Espresso

Espresso是一種UI Test自動化測試框架，可以在短時間跑完測試並且可以跟元件互動。

ActivityTestRule:取得Activity資源

先尋找元件再調用動作or檢查

尋找UI元件
onView(Matcher)
1.onView(withId()):利用ID。
2.onView(withText()):利用文字。

操作UI動作
perform(ViewActions)
1.perform(typeText()):輸入文字。
2.perform(click()):點擊。
3.perform(clearText()):清空文字。

檢查
check(ViewAssertion(Matcher))
1.check(matches(withId)):是否有這個ID
2.check(matches(withText)):是否有這個文字
3.check(matches(isDisplayed())):是否有顯示

添加 Espresso

build.gradle(Module)

dependencies {
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
    androidTestImplementation 'androidx.test:runner:1.3.0'
    androidTestImplementation 'androidx.test:rules:1.3.0'
}

MainActivity.kt

val secret = Random().nextInt(20)
 
check.setOnClickListener {
      if (secret == number.text.toString().toInt()) {
           AlertDialog.Builder(this)
                .setMessage("賓果")
                .show()
      } else {
           AlertDialog.Builder(this)
                .setMessage("沒猜中")
                .setPositiveButton(getString(R.string.ok), null)
                .show()
      }
}

創建在(androidTest下)
MainActivityTest.kt

@RunWith(AndroidJUnit4ClassRunner::class)
class MainActivityTest {

    @get:Rule
    val activityRule = ActivityScenarioRule(MainActivity::class.java)

    //測試方法
    @Test
    fun guessWrong() {
        val resources = activityRule.activity.resources
        val secret = activityRule.activity.secret
        for (i in 0..19) {
            if (i != secret) {
                //清空文字
                Espresso.onView(withId(R.id.number))
                    .perform(clearText())
                //寫入文字
                Espresso.onView(withId(R.id.number))
                    .perform(typeText(i.toString()))
                //點擊按鈕
                Espresso.onView(withId(R.id.check))
                    .perform(click())
                //判斷文字有沒顯示
                Espresso.onView(withText("沒猜中"))
                   .check(matches(isDisplayed()))
                //按下Alert確認
                Espresso.onView(withText(resources.getString(R.string.ok)))
                    .perform(click())
            }
        }
    }
}