AssetPathAndTextUnitNameKeys { public String toKey(String assetPath, String textUnitName) { return assetPath + DELIMITER + textUnitName; }  String toKey(String assetPath, String textUnitName); Key parse(String string);  }
@Test public void toKey() { AssetPathAndTextUnitNameKeys assetPathAndTextUnitNameKeys = new AssetPathAndTextUnitNameKeys(); assertEquals("a1#@#t1", assetPathAndTextUnitNameKeys.toKey("a1", "t1")); }