1 /*
2  * Copyright (C) 2016 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 com.android.cts.verifier.usb;
18 
19 import android.support.annotation.NonNull;
20 import android.util.Log;
21 
22 /**
23  * Utilities for the USB CTS verifier tests.
24  */
25 public class Util {
26     private static final String LOG_TAG = Util.class.getSimpleName();
27 
28     /**
29      * Run a {@link Invokable} and expect a {@link Throwable}.
30      *
31      * @param r             The {@link Invokable} to run
32      * @param expectedClass The expected {@link Throwable} type
33      */
runAndAssertException(@onNull Invokable r, @NonNull Class<? extends Throwable> expectedClass)34     public static void runAndAssertException(@NonNull Invokable r,
35             @NonNull Class<? extends Throwable> expectedClass) throws Throwable {
36         try {
37             r.run();
38         } catch (Throwable e) {
39             if (e.getClass().isAssignableFrom(expectedClass)) {
40                 return;
41             } else {
42                 Log.e(LOG_TAG, "Expected: " + expectedClass.getName() + ", got: "
43                         + e.getClass().getName());
44                 throw e;
45             }
46         }
47 
48         throw new AssertionError("No throwable thrown");
49     }
50 
51 
52     /**
53      * A {@link Runnable} that can throw an {@link Throwable}.
54      */
55     public interface Invokable {
56         /**
57          * Run the code that might cause an exception.
58          */
run()59         void run() throws Throwable;
60     }
61 }
62