public void middleTwo() { assertEquals("Input: middleTwo(\"string\")", "ri", exercises.MiddleTwo("string")); assertEquals("Input: middleTwo(\"code\")", "od", exercises.MiddleTwo("code")); assertEquals("Input: middleTwo(\"Practice\")", "ct", exercises.MiddleTwo("Practice")); assertEquals("Input: middleTwo(\"ab\")", "ab", exercises.MiddleTwo("ab")); assertEquals("Input: middleTwo(\"0123456789\")", "45", exercises.MiddleTwo("0123456789")); }