App.js

import { StatusBar } from "expo-status-bar"
import { useState } from "react"
import { Pressable, StyleSheet, Text, View } from "react-native"

export default function App() {
  const [clicked, setClicked] = useState(false)

  return (
    <View style={styles.container}>
      {!clicked && (
        <Pressable
          testID="click-me-button"
          style={styles.button}
          onPress={() => setClicked(true)}
        >
          <Text style={styles.text}>Click me</Text>
        </Pressable>
      )}
      {clicked && <Text style={styles.hi}>Hi!</Text>}
      <StatusBar style="auto" />
    </View>
  )
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#fff",
    alignItems: "center",
    justifyContent: "center",
  },
  hi: {
    fontSize: 30,
    color: "#4630EB",
  },
  button: {
    alignItems: "center",
    justifyContent: "center",
    paddingVertical: 12,
    paddingHorizontal: 32,
    borderRadius: 4,
    elevation: 3,
    backgroundColor: "#4630EB",
  },
  text: {
    fontSize: 16,
    lineHeight: 21,
    fontWeight: "bold",
    letterSpacing: 0.25,
    color: "white",
  },
})