assertEquals( "MONTHLY", $payment_schedule->getInterval() ); $this->assertEquals(15, $payment_schedule->getIntervalExecutionDay()); $this->assertEquals( "2020-10-01", $payment_schedule->getStartDate()->format("Y-m-d") ); } public function test_invalid_interval_throws_invalid_argument_exception(): void { $this->expectException(InvalidArgumentException::class); new PaymentSchedule("YEARLY", 1, new DateTime("2020-01-01")); } }