public void When_a_InvalidEnumArgumentException_is_thrown_with_a_message()
{
// Arrange.
IEnsureArg <MyTestEnum> ensureArg = Substitute.For <IEnsureArg <MyTestEnum> >();
ensureArg.Value.Returns((MyTestEnum)(-1));
ensureArg.ArgumentName.Returns("myEnum");
// Act.
Action action = () =>
ensureArg.ThrowInvalidEnumArgumentException("my custom message for an enum of type {enumType.Name}");
// Assert.
action.ShouldThrow <InvalidEnumArgumentException>()
.And
.Message.Should().Be("my custom message for an enum of type MyTestEnum");
}
public static IEnsureArg <TEnum> IsValidEnumValue <TEnum>(
this IEnsureArg <TEnum> ensureArg,
string exceptionMessage = null)
where TEnum : struct, IComparable, IFormattable // Closest we can get to System.Enum and be CLSCompliant.
{
ensureArg.ValidateEnsureArgIsNotNull();
Type enumType = ensureArg.Value.GetType();
if (!enumType.IsEnum)
{
throw new ArgumentException("TEnum must be an enumerated type", "TEnum");
}
if (!Enum.IsDefined(enumType, ensureArg.Value))
{
ensureArg.ThrowInvalidEnumArgumentException(exceptionMessage);
}
return(ensureArg);
}
