case err != nil && err != test.expError:
			t.Errorf("Test %d: Expected error: %v, but got: %v", i, test.expError, err)
		}
	}
}

// TestXLStorageFormatFileChange - to test if changing the diskID makes the calls fail.
func TestXLStorageFormatFileChange(t *testing.T) {
	volume := "fail-vol"
	xlStorage, _, err := newXLStorageTestSetup(t)
	if err != nil {
		t.Fatalf("Unable to create xlStorage test setup, %s", err)