xunit Assert.NotNull() does not play nicely with C# nullable types

user_77733 0
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Assert.NotNull(res);
Assert.Equal(1, res.Foo); // CS8602 warning here

I'm using xunit.assert 2.4.1, .NET 6.0, VS 2022.

When "Ctrl+Click" navigating to the Assert.NotNull() source code I can see it defined as

public static void NotNull(object @object)

while I was actually expecting to see

public static void NotNull([NotNull] object? @object)

From the xunit source code one can see that nullable flavour of methods are used only when XUNIT_NULLABLE conditional compilation variable is enabled. Can it be that nuget downloaded "non-nullable" version of the xunit.assert package? How can we force a "nullable" version (built with the XUNIT_NULLABLE defined)?

nullable-reference-types xunit
1 Answers

Finally, xunit 2.4.2 has been released and Assert.NotNull() plays nicely with C# nullable types!!

The following code is the implementation of NotNull method in xunit.assert 2.4.2.

        /// <summary>
        /// Verifies that an object reference is not null.
        /// </summary>
        /// <param name="object">The object to be validated</param>
        /// <exception cref="NotNullException">Thrown when the object reference is null</exception>
#if XUNIT_NULLABLE
        public static void NotNull([NotNull] object? @object)
#else
        public static void NotNull(object @object)
#endif
        {
            if (@object == null)
                throw new NotNullException();
        }
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