xUnit2024 v2 v3 Info

Do not use boolean asserts for simple equality tests

Cause

You should not use boolean assertions (like Assert.True or Assert.False) with simple equality comparisons against literal values like null, numeric constants, or enum values.

Reason for rule

The error message provided when the assertion fails is less useful, since it merely indicates that you expected a value to be true or false. Using a better assertion (like Assert.Equal) will provide a better user experience, because it will show you the actual values in question when the comparison fails.

How to fix violations

To fix a violation of this rule, replace the boolean assertion with one more appropriate (including Assert.Equal, Assert.NotEqual, Assert.Null, or Assert.NotNull);

Examples

Violates

using Xunit;

public class xUnit2024
{
    [Fact]
    public void TestMethod()
    {
        var x = 42;

        Assert.True(x == 2112);
    }
}

using Xunit;

public class xUnit2024
{
    [Fact]
    public void TestMethod()
    {
        var x = new object();

        Assert.True(x != null);
    }
}

Does not violate

using Xunit;

public class xUnit2024
{
    [Fact]
    public void TestMethod()
    {
        var x = 42;

        Assert.Equal(2112, x);
    }
}

using Xunit;

public class xUnit2024
{
    [Fact]
    public void TestMethod()
    {
        var x = new object();

        Assert.NotNull(x);
    }
}