Add ApplicationErrorReport tests (a4f9ec94) · Commits · e / os / android_frameworks_base

core/tests/coretests/src/android/app/ApplicationErrorReportTest.java

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		/*
		* Copyright (C) 2016 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 android.app;

		import org.junit.Test;
		import org.junit.runner.RunWith;

		import android.app.ApplicationErrorReport.CrashInfo;
		import android.support.test.filters.SmallTest;
		import android.support.test.runner.AndroidJUnit4;

		import static org.junit.Assert.assertEquals;
		import static org.junit.Assert.assertTrue;

		@RunWith(AndroidJUnit4.class)
		@SmallTest
		public class ApplicationErrorReportTest {

		@Test
		public void testHugeStacktraceLeadsToReasonableReport() {
		Throwable deepStackTrace = deepStackTrace();
		CrashInfo crashInfo = new CrashInfo(deepStackTrace);

		assertTrue("stack trace is longer than 50'000 characters",
		crashInfo.stackTrace.length() < 50000);
		}

		@Test
		public void testHugeExceptionMessageLeadsToReasonableReport() {
		StringBuilder msg = new StringBuilder();
		for (int i = 0; i < 1000000; i++) {
		msg.append('x');
		}

		CrashInfo crashInfo = new CrashInfo(new Throwable(msg.toString()));

		assertTrue("message is longer than 50'000 characters",
		crashInfo.exceptionMessage.length() < 50000);
		}

		@Test
		public void testTruncationKeepsStartAndEndIntact() {
		StringBuilder msg = new StringBuilder("start");
		for (int i = 0; i < 1000000; i++) {
		msg.append('x');
		}
		msg.append("end");

		CrashInfo crashInfo = new CrashInfo(new Throwable(msg.toString()));

		String exceptionMessage = crashInfo.exceptionMessage;
		assertEquals("start", exceptionMessage.substring(0, "start".length()));
		assertEquals("end", exceptionMessage.substring(exceptionMessage.length() - "end".length()));
		}

		/**
		* @return a Throwable with a very long stack trace.
		*/
		private Throwable deepStackTrace() {
		return stackTraceGenerator__aaaaaaaaa_aaaaaaaaa_aaaaaaaaa_aaaaaaaaa_aaaaaaaaa(1000);
		}

		private Throwable stackTraceGenerator__aaaaaaaaa_aaaaaaaaa_aaaaaaaaa_aaaaaaaaa_aaaaaaaaa(
		int d) {
		if (d > 0) {
		return stackTraceGenerator__aaaaaaaaa_aaaaaaaaa_aaaaaaaaa_aaaaaaaaa_aaaaaaaaa(d - 1);
		} else {
		return new Throwable("here");
		}
		}
		}