Isolate compatability tests.

.github/workflows/main.yml

@@ -89,11 +89,11 @@ jobs:
 
             # There's no reason to generate coverage data on multiple jobs--the result should be the same.
             -   name: "Run core tests without coverage"
-                run: "./vendor/bin/phpunit --no-coverage --exclude-group=windows_only"
+                run: "./vendor/bin/phpunit --no-coverage --testsuite=all --exclude-group=windows_only"
                 if: ${{ runner.os != 'Windows' && !( matrix.os == 'ubuntu' && matrix.dependencies == 'high' && matrix.php == '8.3' ) }}
 
             -   name: "Run Windows tests"
-                run: "./vendor/bin/phpunit --no-coverage --exclude-group=no_windows"
+                run: "./vendor/bin/phpunit --no-coverage --testsuite=all --exclude-group=no_windows"
                 if: ${{ runner.os == 'Windows' }}
 
     performance:
@@ -122,6 +122,28 @@ jobs:
             -   name: "Run performance tests"
                 run: "composer phpbench -- --progress=plain --ansi"
 
+    compatability:
+        name: "Compatability"
+        runs-on: ubuntu-latest
+        steps:
+            -   name: "Install rsync"
+                uses: GuillaumeFalourd/setup-rsync@v1.2 # https://github.com/marketplace/actions/setup-rsync
+
+            -   name: "Set up PHP"
+                uses: shivammathur/setup-php@v2 # https://github.com/marketplace/actions/setup-php-action
+                with:
+                    php-version: "8.3"
+                    coverage: none
+
+            -   name: "Checkout code"
+                uses: actions/checkout@v4 # https://github.com/marketplace/actions/checkout
+
+            -   name: "Install dependencies"
+                uses: ramsey/composer-install@v3 # https://github.com/marketplace/actions/install-composer-dependencies
+
+            -   name: "Run compatability tests"
+                run: "composer compatability"
+
     mutation:
         name: "Mutation"
         runs-on: ubuntu-latest

composer.json

@@ -91,7 +91,7 @@
             "rm -r var/*/* &> /dev/null || true",
             "git checkout -- var"
         ],
-        "compatability": "phpunit -- tests/Compatability",
+        "compatability": "phpunit --testsuite=compatability",
         "dox": "phpunit --testdox --color=always --exclude-group=windows_only",
         "fast": "phpunit --exclude-group=slow,windows_only",
         "functional": "phpunit --testsuite=functional --exclude-group=windows_only",

grumphp.yml.dist

@@ -25,6 +25,7 @@ grumphp:
         phpstan:
             use_grumphp_paths: false
         phpunit:
+            testsuite: all
             exclude_group:
                 - windows_only
         rector: ~

infection.json5.dist

@@ -18,5 +18,5 @@
         "IncrementInteger": false,
         "RoundingFamily": false
     },
-    "testFrameworkOptions": "--exclude-group=slow,windows_only"
+    "testFrameworkOptions": "--testsuite=all --exclude-group=slow,windows_only"
 }

phpunit.xml.dist

@@ -16,7 +16,8 @@
 >
     <testsuites>
         <testsuite name="all">
-            <directory>tests</directory>
+            <directory suffix="UnitTest.php">tests</directory>
+            <directory suffix="FunctionalTest.php">tests</directory>
         </testsuite>
         <testsuite name="unit">
             <directory suffix="UnitTest.php">tests</directory>

tests/Compatability/CompatabilityFunctionalTest.php → tests/Compatability/CompatabilityTest.php

@@ -6,12 +6,8 @@
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\Process\Process;
 
-/**
- * @coversNothing
- *
- * @group slow
- */
-final class CompatabilityFunctionalTest extends TestCase
+/** @coversNothing */
+final class CompatabilityTest extends TestCase
 {
     // @see https://github.com/php-tuf/composer-stager/wiki/Library-compatibility-policy#drupal
     private const SUPPORTED_DRUPAL_VERSIONS = [