ValidateTor { public boolean isInteger(String str) { if (str == null) { return false; } int length = str.length(); if (length == 0) { return false; } int i = 0; if (str.charAt(0) == '-') { if (length == 1) { return false; } i = 1; } for (; i < length; i++) { char c = str.charAt(i); if (c < '0' || c > '9') { return false; } } return true; } ValidateTor(); boolean containsSubstring(String str, String seed); boolean isAlpha(String str); boolean isAlphanumeric(String str); boolean isBoolean(String str); boolean isIPAddress(String str); boolean isEmail(String str); boolean isPhoneNumber(String str); boolean isEmpty(String str); boolean isBase64(String str); boolean isDecimal(String str); boolean isAtleastLength(String str, int len); boolean isAtMostLength(String str, int len); boolean isLowercase(String str); boolean isUppercase(String str); boolean isValidMD5(String str); boolean isNumeric(String str); boolean isMACAddress(String str); boolean isJSON(String str); boolean isInteger(String str); boolean isIn(String str, String[] values); boolean isHexadecimal(String str); boolean isPinCode(String str); boolean isHexColor(String str); boolean hasAtleastOneDigit(String str); boolean hasAtleastOneLetter(String str); boolean hasAtleastOneLowercaseCharacter(String str); boolean hasAtleastOneUppercaseCharacter(String str); boolean hasAtleastOneSpecialCharacter(String str); boolean validateCreditCard(String str); CardInformation getCreditCardInfo(String str);  }
@Test public void isInt_shouldReturnTrue_whenStringIsInteger() throws Exception { assertEquals(true, validateTor.isInteger("123")); }
@Test public void isInt_shouldReturnFalse_whenStringIsNotInteger() throws Exception { assertEquals(false, validateTor.isInteger("a12")); assertEquals(false, validateTor.isInteger("abc")); }