Question

我有以下导航图startDestination作为card_list：

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/nav_graph"
    app:startDestination="@id/card_list">
    <fragment
        android:id="@+id/card_list"
        android:name="bbct.android.common.fragment.BaseballCardList"
        android:label="@string/app_name"
        tools:layout="@layout/card_list">
        <action
            android:id="@+id/action_details"
            app:destination="@id/card_details" />
    </fragment>
    <fragment
        android:id="@+id/card_details"
        android:name="bbct.android.common.fragment.BaseballCardDetails"
        android:label="@string/card_details_title"
        tools:layout="@layout/card_details">
        <argument
            android:name="id"
            app:argType="long" />
    </fragment>
</navigation>

现在我想从card_details开始编写一个测试：

public class NavigationTest {
    @Test
    public void clickOnSaveNavigatesFromDetailsBackToList() {
        TestNavHostController navController = new TestNavHostController(ApplicationProvider.getApplicationContext());
        FragmentScenario<BaseballCardDetails> listScenario = FragmentScenario.launchInContainer(
            BaseballCardDetails.class,
            null,
            R.style.AppTheme
        );
        listScenario.onFragment(fragment -> {
            navController.setGraph(R.navigation.nav_graph);
            Navigation.setViewNavController(fragment.requireView(), navController);
        });
        assertThat(Objects.requireNonNull(navController.getCurrentDestination()).getId())
            .isEqualTo(R.id.card_details);
        BaseballCard card = new BaseballCard(
            true,
            "Mint",
            "Code Guru Apps",
            1993,
            "1",
            50000,
            1,
            "Code Guru",
            "Code Guru Devs",
            "Catcher"
        );
        BBCTTestUtil.sendKeysToCardDetails(card);
        Espresso.onView(ViewMatchers.withId(R.id.save_button)).perform(ViewActions.click());
        assertThat(Objects.requireNonNull(navController.getCurrentDestination()).getId())
            .isEqualTo(R.id.card_list);
    }
}

这失败于

        assertThat(Objects.requireNonNull(navController.getCurrentDestination()).getId())
            .isEqualTo(R.id.card_details);

because theTestNavHostControlleris on thestartDestinationofcard_list.

实际的失败消息是

预期：2131296377

但是：2131296378

在 bbct.android.common.navigation.NavigationTest.clickOnSaveNavigatesFromDetailsBackToList (NavigationTest.java:116)

2131296377is the id forcard_list 2131296378is the id forcard_details

第 116 行是前面提到的assertThat()

我应该通过首先执行用户通常会执行的 UI 操作来导航到card_details来编写这样的测试吗？

依赖关系:

如果它很重要，我有以下导航依赖版本：

    navVersion = '2.4.2'
    implementation "androidx.navigation:navigation-fragment:$navVersion"
    implementation "androidx.navigation:navigation-ui:$navVersion"

1

Answer 1

根据Testing Navigation guide：

就像真正的NavController一样，您必须调用setGraph来初始化TestNavHostController。在这个例子中，正在测试的片段是我们的图的开始目标。TestNavHostController提供了一个setCurrentDestination方法，允许您设置当前目标（以及可选的该目标的参数），以便0

所以添加一个调用setCurrentDestination来初始化你的测试在一个特定的目的地：

listScenario.onFragment(fragment -> {
    navController.setGraph(R.navigation.nav_graph);
    // Create arguments using Safe Args generated classes
    // or construct the Bundle directly
    BaseballCardDetailsArgs args = new BaseballCardDetailsArgs.Builder(0).build();
    Bundle arguments = args.toBundle();
    // Then set the current destination to your card_details
    navController.setCurrentDestination(R.id.card_details, arguments);
    Navigation.setViewNavController(fragment.requireView(), navController);
});

从任意位置开始测试 Android导航

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从任意位置开始测试 Android导航

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