如何在 Dialog 片段上运行单元测试？

如何解决如何在 Dialog 片段上运行单元测试？

我正在尝试为 DialogFragment 创建一个独立的单元测试，因此可以单独测试 DialogFragment。我正在使用 FragmentScenario 来启动 DialogFragment，现在我正在尝试确认是否显示了 Dialog 消息，但最终我将测试按钮点击。

class ResetScoreDialog (val viewModel: MyViewModel) : DialogFragment() {

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        return activity?.let {
            // Use the Builder class for convenient dialog construction
            val builder = AlertDialog.Builder(it)
            builder.setMessage(getString(R.string.resetscore_dialog_message))
                .setPositiveButton(getString(R.string.confirm),DialogInterface.OnClickListener { dialog,id ->
                        viewModel.resetScore()
                    })

            // Create the AlertDialog object and return it
            builder.create()
        } ?: throw IllegalStateException("Activity cannot be null")

    }
}

我的测试

@RunWith(RobolectricTestRunner::class)
class ResetScoreDialogTest {

    private lateinit var scenario: FragmentScenario<ResetScoreDialog>

    private lateinit var viewModel: MyViewModel

    @Before
    fun setup() {
        viewModel = mock (MyViewModel::class.java)
        scenario = launchFragmentInContainer(
            factory = MainFragmentFactory(viewModel),fragmentArgs = null,themeResId = R.style.Theme_TDDScoreKeeper
        )
    }

    @Test
    fun `Dialog Displayed`() {
        onView(withText(R.string.resetscore_dialog_message))

            .check(matches(isDisplayed()))
    }
}

运行测试时出现以下错误。

androidx.test.espresso.NoMatchingViewException: No views in hierarchy found matching: with string from resource id: <2131755113>

View Hierarchy:
+>DecorView{id=-1,visibility=VISIBLE,width=320,height=470,has-focus=false,has-focusable=false,has-window-focus=true,is-clickable=false,is-enabled=true,is-focused=false,is-focusable=false,is-layout-requested=false,is-selected=false,layout-params={(0,0)(fillxfill) ty=BASE_APPLICATION wanim=0x10302f8
  fl=LAYOUT_IN_SCREEN LAYOUT_INSET_DECOR SPLIT_TOUCH HARDWARE_ACCELERATED DRAWS_SYSTEM_BAR_BACKGROUNDS
  pfl=FORCE_DRAW_STATUS_BAR_BACKGROUND},tag=null,root-is-layout-requested=false,has-input-connection=false,x=0.0,y=0.0,child-count=1} 
|
+->LinearLayout{id=-1,layout-params=android.widget.FrameLayout$LayoutParams@4ed1c9d4,child-count=2} 
|
+-->ViewStub{id=16908682,res-name=action_mode_bar_stub,visibility=GONE,width=0,height=0,is-layout-requested=true,layout-params=android.widget.LinearLayout$LayoutParams@5853ff65,y=0.0} 
|
+-->FrameLayout{id=16908290,res-name=content,layout-params=android.widget.LinearLayout$LayoutParams@188c12d2,child-count=0} 

尝试了不同的解决方案。

        scenario.onFragment {
        onView(withText(R.string.resetscore_dialog_message))
            .check(matches(isDisplayed()))
        }

androidx.test.espresso.NoMatchingViewException：在层次结构中没有找到匹配的视图：来自资源 id 的字符串：

        onView(withText(R.string.resetscore_dialog_message))
            .inRoot(isDialog())
            .check(matches(isDisplayed()))

androidx.test.espresso.NoMatchingRootException：匹配器“是对话框”与以下任何根都不匹配：[Root{application-window-token=android.view.ViewRootImpl$W@b421ae4，window-token=android。 view.ViewRootImpl$W@b421ae4,layout-params-type=1,layout-params-string={(0,0)(fillxfill) ty=BASE_APPLICATION wanim=0x10302f8 fl=LAYOUT_IN_SCREEN LAYOUT_INSET_DECOR SPLIT_TOUCH HARDWARE_ACCELERATED DRAWS_SYSTEM_BAR_BACKGROUNDS

        scenario.onFragment {
        onView(withText(R.string.resetscore_dialog_message))
            .inRoot(isDialog())
            .check(matches(isDisplayed()))
        }

androidx.test.espresso.NoMatchingRootException：匹配器“是对话框”与以下任何根都不匹配：[Root{application-window-token=android.view.ViewRootImpl$W@65799e3f,window-token=android. view.ViewRootImpl$W@65799e3f,0)(fillxfill) ty=BASE_APPLICATION wanim=0x10302f8 fl=LAYOUT_IN_SCREEN LAYOUT_INSET_DECOR SPLIT_TOUCH HARDWARE_ACCELERATED DRAWS_SYSTEM_BAR_BACKGROUNDS

解决方法

测试 launchFragmentInContainer 时不能使用 DialogFragment。

切换到 launchFragment 扩展

在您的测试类中放置一个类似的函数并在每次测试之前调用它：

/**
  * Launch YuorDialogFragment dialogfragment
  */
private fun openDialogFragment(): FragmentScenario<YuorDialogFragment> {
  return launchFragment(
    themeResId = R.style.AppTheme
  ) {
    return@launchFragment YuorDialogFragment(
      ViewModelUtil.createFor(mockViewModel)
    );
  }
}

将对话框测试放在 androidTest 文件夹中