xUnit2020 Warning

Do not use always-failing boolean assertion to fail a test

Cause

This rule is triggered by using Assert.True(false, "message") or Assert.False(true, "message").

Reason for rule

xUnit.net v2 2.5 introduced Assert.Fail("message") for this purpose. If you are using v2 2.5 or later, this rule will trigger (if you’re using an older version, it will not trigger).

How to fix violations

To fix a violation of this rule, you should use Assert.Fail.

Examples

Violates

using Xunit;

public class xUnit2020
{
    [Fact]
    public void TestMethod()
    {
        Assert.True(false, "Failure message");
    }
}

using Xunit;

public class xUnit2020
{
    [Fact]
    public void TestMethod()
    {
        Assert.False(true, "Failure message");
    }
}

Does not violate

using Xunit;

public class xUnit2020
{
    [Fact]
    public void TestMethod()
    {
        Assert.Fail("Failure message");
    }
}