Added tests for "Custom dependency injection handler in Kernel"

Author: WalterWoshid

tests/Functional/Kernel/CustomDependencyInjectionHandler/CustomDependencyInjectionHandlerTest.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Okapi\CodeTransformer\Tests\Functional\Kernel\CustomDependencyInjectionHandler;
+
+use Okapi\CodeTransformer\Tests\Functional\Cache\CachedFileAndDestructor\Target\StringClass;
+use Okapi\CodeTransformer\Tests\Functional\Cache\CachedFileAndDestructor\Transformer\StringTransformer;
+use Okapi\CodeTransformer\Tests\Functional\Kernel\CustomDependencyInjectionHandler\Kernel\CustomDependencyInjectionKernel;
+use Okapi\CodeTransformer\Tests\Util;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
+use PHPUnit\Framework\TestCase;
+
+#[RunTestsInSeparateProcesses]
+class CustomDependencyInjectionHandlerTest extends TestCase
+{
+    /**
+     * @see StringTransformer::transform()
+     */
+    public function testCustomDependencyInjectionHandler(): void
+    {
+        Util::clearCache();
+        CustomDependencyInjectionKernel::init();
+
+        $class = new StringClass();
+
+        $this->assertSame(
+            'Hello from Code Transformer!',
+            $class->test(),
+        );
+    }
+}

tests/Functional/Kernel/CustomDependencyInjectionHandler/Kernel/CustomDependencyInjectionKernel.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Okapi\CodeTransformer\Tests\Functional\Kernel\CustomDependencyInjectionHandler\Kernel;
+
+use Closure;
+use Okapi\CodeTransformer\CodeTransformerKernel;
+use Okapi\CodeTransformer\Tests\Functional\Cache\CachedFileAndDestructor\Transformer\StringTransformer;
+use Okapi\CodeTransformer\Tests\Util;
+
+class CustomDependencyInjectionKernel extends CodeTransformerKernel
+{
+    protected ?string $cacheDir = Util::CACHE_DIR;
+
+    protected function dependencyInjectionHandler(): ?Closure
+    {
+        return function (string $transformerClass) {
+            echo 'Generating transformer instance: ' . $transformerClass . PHP_EOL;
+
+            return new $transformerClass();
+        };
+    }
+
+    protected array $transformers = [
+        StringTransformer::class,
+    ];
+}