NoMatchingViewExceptionHandler.java
/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.test.espresso.base;
import static androidx.test.internal.util.Checks.checkNotNull;
import static com.google.common.base.Throwables.throwIfUnchecked;
import android.util.Log;
import android.view.View;
import androidx.test.espresso.NoMatchingViewException;
import androidx.test.espresso.base.DefaultFailureHandler.TypedFailureHandler;
import androidx.test.espresso.util.HumanReadables;
import androidx.test.platform.io.PlatformTestStorage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.concurrent.atomic.AtomicInteger;
import org.hamcrest.Matcher;
/** An Espresso failure handler that handles an {@link NoMatchingViewException}. */
class NoMatchingViewExceptionHandler extends TypedFailureHandler<NoMatchingViewException> {
private static final String TAG = NoMatchingViewExceptionHandler.class.getSimpleName();
private final PlatformTestStorage testStorage;
private final AtomicInteger failureCount;
public NoMatchingViewExceptionHandler(
PlatformTestStorage testStorage,
AtomicInteger failureCount,
Class<NoMatchingViewException> expectedType) {
super(expectedType);
this.testStorage = checkNotNull(testStorage);
this.failureCount = failureCount;
}
@Override
public void handleSafely(NoMatchingViewException error, Matcher<View> viewMatcher) {
dumpFullViewHierarchyToFile(error);
error.setStackTrace(Thread.currentThread().getStackTrace());
throwIfUnchecked(error);
throw new RuntimeException(error);
}
private void dumpFullViewHierarchyToFile(NoMatchingViewException error) {
String viewHierarchyMsg =
HumanReadables.getViewHierarchyErrorMessage(error.getRootView(), null, "", null);
String viewHierarchyFile = "view-hierarchy-" + failureCount + ".txt";
try {
addOutputFile(viewHierarchyFile, viewHierarchyMsg);
} catch (IOException e) {
// Log and ignore.
Log.w(TAG, "Failed to save the view hierarchy to file " + viewHierarchyFile, e);
}
}
private void addOutputFile(String filename, String content) throws IOException {
try (OutputStream out = testStorage.openOutputFile(filename)) {
out.write(content.getBytes());
}
}
}