public void WriteAllTextShouldOverwriteHiddenFileContent()
{
var path = Path.GetTempFileName();
File.WriteAllText(path, "hi there");
File.SetAttributes(path, FileAttributes.Hidden);
fileSystem.WriteAllText(path, "hi");
Assert.AreEqual("hi", File.ReadAllText(path));
Assert.AreNotEqual(0, File.GetAttributes(path) & FileAttributes.Hidden);
}