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I'm trying to write some UI tests for an Android APP with the espresso framework.

For now I'm just checking if all the elements are present on the splash screen and then I'm trying to click the login button.

When the the button is clicked the test fails due to an error that I can't seem to understand why it's happening.

My test code is

@RunWith(AndroidJUnit4.class) @SmallTest public class WelcomeTest { @Rule public ActivityTestRule<Welcome> mActivityRule = new ActivityTestRule<>( Welcome.class); @Test public void elements_present() { // Check login onView(withId(R.id.wv_login)).check(matches(isDisplayed())); // Check signup onView(withId(R.id.wv_signup)).check(matches(isDisplayed())); // Check video onView(withId(R.id.videoView)).check(matches(isDisplayed())); // Check swipe right onView(withId(R.id.videoView)).perform(swipeRight()); // Check swipe left onView(withId(R.id.videoView)).perform(swipeLeft()); } @Test public void tap_login() { // Tap login button onView(withId(R.id.wv_login)).perform(click()); } }

The output I get is:

Caused by: java.lang.RuntimeException: Action will not be performed because the target view does not match one or more of the following constraints: at least 90 percent of the view's area is displayed to the user.

What does this mean and is this caused by my test approach or is it a bug on the code? The app seems to work just fine on my devices.

PS: I have disabled the animations as the espresso documentation suggests

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4 Answers 4

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35

Caused by: java.lang.RuntimeException: Action will not be performed because the target view does not match one or more of the following constraints: at least 90 percent of the view's area is displayed to the user.

I happens when any expected View is not full visible, Espresso by default is looking for elements which are completely visible on device screen.

It seems to be that your actual device screen don't show whole content of your login activity xml file.

  • Do you use ScrollView or ListView?
  • How your layout looks like?
  • Is it completely displayed on tested device?

It might help:

onView(withId(R.id.wv_login)) .perform(scrollTo(), click());

I problem still would happen, please you add to your question xml or screenshot. I would fix it ;-)

NOTE: To check if something is completely visible (it means more then 90%) you can use

onView(withId(R.id.wv_login)).check(matches(isCompletelyDisplayed()));

instead of:

onView(withId(R.id.wv_login)).check(matches(isDisplayed()));

Run your test on bigger screen device, to check if it still happens.

If you have question please free to ask

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1 Comment

Thank you this was a saver, I was not understanding why this issue occurs sporadically. scrollTo worked!
6

The RuntimeException seen here java.lang.RuntimeException: Action will not be performed because the target view does not match one or more of the following constraints: at least 90 percent of the view's area is displayed to the user. Does, in fact come from a failure of the View to be fully displayed. However, the answer given by @piotrek1543 doesn't really get to a solution, though it is full of really good inforamation.

The issue is caused by a race condition. You are attempting to open the view, and during it's opening you are attempting to click it. If the timing isn't right, then less than 90% of the View will be available for the Espresso framework to click(). You can resolve the issue by disabling animations, as recommended in The Espresso Setup Instructions

  • Navigate to you phone's Developer Options
  • Set the following
    • Window animation scale = 0.0x
    • Transition animation scale = 0.0x
    • Animator duration scale = 0.0x

My own testing indicates that you can get away with just setting the Transition Animation Scale to 0.0x. As you can imagine, this is a perfectly consistent solution to the race condition that you're experiencing.

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2 Comments

I dont think this is always the case...with animations turned off and a breakpoint to give the screen time to load before the scrollTo(), click() . I still get: Caused by: java.lang.RuntimeException: Scrolling to view was attempted, but the view is not displayed
Dear Oyrm, The Espresso Setup Instructions link isn't working, can you please attach the working one??
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If button is not placed in scrollview and animations turned off, this error can occur when button is set a height and within a parent layout with a height set to wrap_content.

Fail

<LinearLayout ... android:layout_width="match_parent" **android:layout_height="wrap_content">** <com.google.android.material.button.MaterialButton android:id="@+id/btn_attendance" app:backgroundTint="@color/surveyColor" android:textAllCaps="false" android:text="View Attendance" android:layout_weight="1" android:layout_marginRight="5dp" android:layout_width="0dp" **android:layout_height="60dp"/>** </LinearLayout>

Pass : The value of height should rather be passed to the parent layout

 <LinearLayout ... android:layout_width="match_parent" **android:layout_height="60dp">** <com.google.android.material.button.MaterialButton android:id="@+id/btn_attendance" app:backgroundTint="@color/surveyColor" android:textAllCaps="false" android:text="View Attendance" android:layout_weight="1" android:layout_marginRight="5dp" android:layout_width="0dp" **android:layout_height="60dp"/>** </LinearLayout>
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2 Comments

OMG - thanks so much. I was hunting this issue for a day now.
in my case, the parent was clipping the children, because the parent is not large enough to show enough of the child, causing the child to show less than 90%...
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If your View items are contained inside a ScrollView, and the screen's height is not enough to show 90% of the ScrollView, you will get an error like this:

androidx.test.espresso.PerformException: Error performing 'fast swipe' on view 'Animations or transitions are enabled on the target device. For more info check: https://developer.android.com/training/testing/espresso/setup#set-up-environment with id is <com.company.App:id/textview_inside_scrollview>'. ... Caused by: java.lang.RuntimeException: Action will not be performed because the target view does not match one or more of the following constraints: at least 90 percent of the view's area is displayed to the user.

You can workaround this by scrolling the ScrollView first. Use UiDevice.swipe() from the UI Automator library, which is an alternative to Espresso's ViewActions.swipeUp() and swipeDown(), and the benefit is that it will work on a partially-visible ScrollView. But you'll have to use approximate coordinates based on the percentage of the screen height and width.

For example, if you assume your ScrollView is in the center of the screen, then you can swipe up like this:

app/build.gradle:

dependencies { // Use to implement UIAutomator tests androidTestImplementation "androidx.test.uiautomator:uiautomator:2.2.0" }

Kotlin:

val device = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation()) val screenWidth = device.displayWidth val screenHeight = device.displayHeight // Swipe up from the center (50%) to 30% screen height device.swipe( (screenWidth * 0.5).toInt(), (screenHeight * 0.5).toInt(), (screenWidth * 0.5).toInt(), (screenHeight * 0.3).toInt(), 50 )

Java:

UiDevice device = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation()); int screenWidth = device.getDisplayWidth(); int screenHeight = device.getDisplayHeight(); // Swipe up from the center (50%) to 30% screen height device.swipe((int)(screenWidth * 0.5), (int)(screenHeight * 0.5), (int)(screenWidth * 0.5), (int)(screenHeight * 0.3), 50);
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