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 static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
20 
21 import android.support.test.espresso.NoMatchingViewException;
22 import android.support.test.espresso.ViewAssertion;
23 import android.view.View;
24 import android.view.ViewGroup;
25 
26 public class TestUtilsAssertions {
27 
28     /**
29      * Returns an assertion that asserts that there is specified number of fully displayed
30      * children.
31      */
hasDisplayedChildren(final int expectedCount)32     public static ViewAssertion hasDisplayedChildren(final int expectedCount) {
33         return new ViewAssertion() {
34             @Override
35             public void check(final View foundView, NoMatchingViewException noViewException) {
36                 if (noViewException != null) {
37                     throw noViewException;
38                 } else {
39                     if (!(foundView instanceof ViewGroup)) {
40                         throw new AssertionError("View "
41                                 + foundView.getClass().getSimpleName() + " is not a ViewGroup");
42                     }
43                     final ViewGroup foundGroup = (ViewGroup) foundView;
44 
45                     final int childrenCount = foundGroup.getChildCount();
46                     int childrenDisplayedCount = 0;
47                     for (int i = 0; i < childrenCount; i++) {
48                         if (isDisplayed().matches(foundGroup.getChildAt(i))) {
49                             childrenDisplayedCount++;
50                         }
51                     }
52 
53                     if (childrenDisplayedCount != expectedCount) {
54                         throw new AssertionError("Expected " + expectedCount
55                                 + " displayed children, but found " + childrenDisplayedCount);
56                     }
57                 }
58             }
59         };
60     }
61 }