### Question:
PHPSimilarText { public static double similarityPercentage(String txt1, String txt2) { double sim = similarityChars(txt1, txt2); return sim * 200.0 / (txt1.length() + txt2.length()); }  static int similarityChars(String txt1, String txt2); static double similarityPercentage(String txt1, String txt2);  }### Answer:
@Test public void testSimilarityPercentage() { logger.info("similarityPercentage"); String txt1 = "this is a fine text"; String txt2 = "this is a great document"; double expResult = 55.813953488372; double result = PHPSimilarText.similarityPercentage(txt1, txt2); assertEquals(expResult, result, Constants.DOUBLE_ACCURACY_HIGH); }