從任意位置開始測驗Android導航

我有以下導航圖startDestinationas 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>

現在我想寫一個從以下開始的測驗card_details：

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);
    }
}

這失敗了

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

因為在TestNavHostController上startDestination。card_list

實際的失敗訊息是

預計：2131296377

但是是：2131296378

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

• 2131296377是 idcard_list
• 2131296378是 idcard_details
• 116行就是前面提到的assertThat()

如何強制此測驗從正確的目的地開始？或者這不是撰寫這樣一個測驗的正確方法嗎？我是否應該card_details通過執行用戶通常會執行的 UI 操作導航到 first 來撰寫這樣的測驗？

依賴項：

萬一這很重要，我有以下導航依賴版本：

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

uj5u.com熱心網友回復：

根據測驗導航指南：

就像一個真實的NavController，你必須呼叫setGraph來初始化TestNavHostController。在這個例子中，被測驗的片段是我們圖表的起始目的地。TestNavHostController提供一種setCurrentDestination方法，允許您設定當前目標（以及可選的該目標的引數），以便NavController在測驗開始之前處于正確狀態。

因此，添加一個呼叫以setCurrentDestination在特定目標上初始化您的測驗：

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);
});

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