### Question:
DuplicateKeyMapValueValidator implements ServiceAttributeValidator { @Override public boolean validate(Set<String> values) { boolean valid = true; if (!CollectionUtils.isEmpty(values)) { for (String val : values) { final String trimmed = val.trim(); if (trimmed.length() > 0) { Matcher matcher = pattern.matcher(trimmed); valid = matcher.matches(); } } } return valid; }  @Override boolean validate(Set<String> values);  }### Answer:
@Test public void testValidateNullValue() { AssertJUnit.assertTrue("Null value valid", validator.validate(inputValues)); }
@Test public void testValidateEmptyValue() { inputValues = Collections.EMPTY_SET; AssertJUnit.assertTrue("Empty value valid", validator.validate(inputValues)); }
@Test public void testValidateDistinctValue() { inputValues = new HashSet(3); inputValues.add("[cn]=userid"); inputValues.add("[uid]=userid"); inputValues.add("[email]=mail"); AssertJUnit.assertTrue("Distinct values valid", validator.validate(inputValues)); }
@Test public void testValidateDuplicateKeyValue() { inputValues = new HashSet(3); inputValues.add("[cn]=userid"); inputValues.add("[cn]=X-Username2"); inputValues.add("[email]=mail"); AssertJUnit.assertTrue("Duplicate keys values valid", validator.validate(inputValues)); }
@Test public void testValidateKeyWithoutValue() { inputValues = new HashSet(1); inputValues.add("[cn]="); AssertJUnit.assertTrue("Key without value is valid", validator.validate(inputValues)); }
@Test public void testValidateDefaultValue() { inputValues = new HashSet(1); inputValues.add("[]="); AssertJUnit.assertTrue("Default value is valid", validator.validate(inputValues)); }
@Test public void testValidateDefaultVariantValue() { inputValues = new HashSet(1); inputValues.add("[ ]="); AssertJUnit.assertTrue("Default variant value is valid", validator.validate(inputValues)); }
@Test public void testValidateKeyWithEqualSign() { inputValues = new HashSet(2); inputValues.add("[abc=123]==someValue"); AssertJUnit.assertTrue("Default variant value is valid", validator.validate(inputValues)); }
@Test public void testValidateValueWithEqualSign() { inputValues = new HashSet(2); inputValues.add("[abc]==someValue=123"); AssertJUnit.assertTrue("Default variant value is valid", validator.validate(inputValues)); }