How to write a test case for Touchable highlight onpress function in react-native using jest and enzyme

Question

So,Here is my code for touchablehighlight,I used simulate for calling a onpress function but is is not working can anyone help me .

 <TouchableHighlight style={styles.touchableButtonview} 
      onPress = {(this.authUser.bind(this))}>
      <Text style={styles.buttonText}>Sign in</Text>
    </TouchableHighlight>