Merge "Add ApplicationErrorReport tests" into nyc-mr1-dev

/*

 * 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");

        }

    }

}