Null

ShouldBeNull and ShouldNotBeNull allow you to check whether a value is null.

ShouldNotBeNull returns the non-null value if it succeeds so that further assertions can be chained. When used with a reference type, the returned value is the same reference annotated as non-null. Equivalently, when used on a System.Nullable<T> expression, the returned value is the unwrapped T value.

ShouldBeNull

var myRef = "Hello World";
myRef.ShouldBeNull();

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Exception

myRef
    should be null but was
"Hello World"

ShouldBeNull (nullable value type)

int? nullableValue = 42;
nullableValue.ShouldBeNull();

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Exception

nullableValue
    should be null but was
42

ShouldNotBeNull

string? myRef = null;
myRef.ShouldNotBeNull();

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Exception

myRef
    should not be null but was

ShouldNotBeNull (nullable value type)

int? myRef = null;
myRef.ShouldNotBeNull();

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Exception

myRef
    should not be null but was

ShouldNotBeNull with chaining

var myRef = (string?)"1234";
myRef.ShouldNotBeNull().Length.ShouldBe(5);

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Exception

myRef.ShouldNotBeNull().Length
    should be
5
    but was
4

ShouldNotBeNull with chaining (nullable value type)

SomeStruct? nullableValue = new SomeStruct { IntProperty = 41 };
nullableValue.ShouldNotBeNull().IntProperty.ShouldBe(42);

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Exception

nullableValue.ShouldNotBeNull().IntProperty
    should be
42
    but was
41