使用 launchFragmentInContainer 片段参数为空

Question

我正在为使用 safeArgs 和 FragmentScenario 的片段编写测试，但是当我使用 fragmentArgs 参数调用 launchFragmentInContainer() 时，出现异常提示参数为空。生产代码没有问题。

我的导航图：

<fragment
        android:id="@+id/fragmentNewListItems"
        android:name="com.hotmail.or_dvir.arislistkt2.vvm.FragmentNewListItems"
        android:label="@string/title_newItems"
        tools:layout="@layout/fragment_new_list_items">

        <argument
            android:name="listId"
            app:argType="string" />
        <argument
            android:name="listName"
            app:argType="string" />
    </fragment>

我的测试：

class TesFragmentNewListItems : BaseAndroidTest() {
    private lateinit var fragScenario: FragmentScenario<FragmentNewListItems>

    private val list1 = UserList("list 1")

    @Before
    fun before() {
        //adding a user list to add items to
        repoUserLists.addLists(list1)
        fragScenario = this.launchFragment(
            //setting arguments here
            bundleOf("listId" to list1.id, "listName" to list1.name)
        )
    }


    inline fun <reified T : Fragment> launchFragment(args: Bundle): FragmentScenario<T> {
        return launchFragmentInContainer<T>(
            themeResId = R.style.AppTheme,
            fragmentArgs = args
        )
    }

当我尝试运行我得到的测试

Caused by: java.lang.IllegalArgumentException: Argument "listId" is marked as non-null but was passed a null value.

完整堆栈跟踪：

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at androidx.test.runner.MonitoringInstrumentation.runOnMainSync(MonitoringInstrumentation.java:441)
at androidx.test.core.app.ActivityScenario.onActivity(ActivityScenario.java:564)
at androidx.fragment.app.testing.FragmentScenario.internalLaunch(FragmentScenario.java:300)
at androidx.fragment.app.testing.FragmentScenario.launchInContainer(FragmentScenario.java:282)
at com.hotmail.or_dvir.arislistkt2.TesFragmentNewListItems.before(TesFragmentNewListItems.kt:79)
at java.lang.reflect.Method.invoke(Native Method)
at org.junit.runners.model.FrameworkMethod.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at androidx.test.internal.runner.junit4.statement.RunBefores.evaluate(RunBefores.java:76)
at androidx.test.internal.runner.junit4.statement.RunAfters.evaluate(RunAfters.java:61)
at org.junit.rules.TestWatcher.evaluate(TestWatcher.java:55)
at org.koin.test.mock.MockProviderRule$apply.evaluate(MockProviderRule.kt:13)
at org.junit.rules.TestWatcher.evaluate(TestWatcher.java:55)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access[=13=]0(ParentRunner.java:58)
at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access[=13=]0(ParentRunner.java:58)
at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at androidx.test.internal.runner.TestExecutor.execute(TestExecutor.java:56)
at androidx.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:392)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:2189)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.navigation.NavArgsLazy.getValue(NavArgsLazy.kt:52)
at androidx.navigation.NavArgsLazy.getValue(NavArgsLazy.kt:34)
at com.hotmail.or_dvir.arislistkt2.vvm.FragmentNewListItems.getFragArgs(Unknown Source:4)
at com.hotmail.or_dvir.arislistkt2.vvm.FragmentNewListItems.onViewCreated(FragmentNewListItems.kt:31)
at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:332)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1199)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1368)
at androidx.fragment.app.FragmentManager.moveFragmentToExpectedState(FragmentManager.java:1446)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1509)
at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:447)
at androidx.fragment.app.FragmentManager.executeOps(FragmentManager.java:2181)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2004)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1959)
at androidx.fragment.app.FragmentManager.execSingleAction(FragmentManager.java:1830)
at androidx.fragment.app.BackStackRecord.commitNow(BackStackRecord.java:297)
at androidx.fragment.app.testing.FragmentScenario.perform(FragmentScenario.java:317)
at androidx.fragment.app.testing.FragmentScenario.perform(FragmentScenario.java:301)
at androidx.test.core.app.ActivityScenario.lambda$onActivity$ActivityScenario(ActivityScenario.java:551)
at androidx.test.core.app.ActivityScenario$$Lambda.run(Unknown Source:4)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:462)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at android.app.Instrumentation$SyncRunnable.run(Instrumentation.java:2207)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: java.lang.IllegalArgumentException: Argument "listId" is marked as non-null but was passed a null value.
at com.hotmail.or_dvir.arislistkt2.vvm.FragmentNewListItemsArgs$Companion.fromBundle(FragmentNewListItemsArgs.kt:28)
at com.hotmail.or_dvir.arislistkt2.vvm.FragmentNewListItemsArgs.fromBundle(Unknown Source:2)
... 30 more

编辑：

List1 的 id 不为 null，因为它是在构造函数中初始化的。

class UserList(
    name: String
) : BaseItem(name) {

    //class body
}

abstract class BaseItem(
    var name: String,
    var id: UUID = UUID.randomUUID()
) {

    //class body
}

Answer 1

从您的 post 看，UserList 和 repoUserLists 类长什么样子不清楚。 id 是如何初始化的？您似乎只将 name 的参数传递给 UserList 构造函数。 repoUserLists 会初始化 id 吗？

我的假设是 id 实际上是 null，如异常消息所述。

您是否对 id 进行了一些仅适用于生产构建而不适用于测试环境的初始化？

要验证这一点，您应该在 before 方法的第

行之后添加一行

repoUserLists.addLists(list1)

验证 list1.id 实际上不是 null。

Answer 2

明白了。我不知何故错过了这个警告：

W/Bundle: Key listId expected String but value was a java.util.UUID.  The default value <null> was returned.

我所要做的就是将此 bundleOf("listId" to list1.id...) 更改为 bundleOf("listId" to list1.id.toString()...)（添加对 toString() 的调用）

不确定为什么 google 选择通过将无效类型转换为 null 而不是抛出“InvalidParameter”异常（或类似异常）来处理它们。

使用 launchFragmentInContainer 片段参数为空

fragment arguments are null using launchFragmentInContainer

android

kotlin

android-fragments

android-safe-args

android-fragmentscenario

编辑：