public void ValidFolderNames() {
InvalidFolderNameFilter filter = new InvalidFolderNameFilter();
string reason;
Assert.That(filter.CheckFolderName("test", out reason), Is.False);
Assert.That(string.IsNullOrEmpty(reason), Is.True, reason);
Assert.That(filter.CheckFolderName("test_test", out reason), Is.False);
Assert.That(string.IsNullOrEmpty(reason), Is.True, reason);
}