Stubs

Stubs

// Stubs return canned responses without expectations
class PaymentTest extends TestCase {
    public function testProcessPaymentSuccess(): void {
        // Stub — we control what it returns, no expectations
        $gateway = $this->createStub(PaymentGateway::class);
        $gateway->method("charge")->willReturn(["status" => "success"]);

        $service = new PaymentService($gateway);
        $result  = $service->process(100.00);

        $this->assertEquals("success", $result["status"]);
    }

    public function testProcessPaymentFailure(): void {
        $gateway = $this->createStub(PaymentGateway::class);
        $gateway->method("charge")->willReturn(["status" => "failed"]);

        $service = new PaymentService($gateway);

        $this->expectException(PaymentFailedException::class);
        $service->process(100.00);
    }

    // Stub throwing exceptions
    public function testGatewayError(): void {
        $gateway = $this->createStub(PaymentGateway::class);
        $gateway->method("charge")->willThrowException(new GatewayException("Timeout"));

        $this->expectException(GatewayException::class);
        (new PaymentService($gateway))->process(50.00);
    }
}