xUnit1006 v2 v3 Warning

Theory methods should have parameters

Cause

A theory method does not have any parameters.

Reason for rule

Theories are tests which are only true for a particular set of data. As such, they need to be provided with that data. xUnit.net does this by passing test data to a theory method via its parameters. Therefore, if the test method does not declare any parameters, there is no way for xUnit.net to pass the test data to the theory.

How to fix violations

To fix a violation of this rule, either convert the test to a Fact, or add parameters to the test method. When adding parameters, the parameter count and types should match the provided test data.

Examples

Violates

using Xunit;

public class xUnit1006
{
    [Theory]
    [InlineData(12, "book")]
    public void TestMethod()
    { }
}

Does not violate

using Xunit;

public class xUnit1006
{
    [Fact]
    public void TestMethod()
    { }
}

using Xunit;

public class xUnit1006
{
    [Theory]
    [InlineData(12, "book")]
    public void TestMethod(int quantity, string productType)
    { }
}