Flags

ShouldHaveFlag allows you to assert whether an object is an enum and has a flag specified.

Conversely ShouldNotHaveFlag allows you to assert the opposite; that an object is an enum but does not have a flag specified.

ShouldHaveFlag

var actual = TestEnum.FlagTwo;
var value = TestEnum.FlagOne;
actual.ShouldHaveFlag(value);

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Exception

actual
    should have flag
TestEnum.FlagOne
    but had
TestEnum.FlagTwo

ShouldNotHaveFlag

var actual = TestEnum.FlagOne;
var value = TestEnum.FlagOne;
actual.ShouldNotHaveFlag(value);

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Exception

actual
    should not have flag
TestEnum.FlagOne
    but it had
TestEnum.FlagOne