public void doubleX() { assertEquals("Input: doubleX(\"axxbb\")", true, exercises.DoubleX("axxbb")); assertEquals("Input: doubleX(\"axaxax\")", false, exercises.DoubleX("axaxax")); assertEquals("Input: doubleX(\"xxxxx\")", true, exercises.DoubleX("xxxxx")); assertEquals("Input: doubleX(\"xaxxx\")", false, exercises.DoubleX("xaxxx")); assertEquals("Input: doubleX(\"aaaax\")", false, exercises.DoubleX("aaaax")); assertEquals("Input: doubleX(\"\")", false, exercises.DoubleX("")); assertEquals("Input: doubleX(\"abc\")", false, exercises.DoubleX("abc")); assertEquals("Input: doubleX(\"x\")", false, exercises.DoubleX("x")); assertEquals("Input: doubleX(\"xx\")", true, exercises.DoubleX("xx")); assertEquals("Input: doubleX(\"xax\")", false, exercises.DoubleX("xax")); assertEquals("Input: doubleX(\"xaxx\")", false, exercises.DoubleX("xaxx")); }