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templates/example-tests/ExampleUnitTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Unit\Domain\Validator;
+
+use TYPO3\TestingFramework\Core\Unit\UnitTestCase;
+use Vendor\Extension\Domain\Validator\EmailValidator;
+
+/**
+ * Example unit test demonstrating TYPO3 testing patterns
+ *
+ * Unit tests are fast, isolated tests without external dependencies.
+ * They test individual components (validators, utilities, domain logic).
+ */
+final class EmailValidatorTest extends UnitTestCase
+{
+    protected EmailValidator $subject;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->subject = new EmailValidator();
+    }
+
+    /**
+     * @test
+     */
+    public function validEmailPassesValidation(): void
+    {
+        $result = $this->subject->validate('user@example.com');
+
+        self::assertFalse($result->hasErrors());
+    }
+
+    /**
+     * @test
+     */
+    public function invalidEmailFailsValidation(): void
+    {
+        $result = $this->subject->validate('invalid-email');
+
+        self::assertTrue($result->hasErrors());
+    }
+
+    /**
+     * @test
+     * @dataProvider invalidEmailProvider
+     */
+    public function rejectsInvalidEmails(string $email): void
+    {
+        $result = $this->subject->validate($email);
+
+        self::assertTrue($result->hasErrors(), "Email '$email' should be invalid");
+    }
+
+    public static function invalidEmailProvider(): array
+    {
+        return [
+            'missing @' => ['userexample.com'],
+            'missing domain' => ['user@'],
+            'empty string' => [''],
+            'spaces' => ['user @example.com'],
+        ];
+    }
+}