### Question:
DurationHelper { public static String addFunctionCall(final String value) { return PREFIX + OPEN_BRACKET + QUOTE + value + QUOTE + CLOSE_BRACKET; }  static String addFunctionCall(final String value); static String getFunctionParameter(final String rawValue);  }### Answer:
@Test public void testAddFunctionCall() { final String actual = addFunctionCall("<VALUE>"); final String expected = "duration(\"<VALUE>\")"; assertEquals(expected, actual); }