Add tests

tests/unit/Util/PHP/DefaultJobRunnerTest.php

@@ -0,0 +1,104 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PHPUnit\Util\PHP;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\Small;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(DefaultJobRunner::class)]
+#[UsesClass(Job::class)]
+#[UsesClass(Result::class)]
+#[Small]
+final class DefaultJobRunnerTest extends TestCase
+{
+    public static function provider(): array
+    {
+        return [
+            'output to stdout' => [
+                new Result('test', ''),
+                new Job(
+                    <<<'EOT'
+<?php declare(strict_types=1);
+fwrite(STDOUT, 'test');
+
+EOT
+                ),
+            ],
+            'output to stderr: yes' => [
+                new Result('', 'test'),
+                new Job(
+                    <<<'EOT'
+<?php declare(strict_types=1);
+fwrite(STDERR, 'test');
+
+EOT
+                ),
+            ],
+            'output to stdout and stderr' => [
+                new Result('test-stdout', 'test-stderr'),
+                new Job(
+                    <<<'EOT'
+<?php declare(strict_types=1);
+fwrite(STDOUT, 'test-stdout');
+fwrite(STDERR, 'test-stderr');
+
+EOT
+                ),
+            ],
+            'redirect stderr to stdout' => [
+                new Result('test', ''),
+                new Job(
+                    <<<'EOT'
+<?php declare(strict_types=1);
+fwrite(STDERR, 'test');
+
+EOT,
+                    redirectErrors: true,
+                ),
+            ],
+            'environment variables' => [
+                new Result('test', ''),
+                new Job(
+                    <<<'EOT'
+<?php declare(strict_types=1);
+print getenv('test');
+
+EOT,
+                    environmentVariables: ['test' => 'test'],
+                ),
+            ],
+            'arguments' => [
+                new Result('test', ''),
+                new Job(
+                    <<<'EOT'
+<?php declare(strict_types=1);
+print $argv[1];
+
+EOT,
+                    arguments: ['test'],
+                ),
+            ],
+        ];
+    }
+
+    #[DataProvider('provider')]
+    public function testRunsJobInSeparateProcess(Result $expected, Job $job): void
+    {
+        $jobRunner = new DefaultJobRunner;
+
+        $result = $jobRunner->run($job);
+
+        $this->assertSame($expected->stdout(), $result->stdout());
+        $this->assertSame($expected->stderr(), $result->stderr());
+    }
+}