PHP 単体テスト: 保守可能なテスト コードを作成するためのヒント

class MyClassTest extends TestCase
{
    public function testSomething(): void
    {
        // ...
    }
}

public function testMethodA(): void
{
    // ...
}

public function testMethodB(): void
{
    // ...
}

$this->assertEquals('expected', $actual);
$this->assertContains('foo', $array);

private function assertSomethingTrue(bool $condition)
{
    $this->assertTrue($condition);
}

public function dataProvider(): array
{
    return [
        ['input' => 'foo', 'expected' => 'BAR'],
        ['input' => 'bar', 'expected' => 'BAZ'],
    ];
}

/**
 * @dataProvider dataProvider
 */
public function testSomething(string $input, string $expected): void
{
    // ...
}

// Bad
$this->assertEquals(1, $foo->getCount());

// Good
$this->assertEquals(1, $objectUnderTest->getCounter());

function sum(int $a, int $b): int
{
    return $a + $b;
}

class SumFunctionTest extends TestCase
{
    public function testSum(): void
    {
        $this->assertEquals(5, sum(2, 3));
        $this->assertEquals(7, sum(3, 4));
    }
}