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Android Espresso onData with doesNotExist

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时光取名叫无心
时光取名叫无心 2021-01-02 22:19

I am trying to verify that a ListView does not contain a particular item. Here\'s the code I\'m using:

onData(allOf(is(instanceOf(Contact.class
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  • 悲哀的现实
    悲哀的现实 (楼主)
    2021-01-02 22:29

    According to Espresso samples you must not use onData(...) to check if view doesn't exists in adapter. Check this out - link. Read "Asserting that a data item is not in an adapter" part. You have to use a matcher together with onView() that finds the AdapterView.

    Based on Espresso samples from link above:

    1. matcher:

      private static Matcher withAdaptedData(final Matcher dataMatcher) {
    return new TypeSafeMatcher() {

        @Override
        public void describeTo(Description description) {
            description.appendText("with class name: ");
            dataMatcher.describeTo(description);
        }

        @Override
        public boolean matchesSafely(View view) {
            if (!(view instanceof AdapterView)) {
                return false;
            }

            @SuppressWarnings("rawtypes")
            Adapter adapter = ((AdapterView) view).getAdapter();
            for (int i = 0; i < adapter.getCount(); i++) {
                if (dataMatcher.matches(adapter.getItem(i))) {
                    return true;
                }
            }
            return false;
        }
    };
}


    2. then onView(...), where R.id.list is the id of your adapter ListView:
      


      @SuppressWarnings("unchecked")
public void testDataItemNotInAdapter(){
    onView(withId(R.id.list))
        .check(matches(not(withAdaptedData(is(withContactItemName("TestName"))))));
}

      3. 



      And one more suggestion - to avoid writing is(withContactItemName(is("TestName")) add below code to your matcher:
      


          public static Matcher withContactItemName(String itemText) {
        checkArgument( itemText != null );
        return withContactItemName(equalTo(itemText));
    }



      then you'll have more readable and clear code is(withContactItemName("TestName")
      
    
      
             
      
                                                        
      
            
            
      
              
                
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