Add CI workflow with automated testing and code coverage

.github/workflows/ci.yml

@@ -0,0 +1,102 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+      - develop
+  pull_request:
+    branches:
+      - master
+      - develop
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Test (PHP ${{ matrix.php }})
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['7.4', '8.0', '8.1', '8.2']
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: xdebug
+          tools: composer
+
+      - name: Get Composer cache directory
+        id: composer-cache
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+      - name: Cache Composer dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install PHP dependencies
+        run: composer install --no-interaction --prefer-dist
+
+      - name: Run PHPUnit tests
+        run: vendor/bin/phpunit --colors=always
+
+      - name: Run PHPUnit tests with coverage
+        if: matrix.php == '8.1'
+        run: vendor/bin/phpunit --coverage-clover=coverage.xml --colors=always
+
+      - name: Upload coverage to Codecov
+        if: matrix.php == '8.1'
+        uses: codecov/codecov-action@v4
+        with:
+          files: ./coverage.xml
+          flags: unittests
+          name: codecov-php-${{ matrix.php }}
+          fail_ci_if_error: false
+          token: ${{ secrets.CODECOV_TOKEN }}
+
+  lint:
+    name: Lint (PHP ${{ matrix.php }})
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['7.4', '8.0', '8.1', '8.2']
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          tools: composer, cs2pr
+
+      - name: Get Composer cache directory
+        id: composer-cache
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+      - name: Cache Composer dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install PHP dependencies
+        run: composer install --no-interaction --prefer-dist
+
+      - name: Run PHPCS
+        run: composer run-script lint

.gitignore

@@ -29,3 +29,7 @@ Thumbs.db
 Desktop.ini
 *.js.map
 *.css.map
+
+# PHPUnit
+.phpunit.result.cache
+coverage.xml

README.md

@@ -1,7 +1,7 @@
 Powered Cache
 =============
 
-![Support Level](https://img.shields.io/badge/support-active-green.svg) [![Release Version](https://img.shields.io/wordpress/plugin/v/powered-cache?label=Release%20Version)](https://github.com/poweredcache/powered-cache/releases) ![WordPress tested up to version](https://img.shields.io/wordpress/plugin/tested/powered-cache?label=WordPress) ![Required PHP Version](https://img.shields.io/wordpress/plugin/required-php/powered-cache?label=PHP)
+![Support Level](https://img.shields.io/badge/support-active-green.svg) [![Release Version](https://img.shields.io/wordpress/plugin/v/powered-cache?label=Release%20Version)](https://github.com/poweredcache/powered-cache/releases) ![WordPress tested up to version](https://img.shields.io/wordpress/plugin/tested/powered-cache?label=WordPress) ![Required PHP Version](https://img.shields.io/wordpress/plugin/required-php/powered-cache?label=PHP) [![CI](https://github.com/poweredcache/powered-cache/actions/workflows/ci.yml/badge.svg)](https://github.com/poweredcache/powered-cache/actions/workflows/ci.yml) [![codecov](https://codecov.io/gh/poweredcache/powered-cache/branch/master/graph/badge.svg)](https://codecov.io/gh/poweredcache/powered-cache)
 
 The most powerful caching and performance suite for WordPress. Easily Improve PageSpeed & Web Vitals Score.