Add View assertion to make sure Fragment is already displaying its views to...

Add View assertion to make sure Fragment is already displaying its views to avoid capturing blank screenshots

Corona-Warn-App/src/androidTest/java/de/rki/coronawarnapp/ui/onboarding/screenshot/OnboardingFragmentScreenshot.kt

 package de.rki.coronawarnapp.ui.onboarding.screenshot
 
 import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withId
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import de.rki.coronawarnapp.R
 import de.rki.coronawarnapp.ui.onboarding.OnboardingFragment
@@ -44,7 +48,8 @@ class OnboardingFragmentScreenshot : BaseUITest() {
     @Test
     fun capture_screenshot() {
         launchFragmentInContainer<OnboardingFragment>(themeResId = R.style.AppTheme)
-        Thread.sleep(1000)
+        // Check any view to make sure screenshot is not blank
+        onView(withId(R.id.onboarding_button_next)).check(matches(isDisplayed()))
         Screengrab.screenshot(OnboardingFragment::class.simpleName)
     }
 }

Corona-Warn-App/src/androidTest/java/de/rki/coronawarnapp/ui/onboarding/screenshot/OnboardingNotificationsFragmentScreenshot.kt

 package de.rki.coronawarnapp.ui.onboarding.screenshot
 
 import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withId
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import de.rki.coronawarnapp.R
 import de.rki.coronawarnapp.ui.onboarding.OnboardingNotificationsFragment
@@ -44,8 +48,8 @@ class OnboardingNotificationsFragmentScreenshot : BaseUITest() {
     @Test
     fun capture_screenshot() {
         launchFragmentInContainer<OnboardingNotificationsFragment>(themeResId = R.style.AppTheme)
-            .onFragment {
-                Screengrab.screenshot(OnboardingNotificationsFragment::class.simpleName)
-            }
+        // Check any view to make sure screenshot is not blank
+        onView(withId(R.id.onboarding_button_next)).check(matches(isDisplayed()))
+        Screengrab.screenshot(OnboardingNotificationsFragment::class.simpleName)
     }
 }

Corona-Warn-App/src/androidTest/java/de/rki/coronawarnapp/ui/onboarding/screenshot/OnboardingPrivacyFragmentScreenshot.kt

 package de.rki.coronawarnapp.ui.onboarding.screenshot
 
 import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withId
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import de.rki.coronawarnapp.R
 import de.rki.coronawarnapp.ui.onboarding.OnboardingPrivacyFragment
@@ -44,8 +48,8 @@ class OnboardingPrivacyFragmentScreenshot : BaseUITest() {
     @Test
     fun capture_screenshot() {
         launchFragmentInContainer<OnboardingPrivacyFragment>(themeResId = R.style.AppTheme)
-            .onFragment {
-                Screengrab.screenshot(OnboardingPrivacyFragment::class.simpleName)
-            }
+        // Check any view to make sure screenshot is not blank
+        onView(withId(R.id.onboarding_button_next)).check(matches(isDisplayed()))
+        Screengrab.screenshot(OnboardingPrivacyFragment::class.simpleName)
     }
 }

Corona-Warn-App/src/androidTest/java/de/rki/coronawarnapp/ui/onboarding/screenshot/OnboardingTestFragmentScreenshot.kt

 package de.rki.coronawarnapp.ui.onboarding.screenshot
 
 import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withId
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import de.rki.coronawarnapp.R
 import de.rki.coronawarnapp.ui.onboarding.OnboardingTestFragment
@@ -44,6 +48,8 @@ class OnboardingTestFragmentScreenshot : BaseUITest() {
     @Test
     fun capture_screenshot() {
         launchFragmentInContainer<OnboardingTestFragment>(themeResId = R.style.AppTheme)
+        // Check any view to make sure screenshot is not blank
+        onView(withId(R.id.onboarding_button_next)).check(matches(isDisplayed()))
         Screengrab.screenshot(OnboardingTestFragment::class.simpleName)
     }
 }

Corona-Warn-App/src/androidTest/java/de/rki/coronawarnapp/ui/onboarding/screenshot/OnboardingTracingFragmentScreenshot.kt

 package de.rki.coronawarnapp.ui.onboarding.screenshot
 
 import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withId
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import de.rki.coronawarnapp.R
 import de.rki.coronawarnapp.ui.onboarding.OnboardingTracingFragment
@@ -44,8 +48,8 @@ class OnboardingTracingFragmentScreenshot : BaseUITest() {
     @Test
     fun capture_screenshot() {
         launchFragmentInContainer<OnboardingTracingFragment>(themeResId = R.style.AppTheme)
-            .onFragment {
-                Screengrab.screenshot(OnboardingTracingFragment::class.simpleName)
-            }
+        // Check any view to make sure screenshot is not blank
+        onView(withId(R.id.onboarding_button_next)).check(matches(isDisplayed()))
+        Screengrab.screenshot(OnboardingTracingFragment::class.simpleName)
     }
 }