assertNotNull("Object of PatternConstraintImpl shouldn't be null.", patternConstraint);
assertEquals("Description should be 'test description'.", "test description", patternConstraint.getDescription());
assertEquals("Error app tag shouldn't be null.", "invalid-regular-expression", patternConstraint.getErrorAppTag());
- assertTrue("Error message should be empty.", patternConstraint.getErrorMessage().isEmpty());
+ assertNotNull(patternConstraint.getErrorMessage());
assertEquals("Reference should be equals 'RFC 6020'.", "RFC 6020", patternConstraint.getReference());
assertEquals("Regular expression should be equls '\\D'.", "\\D", patternConstraint.getRegularExpression());
assertNotEquals("Hash codes shouldn't be equals.", patternConstraint.hashCode(), patternConstraint2.hashCode());