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Unit Testing of Refactorings

NuGet Package​

dotnet add package roslynator.testing.csharp.xunit

or

dotnet add package roslynator.testing.csharp.mstest

Example: Test Refactoring​

using Roslynator.Testing.CSharp.Xunit;
using Xunit;

public class AddArgumentNameTests : XunitRefactoringVerifier<AddArgumentNameCodeRefactoringProvider>
{
    [Fact]
    public async Task Test()
    {
        await VerifyRefactoringAsync(
            source: @"
class C
{
    void M()
    {
        var arr = new[]
        {
            new string(
                [|' ',
                1|])
        };
    }
}
",
            expectedSource: @"
class C
{
    void M()
    {
        var arr = new[]
        {
            new string(
                c: ' ',
                count: 1)
        };
    }
}
");
    }
}

How to Mark Selected Text​

Selected text is marked directly in a test code using [| and |] tokens.

How to Add Config Options​

Each test method has parameter options of type TestOptions:

options: Options.AddConfigOption("option_key", "option_value")