### Question:
StringSimilarity { public static double jaroWinkler(CharSequence s1, CharSequence s2) { double jaro = jaro(s1, s2); int commonLength = Math.min(s1.length(), s2.length()); commonLength = Math.min(MAX_PREFIX_LENGTH_BOOST + 1, commonLength); int prefixLength; for (prefixLength = 0; prefixLength < commonLength; prefixLength++) { char ch1 = s1.charAt(prefixLength); char ch2 = s2.charAt(prefixLength); if (ch1 != ch2) { break; } } double jaroWinkler = jaro + (WINKLER_SCALING * prefixLength * (1.0 - jaro)); return Math.min(jaroWinkler, MAX_SCORE); } private  StringSimilarity(); static double jaro(CharSequence s1, CharSequence s2); static double jaroWinkler(CharSequence s1, CharSequence s2);  }### Answer:
@Test void jaroWinklerBothEmpty() { assertEquals(1.0, jaroWinkler("", "")); }
@Test void jaroWinklerFirstEmpty() { assertEquals(0.0, jaroWinkler("", "jaro-winkler")); }
@Test void jaroWinklerSecondEmpty() { assertEquals(0.0, jaroWinkler("distance", "")); }
@Test void jaroWinklerSame() { assertEquals(1.0, jaroWinkler("Jaro-Winkler", "Jaro-Winkler")); }
@Test void jaroWinklerMultibyte() { assertEquals(0.891, jaroWinkler("testabctest", "testöঙ香test"), 0.001); assertEquals(0.891, jaroWinkler("testöঙ香test", "testabctest"), 0.001); }
@Test void jaroWinklerDiffShort() { assertEquals(0.813, jaroWinkler("dixon", "dicksonx"), 0.001); assertEquals(0.813, jaroWinkler("dicksonx", "dixon"), 0.001); }
@Test void jaroWinklerDiffOneCharacter() { assertEquals(0.0, jaroWinkler("a", "b")); }
@Test void jaroWinklerSameOneCharacter() { assertEquals(1.0, jaroWinkler("a", "a")); }
@Test void jaroWinklerDiffNoTransposition() { assertEquals(0.840, jaroWinkler("dwayne", "duane"), 0.001); }
@Test void jaroWinklerDiffWithTransposition() { assertEquals(0.961, jaroWinkler("martha", "marhta"), 0.001); }
@Test void jaroWinklerNames() { assertEquals(0.562, jaroWinkler( "Friedrich Nietzsche", "Fran-Paul Sartre" ), 0.001); }
@Test void jaroWinklerLongPrefix() { assertEquals(0.889, jaroWinkler("cheeseburger", "cheese fries"), 0.001); }
@Test void jaroWinklerMoreNames() { assertEquals(0.868, jaroWinkler("Thorkel", "Thorgier"), 0.001); }
@Test void jaroWinklerLengthOfOne() { assertEquals(0.738, jaroWinkler("Dinsdale", "D"), 0.001); }
@Test void jaroWinklerVeryLongPrefix() { assertEquals(0.988, jaroWinkler( "thequickbrownfoxjumpedoverx", "thequickbrownfoxjumpedovery" ), 0.001); }