}
		if a := f(); a != nil {
			t.Errorf("Redundant removal %d returned %v instead of expected nil", idx, a)
		}
		expected = expected[1:]
		actual := walkAll(list)
		verifyOrder(t, expected, actual)
	}

	if list.Length() != 0 {
		t.Errorf("Expected length: %d, but got: %d)", 0, list.Length())
	}
}

func TestFIFORemoveFromFIFOFunc(t *testing.T) {