### Question:
StringUtil implements Serializable { public boolean validateEmail(String emailAddress) { if (emailAddress == null || emailAddress.trim().length() > 128) { return false; } emailAddress = emailAddress.trim(); String expression = "^[\\w]([\\-\\.\\w])+[\\w]+@[\\w]+[\\w\\-]+[\\w]*\\.([\\w]+[\\w\\-]+[\\w]*(\\.[a-z][a-z|0-9]*)?)$"; return regExPatternMatch(expression, emailAddress); } StringUtil(); boolean isEmpty(String str); boolean isEmptyOrWildcardAsterisk(String str); boolean equals(String str1, String str2); String toCamelCaseAllWords(String str); boolean validatePassword(String password, String[] invalidValues); boolean validateEmail(String emailAddress); boolean regExPatternMatch(String expression, String inputStr); boolean validateString(String regExStr, String str); String normalizeEmail(String email); String[] split(String value); String[] split(String value, String delimiter); static String trim(String str); boolean isValidName(String name); boolean isEmpty(List<?> list); String getValidUserName(String str); static final public int MIN_PASSWORD_LENGTH; static final public String VALIDATION_NAME; static final public String VALIDATION_TEXT; static final public String VALIDATION_LOGINID; static final public String VALIDATION_ALPHA; static final public String VALIDATION_IP_ADDRESS; static final public String WILDCARD_ASTERISK; }### Answer:
@Test public void testValidateEmailId(){ String email="jitendra.sonkar@freestoneinfotech.com"; boolean value=stringUtil.validateEmail(email); Assert.assertTrue(email.length() < 128); Assert.assertTrue(value); }