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C# Language Enum Test flags-style enum values with bitwise logic
Example
A flags-style enum value needs to be tested with bitwise logic because it may not match any single value.
[Flags]
enum FlagsEnum
{
Option1 = 1,
Option2 = 2,
Option3 = 4,
Option2And3 = Option2 | Option3;
Default = Option1 | Option3,
}
The Default value is actually a combination of two others merged with a bitwise OR. Therefore to test for the presence of a flag we need to use a bitwise AND.
var value = FlagsEnum.Default;
bool isOption2And3Set = (value & FlagsEnum.Option2And3) == FlagsEnum.Option2And3;
Assert.True(isOption2And3Set);
