public void ShouldBeValidWhenDateIsNull()
{
// Arrange
var attr = new DateFormatValidationAttribute();
var date = (object)null;
// Act
var isValid = attr.IsValid(date);
// Assert
Assert.True(isValid);
}
public void ShouldUseDateHelperToValidate()
{
// Arrange
var dateHelperMock = new Mock <DateHelper>(MockBehavior.Strict);
var attr = new DateFormatValidationAttribute(dateHelperMock.Object);
var dateStr = "2020/10/10";
var expected = false;
dateHelperMock.Setup(i => i.IsValid(dateStr)).Returns(expected);
// Act
var actual = attr.IsValid(dateStr);
// Assert
Assert.Equal(expected, actual);
dateHelperMock.Verify(i => i.IsValid(dateStr), Times.Once());
}