PHPUnit Best Practices Deep Dive

Advanced Best Practices

// 1. Test names should describe expected behavior
public function testUserWithExpiredTrialCannotAccessPremium(): void {}

// 2. Use data providers to avoid duplication
#[DataProvider("statusCodes")]
public function testApiReturnsCorrectStatus(string $method, string $url, int $code): void {
    $resp = $this->client->request($method, $url);
    $this->assertEquals($code, $resp->getStatusCode());
}

// 3. Make assertions specific
// Bad: $this->assertTrue($user !== null);
// Good:
$this->assertNotNull($user);
$this->assertEquals("alice@example.com", $user->email);