public void Test_VariablePathBrowsing_FileUntyped() { IFilePath file = @"$(Var)\File.txt".ToVariableFilePath(); Assert.IsTrue(file.GetBrotherFileWithName("MyFile.exe").ToString() == @"$(Var)\MyFile.exe"); Assert.IsTrue(file.GetBrotherDirectoryWithName("Dir").ToString() == @"$(Var)\Dir"); Assert.IsTrue(file.UpdateExtension(".bin").ToString() == @"$(Var)\File.bin"); }