minor #37346 Added Unit tests for php 8 union types (derrabus)

This PR was merged into the 3.4 branch.

Discussion
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Added Unit tests for php 8 union types

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | N/A
| License       | MIT
| Doc PR        | N/A

The missing test cases for #37340.

Commits
-------

2ca8ecdb74 Added Unit tests for php 8 union types.

Author: nicolas-grekas

Tests/Compiler/AutowirePassTest.php

@@ -254,6 +254,25 @@ public function testTypeNotGuessableNoServicesFound()
         $pass->process($container);
     }
 
+    /**
+     * @requires PHP 8
+     */
+    public function testTypeNotGuessableUnionType()
+    {
+        $this->expectException('Symfony\Component\DependencyInjection\Exception\AutowiringFailedException');
+        $this->expectExceptionMessage('Cannot autowire service "a": argument "$collision" of method "Symfony\Component\DependencyInjection\Tests\Compiler\UnionClasses::__construct()" has type "Symfony\Component\DependencyInjection\Tests\Compiler\CollisionA|Symfony\Component\DependencyInjection\Tests\Compiler\CollisionB" but this class was not found.');
+        $container = new ContainerBuilder();
+
+        $container->register(CollisionA::class);
+        $container->register(CollisionB::class);
+
+        $aDefinition = $container->register('a', UnionClasses::class);
+        $aDefinition->setAutowired(true);
+
+        $pass = new AutowirePass();
+        $pass->process($container);
+    }
+
     public function testTypeNotGuessableWithTypeSet()
     {
         $container = new ContainerBuilder();
@@ -350,6 +369,40 @@ public function testOptionalParameter()
         $this->assertEquals(Foo::class, $definition->getArgument(2));
     }
 
+    /**
+     * @requires PHP 8
+     */
+    public function testParameterWithNullUnionIsSkipped()
+    {
+        $container = new ContainerBuilder();
+
+        $optDefinition = $container->register('opt', UnionNull::class);
+        $optDefinition->setAutowired(true);
+
+        (new AutowirePass())->process($container);
+
+        $definition = $container->getDefinition('opt');
+        $this->assertNull($definition->getArgument(0));
+    }
+
+    /**
+     * @requires PHP 8
+     */
+    public function testParameterWithNullUnionIsAutowired()
+    {
+        $container = new ContainerBuilder();
+
+        $container->register(CollisionInterface::class, CollisionA::class);
+
+        $optDefinition = $container->register('opt', UnionNull::class);
+        $optDefinition->setAutowired(true);
+
+        (new AutowirePass())->process($container);
+
+        $definition = $container->getDefinition('opt');
+        $this->assertEquals(CollisionInterface::class, $definition->getArgument(0));
+    }
+
     public function testDontTriggerAutowiring()
     {
         $container = new ContainerBuilder();
@@ -459,6 +512,21 @@ public function testScalarArgsCannotBeAutowired()
         (new AutowirePass())->process($container);
     }
 
+    /**
+     * @requires PHP 8
+     */
+    public function testUnionScalarArgsCannotBeAutowired()
+    {
+        $this->expectException('Symfony\Component\DependencyInjection\Exception\AutowiringFailedException');
+        $this->expectExceptionMessage('Cannot autowire service "union_scalars": argument "$timeout" of method "Symfony\Component\DependencyInjection\Tests\Compiler\UnionScalars::__construct()" is type-hinted "int|float", you should configure its value explicitly.');
+        $container = new ContainerBuilder();
+
+        $container->register('union_scalars', UnionScalars::class)
+            ->setAutowired(true);
+
+        (new AutowirePass())->process($container);
+    }
+
     public function testNoTypeArgsCannotBeAutowired()
     {
         $this->expectException('Symfony\Component\DependencyInjection\Exception\AutowiringFailedException');

Tests/Fixtures/includes/autowiring_classes.php

@@ -2,6 +2,10 @@
 
 namespace Symfony\Component\DependencyInjection\Tests\Compiler;
 
+if (PHP_VERSION_ID >= 80000) {
+    require __DIR__.'/uniontype_classes.php';
+}
+
 class Foo
 {
 }

Tests/Fixtures/includes/uniontype_classes.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Symfony\Component\DependencyInjection\Tests\Compiler;
+
+class UnionScalars
+{
+    public function __construct(int|float $timeout)
+    {
+    }
+}
+
+class UnionClasses
+{
+    public function __construct(CollisionA|CollisionB $collision)
+    {
+    }
+}
+
+class UnionNull
+{
+    public function __construct(CollisionInterface|null $c)
+    {
+    }
+}