Bool

ShouldBeTrue and ShouldBeFalse work on boolean values.

ShouldBeTrue

var myValue = false;
myValue.ShouldBeTrue();

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Exception

myValue
    should be
True
    but was
False

ShouldBeFalse

var myValue = true;
myValue.ShouldBeFalse();

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Exception

myValue
    should be
False
    but was
True