GH Actions: merge unit and integration test workflows

... into one workflow, which still has the two separate jobs.

Includes updating the status badge in the `README`.

.github/workflows/integrationtest.yml → .github/workflows/test.yml

@@ -1,4 +1,4 @@
-name: Integration Test
+name: Test
 
 on:
   # Run on pushes to select branches and on all pull requests.
@@ -20,6 +20,69 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  unit-test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php_version: ["7.2", "7.4", "8.0", "8.1", "8.2"]
+
+    name: "Unit Test: PHP ${{ matrix.php_version }}"
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      # The prefix-dependencies task makes use of reflection-based PHP code that only works on PHP > 7.2.
+      - name: Install PHP 7.x for generating the vendor_prefixed directory and dependency injection
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 7.2
+          coverage: none
+
+      - name: Install Composer dependencies, generate vendor_prefixed directory and run dependency injection
+        uses: ramsey/composer-install@v2
+        with:
+          # Bust the cache at least once a week - output format: YYYY-MM-DD.
+          custom-cache-suffix: $(/bin/date -u --date='last Mon' "+%F")
+
+      # Remove packages which are not PHP cross-version compatible and only used for the prefixing.
+      # - humbug/php-scoper is only needed to actually do the prefixing, so won't be shipped anyway.
+      - name: Delete dev dependencies which are not cross-version compatible
+        run: composer remove --dev --no-scripts humbug/php-scoper
+
+      - name: Remove vendor directory
+        run: rm -rf vendor/*
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php_version }}
+          ini-values: zend.assertions=1, error_reporting=-1, display_errors=On
+          coverage: none
+
+      # The PHP platform requirement would prevent updating the test utilities to the appropriate versions.
+      # As long as the `composer update` is run selectively to only update the test utils, removing this is fine.
+      - name: "Composer: remove the PHP platform requirement"
+        run: composer config --unset platform.php
+
+      # Install dependencies and handle caching in one go.
+      # - Updates the test utilities (and only those!) to the most appropriate version
+      #   for the PHP version on which the tests will be run.
+      # @link https://github.com/marketplace/actions/install-composer-dependencies
+      - name: Install Composer dependencies
+        uses: ramsey/composer-install@v2
+        with:
+          # Force a `composer update` run.
+          dependency-versions: "highest"
+          # But make it selective.
+          composer-options: "yoast/wp-test-utils --with-dependencies --no-scripts"
+          # Bust the cache at least once a week - output format: YYYY-MM-DD.
+          custom-cache-suffix: $(/bin/date -u --date='last Mon' "+%F")
+
+      - name: Run unit tests
+        run: composer test
+
   integration-test:
     runs-on: ubuntu-latest
 

README.md

@@ -4,9 +4,9 @@
 [![Lint](https://github.com/Yoast/wordpress-seo/actions/workflows/lint.yml/badge.svg)](https://github.com/Yoast/wordpress-seo/actions/workflows/lint.yml)
 [![LintJS](https://github.com/Yoast/wordpress-seo/actions/workflows/jslint.yml/badge.svg)](https://github.com/Yoast/wordpress-seo/actions/workflows/jslint.yml)
 [![TestJS](https://github.com/Yoast/wordpress-seo/actions/workflows/jstest.yml/badge.svg)](https://github.com/Yoast/wordpress-seo/actions/workflows/jstest.yml)
-[![Unit Tests](https://github.com/Yoast/wordpress-seo/actions/workflows/unittest.yml/badge.svg)](https://github.com/Yoast/wordpress-seo/actions/workflows/unittest.yml)
-[![Integration Tests](https://github.com/Yoast/wordpress-seo/actions/workflows/integrationtest.yml/badge.svg)](https://github.com/Yoast/wordpress-seo/actions/workflows/integrationtest.yml)
+[![Test](https://github.com/Yoast/wordpress-seo/actions/workflows/test.yml/badge.svg)](https://github.com/Yoast/wordpress-seo/actions/workflows/test.yml)
 [![Deployment](https://github.com/Yoast/wordpress-seo/actions/workflows/deploy.yml/badge.svg)](https://github.com/Yoast/wordpress-seo/actions/workflows/deploy.yml)
+
 [![Stable Version](https://poser.pugx.org/yoast/wordpress-seo/v/stable.svg)](https://packagist.org/packages/yoast/wordpress-seo)
 [![License](https://poser.pugx.org/yoast/wordpress-seo/license.svg)](https://packagist.org/packages/yoast/wordpress-seo)