public void MemoryFileSystemProvider_CreateText_CreatesNewFileAndTextWriter() { var provider = new MemoryFileSystemProvider(); using (var textWriter = provider.CreateText("input.dat")) { textWriter.Write("test-content"); textWriter.Close(); } Assert.True(provider.FileExists("input.dat")); Assert.Equal("test-content", provider.OpenText("input.dat").ReadToEnd()); }