本篇延續 Day13 MVVM專案-2 Simple Fragment -1

今天會將昨天沒寫完的instrumented test完成

首先先去以下路徑新增manifest
projectname/app/src/debug/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.ithome11.jetpackmvvmdemo">

    <application>
        <activity android:name=".FragmentTestActivity" />
    </application>

</manifest>

接著要追加一個專門用來測試fragment的activity
projectname/app/src/debug/yourPackageNameInDebugManifest/FragmentTestActivity.kt

@RestrictTo(RestrictTo.Scope.TESTS)
class FragmentTestActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val v = FrameLayout(this).apply {
            id = R.id.container
            layoutParams = FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT
                    , FrameLayout.LayoutParams.MATCH_PARENT)
        }

        setContentView(v)
    }

    inline fun <reified T: androidx.fragment.app.Fragment>replaceFragment(f: T, tag: String = T::class.java.name) {
        supportFragmentManager.beginTransaction()
                .replace(R.id.container, f, tag)
                .commit()
    }

    inline fun <reified T: androidx.fragment.app.Fragment>addFragment(f: T, tag: String = T::class.java.name) {
        supportFragmentManager.beginTransaction()
                .add(R.id.container, f, tag)
                .commit()
    }
}

接著是測試代碼

S02FragmentTest.kt

@RunWith(AndroidJUnit4::class)
class S02FragmentTest {
    @get:Rule
    val rule = object : ActivityTestRule<FragmentTestActivity>(FragmentTestActivity::class.java) {}

    private fun justTrue() = true

    @Before
    fun setFragment() {

        // given
        val createVMFactory = {
            object : ViewModelProvider.Factory {
                @Suppress("UNCHECKED_CAST")
                override fun <T : ViewModel?> create(modelClass: Class<T>): T =
                    Stage02ViewModel(::justTrue).apply {
                        speedOfAnim.value = 10.0f
                    } as T
            }
        }

        rule.activity.replaceFragment(Stage02Fragment.newInstance(createVMFactory))
    }


    @Test
    fun score_should_increase_when_success() {
        // when
        Espresso.onView(withId(R.id.bt_try)).perform(ViewActions.click())
        Espresso.onView(isRoot())
            .perform(ViewAssertionsEx.waiting(1000)) // waiting to end animation

        // then
        val expected =
            String.format(rule.activity.resources.getString(R.string.stage02_score_format), 1)
        Espresso.onView(withId(R.id.tv_score)).check(matches(withText(expected)))
    }

    object ViewAssertionsEx {
        @JvmStatic
        fun waiting(milliSec: Long) = object : ViewAction {
            override fun getDescription(): String = "waiting $milliSec milli seconds"

            override fun getConstraints(): Matcher<View> = isDisplayed()

            override fun perform(uiController: UiController, view: View) =
                uiController.loopMainThreadForAtLeast(milliSec)
        }
    }
}

其中 createVMFactory 其實是把之前Stage02ViewModelFactory創建的Factory給替換掉了

class Stage02ViewModelFactory : ViewModelProvider.Factory {

    private fun randomBooleanGenerator(): () -> Boolean {
        val r = Random()
        return { r.nextBoolean() }
    }

    @Suppress("UNCHECKED_CAST")
    override fun <T : ViewModel?> create(modelClass: Class<T>): T = when (modelClass) {
        Stage02ViewModel::class.java -> Stage02ViewModel(randomBooleanGenerator())
        else -> throw IllegalArgumentException("$modelClass is not registered ViewModel")
    } as T

}

生成Boolean從亂數替換成總是true
另外viewModel的動畫運行速度也被調快
speedOfAnim.value = 10.0f

最後附上今日代碼
https://github.com/mars1120/jetpackMvvmDemo/tree/mvvm-02-fragment