@Test
 public void englishIsUpperLowerCase() {
   String allValues =
       "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890~`!@#$%^&*()_-+=[]{};<>,.?/|";
   String jdkUpper = allValues.toUpperCase();
   String upper = StringIterate.englishToUpperCase(allValues);
   Assert.assertEquals(jdkUpper.length(), upper.length());
   Assert.assertEquals(jdkUpper, upper);
   String jdkLower = allValues.toLowerCase();
   String lower = StringIterate.englishToLowerCase(allValues);
   Assert.assertEquals(jdkLower.length(), lower.length());
   Assert.assertEquals(jdkLower, lower);
 }
 @Test
 public void englishToLowerCase() {
   Assert.assertEquals("abc", StringIterate.englishToLowerCase("ABC"));
   Assert.assertEquals("a,b,c", StringIterate.englishToLowerCase("A,B,C"));
   Assert.assertSame("a,b,c", StringIterate.englishToLowerCase("a,b,c"));
 }
 @Test
 public void englishToUpperLowerCase() {
   Assert.assertEquals("ABC", StringIterate.englishToUpperCase("abc"));
   Assert.assertEquals("abc", StringIterate.englishToLowerCase("ABC"));
 }