Enums

Fluent Assertions have several ways to compare enums.

The basic ones, Be and HaveFlag, just calls directly into Enum.Equals and Enum.HasFlag.

enum MyEnum { One = 1, Two = 2, Three = 3}

enum.Should().Be(MyEnum.One);
enum.Should().NotBe(MyEnum.Two);
enum.Should().BeOneOf(MyEnum.One, MyEnum.Two);

regexOptions.Should().HaveFlag(RegexOptions.Global);
regexOptions.Should().NotHaveFlag(RegexOptions.CaseInsensitive);

If you want to compare enums of different types, you can use HaveSameValueAs or HaveSameNameAs depending on how you define equality for different enums.

enum SameNameEnum { One = 11 }
enum SameValueEnum { OneOne = 1 }

MyEnum.One.Should().HaveSameNameAs(SameNameEnum.One)
MyEnum.One.Should().HaveSameValueAs(SameValueEnum.OneOne)

MyEnum.One.Should().NotHaveSameNameAs(SameValueEnum.OneOne)
MyEnum.One.Should().NotHaveSameValueAs(SameNameEnum.One)

Lastly, if you want to verify than an enum has a specific integral value, you can use HaveValue.

MyEnum.One.Should().HaveValue(1);
MyEnum.One.Should().NotHaveValue(2);

var myEnum = (MyEnum)1;
myEnum.Should().BeDefined();

myEnum = (MyEnum)99;
myEnum.Should().NotBeDefined();