infix fun LocalDateTime.shouldHaveDayOfWeek(day: Int): Unit
Asserts that the day of year inputted is equaled the date day
val date = LocalDateTime.of(2019, 2, 15, 12, 0, 0, 0)
date.shouldHaveDayOfWeek(FRIDAY) // Assertion passes
date.shouldHaveDayOfWeek(5) // Assertion passes
infix fun LocalDateTime.shouldHaveDayOfWeek(day: DayOfWeek): Unit