for i, test := range dekEncodeDecodeTests {
		text, err := test.Key.MarshalText()
		if err != nil {
			t.Fatalf("Test %d: failed to marshal DEK: %v", i, err)
		}

		var key DEK
		if err = key.UnmarshalText(text); err != nil {
			t.Fatalf("Test %d: failed to unmarshal DEK: %v", i, err)
		}
		if key.Plaintext != nil {
			t.Fatalf("Test %d: unmarshaled DEK contains non-nil plaintext", i)
		}