code: def element_text_should_be(self, locator, expected, message=''):
          
          self._info("Verifying element '%s' contains exactly text '%s'."
                      % (locator, expected))
          element = self._element_find(locator, True, True)
          actual = element.text
          if expected != actual:
              if not message:
                  message = "The text of element '%s' should have been '%s' but "\
                            "in fact it was '%s'." % (locator, expected, actual)
              raise AssertionError(message)
docs: Verifies element identified by ``locator`` exactly contains text ``expected``.
  
          In contrast to `Element Should Contain Text`, this keyword does not try
          a substring match but an exact match on the element identified by ``locator``.
  
          ``message`` can be used to override the default error message.
  
          New in AppiumLibrary 1.4.