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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.support.v4.testutils;
     18 
     19 import android.view.View;
     20 import android.view.ViewGroup;
     21 
     22 import android.support.test.espresso.NoMatchingViewException;
     23 import android.support.test.espresso.ViewAssertion;
     24 
     25 import junit.framework.AssertionFailedError;
     26 
     27 import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
     28 
     29 public class TestUtilsAssertions {
     30 
     31     /**
     32      * Returns an assertion that asserts that there is specified number of fully displayed
     33      * children.
     34      */
     35     public static ViewAssertion hasDisplayedChildren(final int expectedCount) {
     36         return new ViewAssertion() {
     37             @Override
     38             public void check(final View foundView, NoMatchingViewException noViewException) {
     39                 if (noViewException != null) {
     40                     throw noViewException;
     41                 } else {
     42                     if (!(foundView instanceof ViewGroup)) {
     43                         throw new AssertionFailedError("View " +
     44                                 foundView.getClass().getSimpleName() + " is not a ViewGroup");
     45                     }
     46                     final ViewGroup foundGroup = (ViewGroup) foundView;
     47 
     48                     final int childrenCount = foundGroup.getChildCount();
     49                     int childrenDisplayedCount = 0;
     50                     for (int i = 0; i < childrenCount; i++) {
     51                         if (isDisplayed().matches(foundGroup.getChildAt(i))) {
     52                             childrenDisplayedCount++;
     53                         }
     54                     }
     55 
     56                     if (childrenDisplayedCount != expectedCount) {
     57                         throw new AssertionFailedError("Expected " + expectedCount +
     58                                 " displayed children, but found " + childrenDisplayedCount);
     59                     }
     60                 }
     61             }
     62         };
     63     }
     64 }