Add ApplicationErrorReport tests
Tests that long stack traces and exception messages are
truncated to a reasonable size when a CrashReport is generated.
Bug: 29918978
Change-Id: I4d8202ddca850a72e0853e4064d5690965ff371c
diff --git a/core/tests/coretests/src/android/app/ApplicationErrorReportTest.java b/core/tests/coretests/src/android/app/ApplicationErrorReportTest.java
new file mode 100644
index 0000000..19a390a
--- /dev/null
+++ b/core/tests/coretests/src/android/app/ApplicationErrorReportTest.java
@@ -0,0 +1,85 @@
+/*
+ * 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");
+ }
+ }
+}
