code: def wait_for_start(self):
          
          if self.wait_matchers:
              matcher = UnorderedMatcher(*self.wait_matchers)
              self.wait_for_logs_matching(matcher, timeout=self.wait_timeout)
docs: Wait for the container to start.
  
          By default this will wait for the log lines matching the patterns
          passed in the ``wait_patterns`` parameter of the constructor using an
          UnorderedMatcher. For more advanced checks for container startup, this
          method should be overridden.