporter"
+            ],
+            "support": {
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+                "security": "https://github.com/sebastianbergmann/exporter/security/policy",
+                "source": "https://github.com/sebastianbergmann/exporter/tree/6.3.0"
+            },
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+                    "url": "https://github.com/sebastianbergmann",
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+                }
+            ],
+            "time": "2024-12-05T09:17:50+00:00"
+        },
+        {
+            "name": "sebastian/global-state",
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+            },
+            "type": "library",
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+                    "dev-main": "7.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
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+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Snapshotting of global state",
+            "homepage": "https://www.github.com/sebastianbergmann/global-state",
+            "keywords": [
+                "global state"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/global-state/issues",
+                "security": "https://github.com/sebastianbergmann/global-state/security/policy",
+                "source": "https://github.com/sebastianbergmann/global-state/tree/7.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T04:57:36+00:00"
+        },
+        {
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+            "version": "3.0.1",
+            "source": {
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+                "shasum": ""
+            },
+            "require": {
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+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "3.0-dev"
+                }
+            },
+            "autoload": {
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+                ]
+            },
+            "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/3.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T04:58:38+00:00"
+        },
+        {
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+            },
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+            },
+            "require-dev": {
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+            },
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+                }
+            },
+            "autoload": {
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+                ]
+            },
+            "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/6.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T05:00:13+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "4.0.1",
+            "source": {
+                "type": "git",
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+            },
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+            },
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+            },
+            "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/4.0.1"
+            },
+            "funding": [
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+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T05:01:32+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "6.0.2",
+            "source": {
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+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
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+            },
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+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
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+            },
+            "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/6.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T05:10:34+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "5.1.2",
+            "source": {
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+                "url": "https://github.com/sebastianbergmann/type.git",
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+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.1-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": "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/5.1.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-03-18T13:35:50+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "5.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "c687e3387b99f5b03b6caa64c74b63e2936ff874"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/c687e3387b99f5b03b6caa64c74b63e2936ff874",
+                "reference": "c687e3387b99f5b03b6caa64c74b63e2936ff874",
+                "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/5.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-10-09T05:16:32+00:00"
+        },
+        {
+            "name": "staabm/side-effects-detector",
+            "version": "1.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/staabm/side-effects-detector.git",
+                "reference": "d8334211a140ce329c13726d4a715adbddd0a163"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/staabm/side-effects-detector/zipball/d8334211a140ce329c13726d4a715adbddd0a163",
+                "reference": "d8334211a140ce329c13726d4a715adbddd0a163",
+                "shasum": ""
+            },
+            "require": {
+                "ext-tokenizer": "*",
+                "php": "^7.4 || ^8.0"
+            },
+            "require-dev": {
+                "phpstan/extension-installer": "^1.4.3",
+                "phpstan/phpstan": "^1.12.6",
+                "phpunit/phpunit": "^9.6.21",
+                "symfony/var-dumper": "^5.4.43",
+                "tomasvotruba/type-coverage": "1.0.0",
+                "tomasvotruba/unused-public": "1.0.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "lib/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "A static analysis tool to detect side effects in PHP code",
+            "keywords": [
+                "static analysis"
+            ],
+            "support": {
+                "issues": "https://github.com/staabm/side-effects-detector/issues",
+                "source": "https://github.com/staabm/side-effects-detector/tree/1.0.5"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/staabm",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-10-20T05:08:20+00:00"
+        },
+        {
+            "name": "symplify/easy-coding-standard",
+            "version": "12.5.9",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/easy-coding-standard/easy-coding-standard.git",
+                "reference": "4b20b6fa6a1509811b91c3d931f799febb48b75a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/easy-coding-standard/easy-coding-standard/zipball/4b20b6fa6a1509811b91c3d931f799febb48b75a",
+                "reference": "4b20b6fa6a1509811b91c3d931f799febb48b75a",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2"
+            },
+            "conflict": {
+                "friendsofphp/php-cs-fixer": "<3.46",
+                "phpcsstandards/php_codesniffer": "<3.8",
+                "symplify/coding-standard": "<12.1"
+            },
+            "suggest": {
+                "ext-dom": "Needed to support checkstyle output format in class CheckstyleOutputFormatter"
+            },
+            "bin": [
+                "bin/ecs"
+            ],
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Use Coding Standard with 0-knowledge of PHP-CS-Fixer and PHP_CodeSniffer",
+            "keywords": [
+                "Code style",
+                "automation",
+                "fixer",
+                "static analysis"
+            ],
+            "support": {
+                "issues": "https://github.com/easy-coding-standard/easy-coding-standard/issues",
+                "source": "https://github.com/easy-coding-standard/easy-coding-standard/tree/12.5.9"
+            },
+            "funding": [
+                {
+                    "url": "https://www.paypal.me/rectorphp",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/tomasvotruba",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-03-17T15:30:37+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"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": "^8.2"
+    },
+    "platform-dev": [],
+    "plugin-api-version": "2.6.0"
+}
diff --git a/ecs.php b/ecs.php
new file mode 100644
index 0000000..964eddb
--- /dev/null
+++ b/ecs.php
@@ -0,0 +1,13 @@
+<?php declare(strict_types=1);
+
+use Symplify\EasyCodingStandard\Config\ECSConfig;
+
+return ECSConfig::configure()
+    ->withPaths([
+        __DIR__ . '/src',
+        __DIR__ . '/tests',
+    ])
+    ->withSkip([
+        __DIR__ . '/tests/fixtures',
+    ])
+    ->withPhpCsFixerSets(perCS20: true);
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..fcc818f
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0"?>
+<phpunit
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+        colors="true"
+        cacheDirectory=".phpunit.cache"
+>
+
+    <testsuite name="phpstan-rules">
+        <directory>./tests</directory>
+    </testsuite>
+    <source>
+        <include>
+            <directory suffix=".php">./src</directory>
+        </include>
+    </source>
+</phpunit>
\ No newline at end of file
diff --git a/src/Rules/ConstRule.php b/src/Rules/ConstRule.php
new file mode 100644
index 0000000..1891484
--- /dev/null
+++ b/src/Rules/ConstRule.php
@@ -0,0 +1,93 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PMarki\PHPStanRules\Rules;
+
+use PhpParser\Modifiers;
+use PhpParser\Node;
+use PhpParser\Node\Stmt\ClassConst;
+use PHPStan\Analyser\Scope;
+use PHPStan\Rules\Rule;
+use PHPStan\Rules\RuleErrorBuilder;
+
+/**
+ * @implements Rule<ClassConst>
+ */
+class ConstRule implements Rule
+{
+    public function getNodeType(): string
+    {
+        return ClassConst::class;
+    }
+
+    /**
+     * @return array<int, \PHPStan\Rules\RuleError>
+     */
+    public function processNode(Node $node, Scope $scope): array
+    {
+        if (!$node instanceof ClassConst) {
+            return [];
+        }
+
+        // first lets check if every constant is in separate line
+        if (\count($node->consts) > 1) {
+            return [
+                RuleErrorBuilder::message("There can be only one constant declared per statement.")
+                    ->identifier('extraConstRule')
+                    ->build(),
+            ];
+        }
+
+        $errors = [];
+        $constName = $node->consts[0]->name->toString();
+        $isInherited = $this->constantInherited($constName, $scope);
+
+        if ($isInherited) {
+            return [];
+        }
+
+        if ($node->flags === Modifiers::PROTECTED && !$this->isInAbstractClass($scope)) {
+            $errors[] = RuleErrorBuilder::message("Constant {$constName} should have private visibility.")
+                ->identifier('extraConstRule')
+                ->tip("Protected constants can be used only in Abstract classes or when inherited.")
+                ->build();
+        }
+
+        if ($node->flags === 0) {
+            $errors[] = RuleErrorBuilder::message("Missing visibility keyword for class constant {$constName}.")
+                ->identifier('extraConstRule')
+                ->build();
+        }
+
+        if ($constName !== \strtoupper($constName)) {
+            $errors[] = RuleErrorBuilder::message("Constant name {$constName} must be uppercase.")
+                ->identifier('extraConstRule')
+                ->build();
+        }
+
+        return $errors;
+    }
+
+    private function isInAbstractClass(Scope $scope): bool
+    {
+        $classReflection = $scope->getClassReflection();
+        return $classReflection === null || $classReflection->isAbstract();
+    }
+
+    private function constantInherited(string $constName, Scope $scope): bool
+    {
+        $classReflection = $scope->getClassReflection();
+
+        foreach (\array_merge($classReflection->getParents(), $classReflection->getInterfaces()) as $ancestor) {
+            try {
+                $ancestor->getConstant($constName);
+                return true;
+            } catch (\PHPStan\Reflection\MissingConstantFromReflectionException) {
+                continue;
+            }
+        }
+
+        return false;
+    }
+}
diff --git a/src/Rules/ProtectedPropertyRule.php b/src/Rules/ProtectedPropertyRule.php
new file mode 100644
index 0000000..fe6ae8b
--- /dev/null
+++ b/src/Rules/ProtectedPropertyRule.php
@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PMarki\PHPStanRules\Rules;
+
+use PhpParser\Node;
+use PhpParser\Node\Stmt\Property;
+use PHPStan\Node\ClassPropertyNode;
+use PHPStan\Analyser\Scope;
+use PHPStan\Rules\Rule;
+use PHPStan\Rules\RuleErrorBuilder;
+
+/**
+ * Reports an error when a property is protected in a non-abstract class,
+ * unless it is inherited from a parent class or interface
+ * or when name starts with underscore
+ *
+ * @implements Rule<ClassPropertyNode>
+ */
+class ProtectedPropertyRule implements Rule
+{
+    public function getNodeType(): string
+    {
+        return ClassPropertyNode::class;
+    }
+
+    /**
+     * @return array<int, \PHPStan\Rules\RuleError>
+     */
+    public function processNode(Node $node, Scope $scope): array
+    {
+        if (!$node instanceof ClassPropertyNode) {
+            return [];
+        }
+
+        $errors = [];
+        $propertyName = $node->getName();
+        if ($this->propertyInherited($propertyName, $scope)) {
+            return [];
+        }
+
+        if (\str_starts_with($propertyName, '_')) {
+            $errors[] = RuleErrorBuilder::message("Property name \${$propertyName} must not start with underscore.")
+                ->identifier('extraPropertyRules')
+                ->build();
+        }
+
+        if (!$this->isInAbstractClass($scope) && $node->isProtected()) {
+            $errors[] = RuleErrorBuilder::message("Property \${$propertyName} should have private visibility.")
+                ->identifier('extraPropertyRules')
+                ->tip("Protected properties can be used only in Abstract classes or when inherited.")
+                ->build();
+        }
+
+        return $errors;
+    }
+
+    private function isInAbstractClass(Scope $scope): bool
+    {
+        $classReflection = $scope->getClassReflection();
+        return $classReflection === null || $classReflection->isAbstract();
+    }
+
+    private function propertyInherited(string $propertyName, Scope $scope): bool
+    {
+        $classReflection = $scope->getClassReflection();
+
+        foreach (\array_merge($classReflection->getParents(), $classReflection->getInterfaces()) as $ancestor) {
+            if ($ancestor->hasProperty($propertyName)) {
+                $property = $ancestor->getProperty($propertyName, $scope);
+
+                if (!$property->isPrivate()) {
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
+}
diff --git a/tests/ConstRuleTest.php b/tests/ConstRuleTest.php
new file mode 100644
index 0000000..4c656e1
--- /dev/null
+++ b/tests/ConstRuleTest.php
@@ -0,0 +1,112 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PMarki\PHPStanRules\Tests;
+
+use PHPStan\Rules\Rule;
+use PHPStan\Testing\RuleTestCase;
+use PMarki\PHPStanRules\Rules\ConstRule;
+
+class ConstRuleTest extends RuleTestCase
+{
+    private const TIP = "\n    💡 Protected constants can be used only in Abstract classes or when inherited.";
+
+    public function testNoAbstractClass(): void
+    {
+        $this->analyse(
+            [__DIR__ . '/fixtures/ConstRule/NoAbstractClass.php'],
+            [
+                [
+                    'Missing visibility keyword for class constant ABC.',
+                    6,
+                ],
+                [
+                    'There can be only one constant declared per statement.',
+                    7,
+                ],
+                [
+                    'Constant PROTECTED_CONST should have private visibility.' . self::TIP,
+                    10,
+                ],
+                [
+                    'Constant name lowercase must be uppercase.',
+                    11,
+                ],
+                [
+                    'Missing visibility keyword for class constant foo.',
+                    12,
+                ],
+                [
+                    'Constant name foo must be uppercase.',
+                    12,
+                ],
+            ],
+        );
+    }
+
+    public function testAbstractClass(): void
+    {
+        $this->analyse(
+            [__DIR__ . '/fixtures/ConstRule/AbstractClass.php'],
+            [
+                [
+                    'Missing visibility keyword for class constant ABC.',
+                    6,
+                ],
+                [
+                    'There can be only one constant declared per statement.',
+                    7,
+                ],
+                [
+                    'Constant name lowercase must be uppercase.',
+                    11,
+                ],
+                [
+                    'Missing visibility keyword for class constant foo.',
+                    12,
+                ],
+                [
+                    'Constant name foo must be uppercase.',
+                    12,
+                ],
+            ],
+        );
+    }
+
+    public function testChildClass(): void
+    {
+        $this->analyse(
+            [
+                __DIR__ . '/fixtures/ConstRule/ChildClass.php',
+            ],
+            [
+                [
+                    'There can be only one constant declared per statement.',
+                    7,
+                ],
+                [
+                    'Constant CHILD_PROTECTED_CONST should have private visibility.' . self::TIP,
+                    11,
+                ],
+                [
+                    'Constant name child_lowercase must be uppercase.',
+                    15,
+                ],
+                [
+                    'Missing visibility keyword for class constant child_foo.',
+                    16,
+                ],
+                [
+                    'Constant name child_foo must be uppercase.',
+                    16,
+                ],
+            ],
+        );
+    }
+
+    protected function getRule(): Rule
+    {
+        return new ConstRule();
+    }
+}
diff --git a/tests/ProtectedPropertyRuleTest.php b/tests/ProtectedPropertyRuleTest.php
new file mode 100644
index 0000000..35818dd
--- /dev/null
+++ b/tests/ProtectedPropertyRuleTest.php
@@ -0,0 +1,77 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PMarki\PHPStanRules\Tests;
+
+use PHPStan\Rules\Rule;
+use PHPStan\Testing\RuleTestCase;
+use PMarki\PHPStanRules\Rules\ProtectedPropertyRule;
+
+class ProtectedPropertyRuleTest extends RuleTestCase
+{
+    private const TIP = "\n    💡 Protected properties can be used only in Abstract classes or when inherited.";
+
+    public function testNoAbstractClass(): void
+    {
+        $this->analyse(
+            [__DIR__ . '/fixtures/ProtectedPropertyRule/NoAbstractClass.php'],
+            [
+                [
+                    'Property $protectedProperty should have private visibility.' . self::TIP,
+                    6,
+                ],
+                [
+                    'Property name $_nameWithUnderscore must not start with underscore.',
+                    13,
+                ],
+                [
+                    'Property $protectedPromoted should have private visibility.' . self::TIP,
+                    17,
+                ],
+            ],
+        );
+    }
+
+    public function testAbstractClass(): void
+    {
+        $this->analyse(
+            [__DIR__ . '/fixtures/ProtectedPropertyRule/AbstractClass.php'],
+            [
+                [
+                    'Property name $_nameWithUnderscore must not start with underscore.',
+                    13,
+                ],
+            ],
+        );
+    }
+
+    public function testChildClass(): void
+    {
+        $this->analyse(
+            [
+                __DIR__ . '/fixtures/ProtectedPropertyRule/ChildClass.php',
+            ],
+            [
+                [
+                    'Property $protectedChild should have private visibility.' . self::TIP,
+                    9,
+                ],
+                [
+                    'Property name $_nameWithUnderscore must not start with underscore.',
+                    14,
+                ],
+
+                [
+                    'Property $protectedChildPromoted should have private visibility.' . self::TIP,
+                    19,
+                ],
+            ],
+        );
+    }
+
+    protected function getRule(): Rule
+    {
+        return new ProtectedPropertyRule();
+    }
+}
diff --git a/tests/fixtures/ConstRule/AbstractClass.php b/tests/fixtures/ConstRule/AbstractClass.php
new file mode 100644
index 0000000..15e16fc
--- /dev/null
+++ b/tests/fixtures/ConstRule/AbstractClass.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace ConstRules;
+
+abstract class AbstractClass {
+    const ABC = 1; // missing visibility
+    const CDE = 1, // only one per statement
+        EFG = 2;
+    public const PUBLIC_CONST = 1; // good
+    protected const PROTECTED_CONST = 1; // good
+    public const lowercase = 1; // must be uppercase
+    const foo = 1; // must be uppercase and missing modifier
+}
diff --git a/tests/fixtures/ConstRule/ChildClass.php b/tests/fixtures/ConstRule/ChildClass.php
new file mode 100644
index 0000000..0f2904d
--- /dev/null
+++ b/tests/fixtures/ConstRule/ChildClass.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace ConstRules;
+
+class ChildClass extends AbstractClass {
+    const ABC = 1; // Good, inherited
+    const CDE = 1, // only one per statement
+        EFG = 2;
+    public const CHILD_PUBLIC_CONST = 1; // good
+    protected const PROTECTED_CONST = 1; // good, inherited
+    protected const CHILD_PROTECTED_CONST = 1; // no protected
+    public const lowercase = 1; // Good, inherited
+    const foo = 1; // Good, inherited
+
+    public const child_lowercase = 1; // must be uppercase
+    const child_foo = 1; // must be uppercase and missing modifier
+}
diff --git a/tests/fixtures/ConstRule/NoAbstractClass.php b/tests/fixtures/ConstRule/NoAbstractClass.php
new file mode 100644
index 0000000..e589396
--- /dev/null
+++ b/tests/fixtures/ConstRule/NoAbstractClass.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace ConstRules;
+
+class NoAbstractClass {
+    const ABC = 1; // missing visibility
+    const CDE = 1, // only one per statement
+        EFG = 2;
+    public const PUBLIC_CONST = 1; // good
+    protected const PROTECTED_CONST = 1; // no protected
+    public const lowercase = 1; // must be uppercase
+    const foo = 1; // must be uppercase and missing modifier
+}
diff --git a/tests/fixtures/ProtectedPropertyRule/AbstractClass.php b/tests/fixtures/ProtectedPropertyRule/AbstractClass.php
new file mode 100644
index 0000000..f493b46
--- /dev/null
+++ b/tests/fixtures/ProtectedPropertyRule/AbstractClass.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace PropertyRules;
+
+abstract class AbstractClass {
+    protected $protectedProperty; // good
+    public $publicProperty; // good
+    private $privateProperty; // good
+
+    private $p1, // good, one per statement
+        $p2;
+
+    private $_nameWithUnderscore; // bad
+
+    public function __construct(
+        private $privatePromoted,
+        protected $protectedPromoted,
+    ) {}
+}
diff --git a/tests/fixtures/ProtectedPropertyRule/ChildClass.php b/tests/fixtures/ProtectedPropertyRule/ChildClass.php
new file mode 100644
index 0000000..ef9da8b
--- /dev/null
+++ b/tests/fixtures/ProtectedPropertyRule/ChildClass.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace PropertyRules;
+
+class ChildClass extends AbstractClass {
+    public $publicProperty; // good
+    private $privateProperty; // good
+    protected $protectedProperty; // good
+    protected $protectedChild; // not inherited
+
+    private $p1, // good, one per statement
+        $p2;
+
+    private $_nameWithUnderscore; // bad
+
+    public function __construct(
+        private $privatePromoted,
+        protected $protectedPromoted,
+        protected $protectedChildPromoted,
+    ) {}
+}
diff --git a/tests/fixtures/ProtectedPropertyRule/NoAbstractClass.php b/tests/fixtures/ProtectedPropertyRule/NoAbstractClass.php
new file mode 100644
index 0000000..ba7927a
--- /dev/null
+++ b/tests/fixtures/ProtectedPropertyRule/NoAbstractClass.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace PropertyRules;
+
+class NoAbstractClass {
+    protected $protectedProperty; // bad
+    public $publicProperty; // good
+    private $privateProperty; // good
+
+    private $p1, // good
+        $p2;
+
+    private $_nameWithUnderscore; // bad
+
+    public function __construct(
+        private $privatePromoted,
+        protected $protectedPromoted,
+    ) {}
+}