send($payment, null)); } public function testSendsReceiptToStudent(): void { Functions\expect('wp_mail') ->once() ->with('a@b.test', Mockery::type('string'), Mockery::type('string')) ->andReturn(true); $student = Mockery::mock(\WP_User::class); $student->user_email = 'a@b.test'; $payment = new Payment(5, 3, Payment::REG_LESSON, 12, 35.00, receiptNumber: 'USC-1'); self::assertTrue((new ReceiptMailer())->send($payment, $student)); } }