public void FixAllOneByOneTwoErrorsCorrectFix()
            {
                var code = @"
namespace RoslynSandbox
{
    class Foo
    {
        private readonly int ↓_value1;
        private readonly int ↓_value2;
    }
}";

                var fixedCode = @"
namespace RoslynSandbox
{
    class Foo
    {
        private readonly int value1;
        private readonly int value2;
    }
}";

                AnalyzerAssert.MetadataReferences.Add(MetadataReference.CreateFromFile(typeof(int).Assembly.Location));
                AnalyzerAssert.FixAllOneByOne <FieldNameMustNotBeginWithUnderscore, DontUseUnderscoreCodeFixProvider>(code, fixedCode);
            }