'cakephp']) extends Mailer { public bool $testIsCalled = false; public function test($to, $subject) { $this->testIsCalled = true; } public function deliver(string $content = ''): array { return []; } }; $mailer->send('test', ['foo', 'bar']); $this->assertSame('cakephp', $mailer->viewBuilder()->getTemplate()); $this->assertTrue($mailer->testIsCalled); } }