Update code style to use PHP 8.0 features (#2)

* Update code style for PHP 8.0

* Add mutation testing

* Add psalm static type checks

* Remove unsupported features

Raises types to psalm level 2

* Raise psalm level to 1 and totally typed

* Add more tests to squash mutations

* For now reduce required minCoverageMsi

.github/workflows/mutation-tests.yml

@@ -0,0 +1,61 @@
+name: "Mutation tests"
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  mutation-tests:
+    name: "Mutation tests"
+
+    runs-on: ${{ matrix.operating-system }}
+
+    strategy:
+      matrix:
+        dependencies:
+          - "locked"
+        php-version:
+          - "8.0"
+        operating-system:
+          - "ubuntu-latest"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+        with:
+          fetch-depth: 0
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "pcov"
+          php-version: "${{ matrix.php-version }}"
+          ini-values: memory_limit=-1
+          tools: composer:v2, cs2pr
+
+      - name: "Cache dependencies"
+        uses: "actions/cache@v2"
+        with:
+          path: |
+            ~/.composer/cache
+            vendor
+          key: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
+          restore-keys: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
+
+      - name: "Install lowest dependencies"
+        if: ${{ matrix.dependencies == 'lowest' }}
+        run: "composer update --prefer-lowest --no-interaction --no-progress"
+
+      - name: "Install highest dependencies"
+        if: ${{ matrix.dependencies == 'highest' }}
+        run: "composer update --no-interaction --no-progress"
+
+      - name: "Install locked dependencies"
+        if: ${{ matrix.dependencies == 'locked' }}
+        run: "composer install --no-interaction --no-progress"
+
+      - name: "Checkout current HEAD as a named ref"
+        run: "git checkout -b ci-run-branch"
+
+      - name: "Infection"
+        run: "vendor/bin/infection"

.github/workflows/psalm.yml

@@ -0,0 +1,56 @@
+name: "Static Analysis by Psalm"
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  static-analysis-psalm:
+    name: "Static Analysis by Psalm"
+
+    runs-on: ${{ matrix.operating-system }}
+
+    strategy:
+      matrix:
+        dependencies:
+          - "locked"
+        php-version:
+          - "8.0"
+        operating-system:
+          - "ubuntu-latest"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "pcov"
+          php-version: "${{ matrix.php-version }}"
+          ini-values: memory_limit=-1
+          tools: composer:v2, cs2pr
+
+      - name: "Cache dependencies"
+        uses: "actions/cache@v2"
+        with:
+          path: |
+            ~/.composer/cache
+            vendor
+          key: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
+          restore-keys: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
+
+      - name: "Install lowest dependencies"
+        if: ${{ matrix.dependencies == 'lowest' }}
+        run: "composer update --prefer-lowest --no-interaction --no-progress"
+
+      - name: "Install highest dependencies"
+        if: ${{ matrix.dependencies == 'highest' }}
+        run: "composer update --no-interaction --no-progress"
+
+      - name: "Install locked dependencies"
+        if: ${{ matrix.dependencies == 'locked' }}
+        run: "composer install --no-interaction --no-progress"
+
+      - name: "psalm"
+        run: "vendor/bin/psalm --output-format=github --shepherd --stats"

composer.json

@@ -19,7 +19,10 @@
         "php": "8.0.*"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.5"
+        "infection/infection": "^0.24.0",
+        "phpunit/phpunit": "^9.5",
+        "mikey179/vfsstream": "^v1.6.9",
+        "vimeo/psalm": "^4.8.1"
     },
     "autoload": {
         "psr-4": {