Autolabel bot test #3

[fgreinacher]

Using version 4.1.6 from NuGet, Windows, xUnit

• In an xUnit test I have a MockFileSystem field
• In the test constructor I have a MockFileSystem(IDictionary, string) constructor call
• This constructor throws:
  • System.ArgumentOutOfRangeException : Index was out of range. Must be non-negative and less than the size of the collection.
  • Parameter name: startIndex
  • Stack trace: 
    • at System.String.IndexOf(String value, Int32 startIndex, Int32 count, StringComparison comparisonType)
    • at System.IO.Abstractions.TestingHelpers.MockFileSystem.AddDirectory(String path
    • at System.IO.Abstractions.TestingHelpers.MockFileSystem..ctor(IDictionary`2 files, String currentDirectory)

Relevant lines:

            _darkFile = Path.Combine("baseDir", "subDir", "darkFile");
            _brightFile = Path.Combine("baseDir", "subDir", "brightFile");
            _defectFile = Path.Combine("baseDir", "subDir", "defectFile");
            _correction = new Mock<ICorrection>();
            _fs = new MockFileSystem(
                new Dictionary<string, MockFileData>
                {
                    { _darkFile, new MockFileData(string.Empty) },
                    { _brightFile, new MockFileData(string.Empty) },
                    { _defectFile, new MockFileData(string.Empty) },
                }, "."); // When I use the default `""`, no exception is thrown

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