luni/src/test/java/libcore/java/lang/ThrowableTest.java - platform/libcore - Git at Google

 /*
  * Copyright (C) 2010 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 libcore.java.lang;

 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.Arrays;
 import junit.framework.TestCase;
 import libcore.util.SerializationTester;

 public class ThrowableTest extends TestCase {
     private static class NoStackTraceException extends Exception {
         @Override
         public synchronized Throwable fillInStackTrace() {
             return null;
         }
     }
     public void testNullStackTrace() {
         try {
             throw new NoStackTraceException();
         } catch (NoStackTraceException ex) {
             // We used to throw NullPointerException when printing an exception with no stack trace.
             ex.printStackTrace(new PrintWriter(new StringWriter()));
         }
     }

     public void testNonWritableStackTrace() {
         try {
             // The 4th argument, writableStackTrace, is false...
             throw new SuppressionsThrowable("hi", null, true, false);
         } catch (Throwable th) {
             assertEquals("hi", th.getMessage());

             // We see an empty stack trace.
             assertEquals(0, th.getStackTrace().length);

             // setStackTrace is a no-op.
             th.setStackTrace(new StackTraceElement[] { new StackTraceElement("c", "m", "f", -2) });
             assertEquals(0, th.getStackTrace().length);

             // fillInStackTrace is a no-op.
             th.fillInStackTrace();
             assertEquals(0, th.getStackTrace().length);

             // It's still possible to print an exception with writableStackTrace == false.
             th.printStackTrace(new PrintWriter(new StringWriter()));
         }
     }

     private static class SuppressionsThrowable extends Throwable {
         private static final long serialVersionUID = 202649043897209143L;

         public SuppressionsThrowable(String detailMessage, Throwable throwable,
                 boolean enableSuppression, boolean writableStackTrace) {
             super(detailMessage, throwable, enableSuppression, writableStackTrace);
         }
     }

     public void testAddSuppressed() {
         Throwable throwable = new Throwable();
         assertSuppressed(throwable);
         Throwable suppressedA = new Throwable();
         throwable.addSuppressed(suppressedA);
         assertSuppressed(throwable, suppressedA);
         Throwable suppressedB = new Throwable();
         throwable.addSuppressed(suppressedB);
         assertSuppressed(throwable, suppressedA, suppressedB);
     }

     public void testAddDuplicateSuppressed() {
         Throwable throwable = new Throwable();
         Throwable suppressedA = new Throwable();
         throwable.addSuppressed(suppressedA);
         throwable.addSuppressed(suppressedA);
         throwable.addSuppressed(suppressedA);
         assertSuppressed(throwable, suppressedA, suppressedA, suppressedA);
     }

     public void testGetSuppressedReturnsCopy() {
         Throwable throwable = new Throwable();
         Throwable suppressedA = new Throwable();
         Throwable suppressedB = new Throwable();
         throwable.addSuppressed(suppressedA);
         throwable.addSuppressed(suppressedB);
         Throwable[] mutable = throwable.getSuppressed();
         mutable[0] = null;
         mutable[1] = null;
         assertSuppressed(throwable, suppressedA, suppressedB);
     }

     public void testAddSuppressedWithSuppressionDisabled() {
         Throwable throwable = new SuppressionsThrowable("foo", null, false, true);
         assertSuppressed(throwable);
         throwable.addSuppressed(new Throwable());
         assertSuppressed(throwable);
         throwable.addSuppressed(new Throwable());
         assertSuppressed(throwable);
     }

     public void testAddSuppressedSelf() {
         Throwable throwable = new Throwable();
         try {
             throwable.addSuppressed(throwable);
             fail();
         } catch (IllegalArgumentException expected) {
         }
     }

     public void testAddSuppressedNull() {
         Throwable throwable = new Throwable();
         try {
             throwable.addSuppressed(null);
             fail();
         } catch (NullPointerException expected) {
         }
     }

     public void testPrintStackTraceWithCause() {
         Throwable throwable = newThrowable("Throwable", "A", "B");
         throwable.initCause(newThrowable("Cause", "A", "B", "C", "D"));

         assertEquals("java.lang.Throwable: Throwable\n"
                 + "\tat ClassB.doB(ClassB.java:1)\n"
                 + "\tat ClassA.doA(ClassA.java:0)\n"
                 + "Caused by: java.lang.Throwable: Cause\n"
                 + "\tat ClassD.doD(ClassD.java:3)\n"
                 + "\tat ClassC.doC(ClassC.java:2)\n"
                 + "\t... 2 more\n", printStackTraceToString(throwable));
     }

     public void testPrintStackTraceWithCauseAndSuppressed() {
         Throwable throwable = newThrowable("Throwable", "A", "B");
         throwable.initCause(newThrowable("Cause", "A", "B", "C", "D"));
         throwable.addSuppressed(newThrowable("Suppressed", "A", "B", "E", "F"));
         throwable.addSuppressed(newThrowable("Suppressed", "A", "B", "G", "H"));

         assertEquals("java.lang.Throwable: Throwable\n"
                 + "\tat ClassB.doB(ClassB.java:1)\n"
                 + "\tat ClassA.doA(ClassA.java:0)\n"
                 + "\tSuppressed: java.lang.Throwable: Suppressed\n"
                 + "\t\tat ClassF.doF(ClassF.java:3)\n"
                 + "\t\tat ClassE.doE(ClassE.java:2)\n"
                 + "\t\t... 2 more\n"
                 + "\tSuppressed: java.lang.Throwable: Suppressed\n"
                 + "\t\tat ClassH.doH(ClassH.java:3)\n"
                 + "\t\tat ClassG.doG(ClassG.java:2)\n"
                 + "\t\t... 2 more\n"
                 + "Caused by: java.lang.Throwable: Cause\n"
                 + "\tat ClassD.doD(ClassD.java:3)\n"
                 + "\tat ClassC.doC(ClassC.java:2)\n"
                 + "\t... 2 more\n", printStackTraceToString(throwable));
     }

     public void testPrintStackTraceWithEverything() {
         Throwable throwable = newThrowable("Throwable", "A", "B");
         Throwable cause = newThrowable("Cause", "A", "B", "C", "D");
         Throwable suppressed = newThrowable("Suppressed", "A", "B", "E", "F");

         throwable.addSuppressed(suppressed);
         suppressed.addSuppressed(newThrowable("Suppressed/Suppressed", "A", "B", "E", "G"));
         suppressed.initCause(newThrowable("Suppressed/Cause", "A", "B", "E", "H"));

         throwable.initCause(cause);
         cause.addSuppressed(newThrowable("Cause/Suppressed", "A", "B", "C", "I"));
         cause.initCause(newThrowable("Cause/Cause", "A", "B", "C", "J"));

         assertEquals("java.lang.Throwable: Throwable\n"
                 + "\tat ClassB.doB(ClassB.java:1)\n"
                 + "\tat ClassA.doA(ClassA.java:0)\n"
                 + "\tSuppressed: java.lang.Throwable: Suppressed\n"
                 + "\t\tat ClassF.doF(ClassF.java:3)\n"
                 + "\t\tat ClassE.doE(ClassE.java:2)\n"
                 + "\t\t... 2 more\n"
                 + "\t\tSuppressed: java.lang.Throwable: Suppressed/Suppressed\n"
                 + "\t\t\tat ClassG.doG(ClassG.java:3)\n"
                 + "\t\t\t... 3 more\n"
                 + "\tCaused by: java.lang.Throwable: Suppressed/Cause\n"
                 + "\t\tat ClassH.doH(ClassH.java:3)\n"
                 + "\t\t... 3 more\n"
                 + "Caused by: java.lang.Throwable: Cause\n"
                 + "\tat ClassD.doD(ClassD.java:3)\n"
                 + "\tat ClassC.doC(ClassC.java:2)\n"
                 + "\t... 2 more\n"
                 + "\tSuppressed: java.lang.Throwable: Cause/Suppressed\n"
                 + "\t\tat ClassI.doI(ClassI.java:3)\n"
                 + "\t\t... 3 more\n"
                 + "Caused by: java.lang.Throwable: Cause/Cause\n"
                 + "\tat ClassJ.doJ(ClassJ.java:3)\n"
                 + "\t... 3 more\n", printStackTraceToString(throwable));
     }

     public void testSetStackTraceWithNullElement() {
         Throwable throwable = new Throwable();
         try {
             throwable.setStackTrace(new StackTraceElement[]{ null });
             fail();
         } catch (NullPointerException expected) {
         }
     }

     public void testCauseSerialization() {
         String s = "aced0005737200136a6176612e6c616e672e5468726f7761626c65d5c635273977b8cb0300034c0"
                 + "00563617573657400154c6a6176612f6c616e672f5468726f7761626c653b4c000d64657461696c4"
                 + "d6573736167657400124c6a6176612f6c616e672f537472696e673b5b000a737461636b547261636"
                 + "574001e5b4c6a6176612f6c616e672f537461636b5472616365456c656d656e743b78707371007e0"
                 + "00071007e000574000543617573657572001e5b4c6a6176612e6c616e672e537461636b547261636"
                 + "5456c656d656e743b02462a3c3cfd22390200007870000000047372001b6a6176612e6c616e672e5"
                 + "37461636b5472616365456c656d656e746109c59a2636dd8502000449000a6c696e654e756d62657"
                 + "24c000e6465636c6172696e67436c61737371007e00024c000866696c654e616d6571007e00024c0"
                 + "00a6d6574686f644e616d6571007e0002787000000003740006436c6173734474000b436c6173734"
                 + "42e6a617661740003646f447371007e000900000002740006436c6173734374000b436c617373432"
                 + "e6a617661740003646f437371007e000900000001740006436c6173734274000b436c617373422e6"
                 + "a617661740003646f427371007e000900000000740006436c6173734174000b436c617373412e6a6"
                 + "17661740003646f41787400095468726f7761626c657571007e0007000000027371007e000900000"
                 + "001740006436c6173734274000b436c617373422e6a617661740003646f427371007e00090000000"
                 + "0740006436c6173734174000b436c617373412e6a617661740003646f4178";
         Throwable throwable = newThrowable("Throwable", "A", "B");
         throwable.initCause(newThrowable("Cause", "A", "B", "C", "D"));
         assertSerialized(throwable, s);
     }

     public void testSuppressedSerialization() {
         String s = "aced0005737200136a6176612e6c616e672e5468726f7761626c65d5c635273977b8cb0300044c0"
                 + "00563617573657400154c6a6176612f6c616e672f5468726f7761626c653b4c000d64657461696c4"
                 + "d6573736167657400124c6a6176612f6c616e672f537472696e673b5b000a737461636b547261636"
                 + "574001e5b4c6a6176612f6c616e672f537461636b5472616365456c656d656e743b4c00147375707"
                 + "0726573736564457863657074696f6e737400104c6a6176612f7574696c2f4c6973743b787071007"
                 + "e000574000a53657269616c697a65647572001e5b4c6a6176612e6c616e672e537461636b5472616"
                 + "365456c656d656e743b02462a3c3cfd22390200007870000000027372001b6a6176612e6c616e672"
                 + "e537461636b5472616365456c656d656e746109c59a2636dd8502000449000a6c696e654e756d626"
                 + "5724c000e6465636c6172696e67436c61737371007e00024c000866696c654e616d6571007e00024"
                 + "c000a6d6574686f644e616d6571007e0002787000000001740006436c6173734274000b436c61737"
                 + "3422e6a617661740003646f427371007e000900000000740006436c6173734174000b436c6173734"
                 + "12e6a617661740003646f41737200136a6176612e7574696c2e41727261794c6973747881d21d99c"
                 + "7619d03000149000473697a657870000000017704000000017371007e000071007e001474000a537"
                 + "570707265737365647571007e0007000000047371007e000900000003740006436c6173734474000"
                 + "b436c617373442e6a617661740003646f447371007e000900000002740006436c6173734374000b4"
                 + "36c617373432e6a617661740003646f437371007e000900000001740006436c6173734274000b436"
                 + "c617373422e6a617661740003646f427371007e000900000000740006436c6173734174000b436c6"
                 + "17373412e6a617661740003646f41737200266a6176612e7574696c2e436f6c6c656374696f6e732"
                 + "4556e6d6f6469666961626c654c697374fc0f2531b5ec8e100200014c00046c69737471007e00047"
                 + "872002c6a6176612e7574696c2e436f6c6c656374696f6e7324556e6d6f6469666961626c65436f6"
                 + "c6c656374696f6e19420080cb5ef71e0200014c0001637400164c6a6176612f7574696c2f436f6c6"
                 + "c656374696f6e3b78707371007e0012000000007704000000007871007e002b787878";
         Throwable throwable = newThrowable("Serialized", "A", "B");
         throwable.addSuppressed(newThrowable("Suppressed", "A", "B", "C", "D"));
         assertSerialized(throwable, s);
     }

     public void testDisableSuppressionSerialization() {
         String s = "aced0005737200356c6962636f72652e6a6176612e6c616e672e5468726f7761626c65546573742"
                 + "45375707072657373696f6e735468726f7761626c6502cff43b5390d137020000787200136a61766"
                 + "12e6c616e672e5468726f7761626c65d5c635273977b8cb0300044c000563617573657400154c6a6"
                 + "176612f6c616e672f5468726f7761626c653b4c000d64657461696c4d6573736167657400124c6a6"
                 + "176612f6c616e672f537472696e673b5b000a737461636b547261636574001e5b4c6a6176612f6c6"
                 + "16e672f537461636b5472616365456c656d656e743b4c00147375707072657373656445786365707"
                 + "4696f6e737400104c6a6176612f7574696c2f4c6973743b787070740003666f6f7572001e5b4c6a6"
                 + "176612e6c616e672e537461636b5472616365456c656d656e743b02462a3c3cfd223902000078700"
                 + "00000007078";
         Throwable throwable = new SuppressionsThrowable("foo", null, false, true);
         throwable.setStackTrace(new StackTraceElement[0]);
         new SerializationTester<Throwable>(throwable, s) {
             @Override protected boolean equals(Throwable a, Throwable b) {
                 return printStackTraceToString(a).equals(printStackTraceToString(b));
             }
             @Override protected void verify(Throwable deserialized) {
                 // the suppressed exception is silently discarded
                 deserialized.addSuppressed(newThrowable("Suppressed"));
                 assertSuppressed(deserialized);
             }
         }.test();
     }

     public void testEnableSuppressionSerialization() {
         String s = "aced0005737200356c6962636f72652e6a6176612e6c616e672e5468726f7761626c65546573742"
                 + "45375707072657373696f6e735468726f7761626c6502cff43b5390d137020000787200136a61766"
                 + "12e6c616e672e5468726f7761626c65d5c635273977b8cb0300044c000563617573657400154c6a6"
                 + "176612f6c616e672f5468726f7761626c653b4c000d64657461696c4d6573736167657400124c6a6"
                 + "176612f6c616e672f537472696e673b5b000a737461636b547261636574001e5b4c6a6176612f6c6"
                 + "16e672f537461636b5472616365456c656d656e743b4c00147375707072657373656445786365707"
                 + "4696f6e737400104c6a6176612f7574696c2f4c6973743b787070740003666f6f7572001e5b4c6a6"
                 + "176612e6c616e672e537461636b5472616365456c656d656e743b02462a3c3cfd223902000078700"
                 + "0000000737200266a6176612e7574696c2e436f6c6c656374696f6e7324556e6d6f6469666961626"
                 + "c654c697374fc0f2531b5ec8e100200014c00046c69737471007e00057872002c6a6176612e75746"
                 + "96c2e436f6c6c656374696f6e7324556e6d6f6469666961626c65436f6c6c656374696f6e1942008"
                 + "0cb5ef71e0200014c0001637400164c6a6176612f7574696c2f436f6c6c656374696f6e3b7870737"
                 + "200136a6176612e7574696c2e41727261794c6973747881d21d99c7619d03000149000473697a657"
                 + "870000000007704000000007871007e000f78";
         Throwable throwable = new SuppressionsThrowable("foo", null, true, true);
         throwable.setStackTrace(new StackTraceElement[0]);
         new SerializationTester<Throwable>(throwable, s) {
             @Override protected boolean equals(Throwable a, Throwable b) {
                 return printStackTraceToString(a).equals(printStackTraceToString(b));
             }
             @Override protected void verify(Throwable deserialized) {
                 // the suppressed exception is permitted
                 Throwable suppressed = newThrowable("Suppressed");
                 deserialized.addSuppressed(suppressed);
                 assertSuppressed(deserialized, suppressed);
             }
         }.test();
     }

     private void assertSerialized(final Throwable throwable, String golden) {
         new SerializationTester<Throwable>(throwable, golden) {
             @Override protected boolean equals(Throwable a, Throwable b) {
                 return printStackTraceToString(a).equals(printStackTraceToString(b));
             }
         }.test();
     }

     private Throwable newThrowable(String message, String... stackTraceElements) {
         StackTraceElement[] array = new StackTraceElement[stackTraceElements.length];
         for (int i = 0; i < stackTraceElements.length; i++) {
             String s = stackTraceElements[i];
             array[stackTraceElements.length - 1 - i]
                     = new StackTraceElement("Class" + s, "do" + s, "Class" + s + ".java", i);
         }
         Throwable result = new Throwable(message);
         result.setStackTrace(array);
         return result;
     }

     private String printStackTraceToString(Throwable throwable) {
         StringWriter writer = new StringWriter();
         throwable.printStackTrace(new PrintWriter(writer));
         return writer.toString();
     }

     private void assertSuppressed(Throwable throwable, Throwable... expectedSuppressed) {
         assertEquals(Arrays.asList(throwable.getSuppressed()), Arrays.asList(expectedSuppressed));
     }
 }
	/*
	* Copyright (C) 2010 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 libcore.java.lang;

	import java.io.PrintWriter;
	import java.io.StringWriter;
	import java.util.Arrays;
	import junit.framework.TestCase;
	import libcore.util.SerializationTester;

	public class ThrowableTest extends TestCase {
	private static class NoStackTraceException extends Exception {
	@Override
	public synchronized Throwable fillInStackTrace() {
	return null;
	}
	}
	public void testNullStackTrace() {
	try {
	throw new NoStackTraceException();
	} catch (NoStackTraceException ex) {
	// We used to throw NullPointerException when printing an exception with no stack trace.
	ex.printStackTrace(new PrintWriter(new StringWriter()));
	}
	}

	public void testNonWritableStackTrace() {
	try {
	// The 4th argument, writableStackTrace, is false...
	throw new SuppressionsThrowable("hi", null, true, false);
	} catch (Throwable th) {
	assertEquals("hi", th.getMessage());

	// We see an empty stack trace.
	assertEquals(0, th.getStackTrace().length);

	// setStackTrace is a no-op.
	th.setStackTrace(new StackTraceElement[] { new StackTraceElement("c", "m", "f", -2) });
	assertEquals(0, th.getStackTrace().length);

	// fillInStackTrace is a no-op.
	th.fillInStackTrace();
	assertEquals(0, th.getStackTrace().length);

	// It's still possible to print an exception with writableStackTrace == false.
	th.printStackTrace(new PrintWriter(new StringWriter()));
	}
	}

	private static class SuppressionsThrowable extends Throwable {
	private static final long serialVersionUID = 202649043897209143L;

	public SuppressionsThrowable(String detailMessage, Throwable throwable,
	boolean enableSuppression, boolean writableStackTrace) {
	super(detailMessage, throwable, enableSuppression, writableStackTrace);
	}
	}

	public void testAddSuppressed() {
	Throwable throwable = new Throwable();
	assertSuppressed(throwable);
	Throwable suppressedA = new Throwable();
	throwable.addSuppressed(suppressedA);
	assertSuppressed(throwable, suppressedA);
	Throwable suppressedB = new Throwable();
	throwable.addSuppressed(suppressedB);
	assertSuppressed(throwable, suppressedA, suppressedB);
	}

	public void testAddDuplicateSuppressed() {
	Throwable throwable = new Throwable();
	Throwable suppressedA = new Throwable();
	throwable.addSuppressed(suppressedA);
	throwable.addSuppressed(suppressedA);
	throwable.addSuppressed(suppressedA);
	assertSuppressed(throwable, suppressedA, suppressedA, suppressedA);
	}

	public void testGetSuppressedReturnsCopy() {
	Throwable throwable = new Throwable();
	Throwable suppressedA = new Throwable();
	Throwable suppressedB = new Throwable();
	throwable.addSuppressed(suppressedA);
	throwable.addSuppressed(suppressedB);
	Throwable[] mutable = throwable.getSuppressed();
	mutable[0] = null;
	mutable[1] = null;
	assertSuppressed(throwable, suppressedA, suppressedB);
	}

	public void testAddSuppressedWithSuppressionDisabled() {
	Throwable throwable = new SuppressionsThrowable("foo", null, false, true);
	assertSuppressed(throwable);
	throwable.addSuppressed(new Throwable());
	assertSuppressed(throwable);
	throwable.addSuppressed(new Throwable());
	assertSuppressed(throwable);
	}

	public void testAddSuppressedSelf() {
	Throwable throwable = new Throwable();
	try {
	throwable.addSuppressed(throwable);
	fail();
	} catch (IllegalArgumentException expected) {
	}
	}

	public void testAddSuppressedNull() {
	Throwable throwable = new Throwable();
	try {
	throwable.addSuppressed(null);
	fail();
	} catch (NullPointerException expected) {
	}
	}

	public void testPrintStackTraceWithCause() {
	Throwable throwable = newThrowable("Throwable", "A", "B");
	throwable.initCause(newThrowable("Cause", "A", "B", "C", "D"));

	assertEquals("java.lang.Throwable: Throwable\n"
	+ "\tat ClassB.doB(ClassB.java:1)\n"
	+ "\tat ClassA.doA(ClassA.java:0)\n"
	+ "Caused by: java.lang.Throwable: Cause\n"
	+ "\tat ClassD.doD(ClassD.java:3)\n"
	+ "\tat ClassC.doC(ClassC.java:2)\n"
	+ "\t... 2 more\n", printStackTraceToString(throwable));
	}

	public void testPrintStackTraceWithCauseAndSuppressed() {
	Throwable throwable = newThrowable("Throwable", "A", "B");
	throwable.initCause(newThrowable("Cause", "A", "B", "C", "D"));
	throwable.addSuppressed(newThrowable("Suppressed", "A", "B", "E", "F"));
	throwable.addSuppressed(newThrowable("Suppressed", "A", "B", "G", "H"));

	assertEquals("java.lang.Throwable: Throwable\n"
	+ "\tat ClassB.doB(ClassB.java:1)\n"
	+ "\tat ClassA.doA(ClassA.java:0)\n"
	+ "\tSuppressed: java.lang.Throwable: Suppressed\n"
	+ "\t\tat ClassF.doF(ClassF.java:3)\n"
	+ "\t\tat ClassE.doE(ClassE.java:2)\n"
	+ "\t\t... 2 more\n"
	+ "\tSuppressed: java.lang.Throwable: Suppressed\n"
	+ "\t\tat ClassH.doH(ClassH.java:3)\n"
	+ "\t\tat ClassG.doG(ClassG.java:2)\n"
	+ "\t\t... 2 more\n"
	+ "Caused by: java.lang.Throwable: Cause\n"
	+ "\tat ClassD.doD(ClassD.java:3)\n"
	+ "\tat ClassC.doC(ClassC.java:2)\n"
	+ "\t... 2 more\n", printStackTraceToString(throwable));
	}

	public void testPrintStackTraceWithEverything() {
	Throwable throwable = newThrowable("Throwable", "A", "B");
	Throwable cause = newThrowable("Cause", "A", "B", "C", "D");
	Throwable suppressed = newThrowable("Suppressed", "A", "B", "E", "F");

	throwable.addSuppressed(suppressed);
	suppressed.addSuppressed(newThrowable("Suppressed/Suppressed", "A", "B", "E", "G"));
	suppressed.initCause(newThrowable("Suppressed/Cause", "A", "B", "E", "H"));

	throwable.initCause(cause);
	cause.addSuppressed(newThrowable("Cause/Suppressed", "A", "B", "C", "I"));
	cause.initCause(newThrowable("Cause/Cause", "A", "B", "C", "J"));

	assertEquals("java.lang.Throwable: Throwable\n"
	+ "\tat ClassB.doB(ClassB.java:1)\n"
	+ "\tat ClassA.doA(ClassA.java:0)\n"
	+ "\tSuppressed: java.lang.Throwable: Suppressed\n"
	+ "\t\tat ClassF.doF(ClassF.java:3)\n"
	+ "\t\tat ClassE.doE(ClassE.java:2)\n"
	+ "\t\t... 2 more\n"
	+ "\t\tSuppressed: java.lang.Throwable: Suppressed/Suppressed\n"
	+ "\t\t\tat ClassG.doG(ClassG.java:3)\n"
	+ "\t\t\t... 3 more\n"
	+ "\tCaused by: java.lang.Throwable: Suppressed/Cause\n"
	+ "\t\tat ClassH.doH(ClassH.java:3)\n"
	+ "\t\t... 3 more\n"
	+ "Caused by: java.lang.Throwable: Cause\n"
	+ "\tat ClassD.doD(ClassD.java:3)\n"
	+ "\tat ClassC.doC(ClassC.java:2)\n"
	+ "\t... 2 more\n"
	+ "\tSuppressed: java.lang.Throwable: Cause/Suppressed\n"
	+ "\t\tat ClassI.doI(ClassI.java:3)\n"
	+ "\t\t... 3 more\n"
	+ "Caused by: java.lang.Throwable: Cause/Cause\n"
	+ "\tat ClassJ.doJ(ClassJ.java:3)\n"
	+ "\t... 3 more\n", printStackTraceToString(throwable));
	}

	public void testSetStackTraceWithNullElement() {
	Throwable throwable = new Throwable();
	try {
	throwable.setStackTrace(new StackTraceElement[]{ null });
	fail();
	} catch (NullPointerException expected) {
	}
	}

	public void testCauseSerialization() {
	String s = "aced0005737200136a6176612e6c616e672e5468726f7761626c65d5c635273977b8cb0300034c0"
	+ "00563617573657400154c6a6176612f6c616e672f5468726f7761626c653b4c000d64657461696c4"
	+ "d6573736167657400124c6a6176612f6c616e672f537472696e673b5b000a737461636b547261636"
	+ "574001e5b4c6a6176612f6c616e672f537461636b5472616365456c656d656e743b78707371007e0"
	+ "00071007e000574000543617573657572001e5b4c6a6176612e6c616e672e537461636b547261636"
	+ "5456c656d656e743b02462a3c3cfd22390200007870000000047372001b6a6176612e6c616e672e5"
	+ "37461636b5472616365456c656d656e746109c59a2636dd8502000449000a6c696e654e756d62657"
	+ "24c000e6465636c6172696e67436c61737371007e00024c000866696c654e616d6571007e00024c0"
	+ "00a6d6574686f644e616d6571007e0002787000000003740006436c6173734474000b436c6173734"
	+ "42e6a617661740003646f447371007e000900000002740006436c6173734374000b436c617373432"
	+ "e6a617661740003646f437371007e000900000001740006436c6173734274000b436c617373422e6"
	+ "a617661740003646f427371007e000900000000740006436c6173734174000b436c617373412e6a6"
	+ "17661740003646f41787400095468726f7761626c657571007e0007000000027371007e000900000"
	+ "001740006436c6173734274000b436c617373422e6a617661740003646f427371007e00090000000"
	+ "0740006436c6173734174000b436c617373412e6a617661740003646f4178";
	Throwable throwable = newThrowable("Throwable", "A", "B");
	throwable.initCause(newThrowable("Cause", "A", "B", "C", "D"));
	assertSerialized(throwable, s);
	}

	public void testSuppressedSerialization() {
	String s = "aced0005737200136a6176612e6c616e672e5468726f7761626c65d5c635273977b8cb0300044c0"
	+ "00563617573657400154c6a6176612f6c616e672f5468726f7761626c653b4c000d64657461696c4"
	+ "d6573736167657400124c6a6176612f6c616e672f537472696e673b5b000a737461636b547261636"
	+ "574001e5b4c6a6176612f6c616e672f537461636b5472616365456c656d656e743b4c00147375707"
	+ "0726573736564457863657074696f6e737400104c6a6176612f7574696c2f4c6973743b787071007"
	+ "e000574000a53657269616c697a65647572001e5b4c6a6176612e6c616e672e537461636b5472616"
	+ "365456c656d656e743b02462a3c3cfd22390200007870000000027372001b6a6176612e6c616e672"
	+ "e537461636b5472616365456c656d656e746109c59a2636dd8502000449000a6c696e654e756d626"
	+ "5724c000e6465636c6172696e67436c61737371007e00024c000866696c654e616d6571007e00024"
	+ "c000a6d6574686f644e616d6571007e0002787000000001740006436c6173734274000b436c61737"
	+ "3422e6a617661740003646f427371007e000900000000740006436c6173734174000b436c6173734"
	+ "12e6a617661740003646f41737200136a6176612e7574696c2e41727261794c6973747881d21d99c"
	+ "7619d03000149000473697a657870000000017704000000017371007e000071007e001474000a537"
	+ "570707265737365647571007e0007000000047371007e000900000003740006436c6173734474000"
	+ "b436c617373442e6a617661740003646f447371007e000900000002740006436c6173734374000b4"
	+ "36c617373432e6a617661740003646f437371007e000900000001740006436c6173734274000b436"
	+ "c617373422e6a617661740003646f427371007e000900000000740006436c6173734174000b436c6"
	+ "17373412e6a617661740003646f41737200266a6176612e7574696c2e436f6c6c656374696f6e732"
	+ "4556e6d6f6469666961626c654c697374fc0f2531b5ec8e100200014c00046c69737471007e00047"
	+ "872002c6a6176612e7574696c2e436f6c6c656374696f6e7324556e6d6f6469666961626c65436f6"
	+ "c6c656374696f6e19420080cb5ef71e0200014c0001637400164c6a6176612f7574696c2f436f6c6"
	+ "c656374696f6e3b78707371007e0012000000007704000000007871007e002b787878";
	Throwable throwable = newThrowable("Serialized", "A", "B");
	throwable.addSuppressed(newThrowable("Suppressed", "A", "B", "C", "D"));
	assertSerialized(throwable, s);
	}

	public void testDisableSuppressionSerialization() {
	String s = "aced0005737200356c6962636f72652e6a6176612e6c616e672e5468726f7761626c65546573742"
	+ "45375707072657373696f6e735468726f7761626c6502cff43b5390d137020000787200136a61766"
	+ "12e6c616e672e5468726f7761626c65d5c635273977b8cb0300044c000563617573657400154c6a6"
	+ "176612f6c616e672f5468726f7761626c653b4c000d64657461696c4d6573736167657400124c6a6"
	+ "176612f6c616e672f537472696e673b5b000a737461636b547261636574001e5b4c6a6176612f6c6"
	+ "16e672f537461636b5472616365456c656d656e743b4c00147375707072657373656445786365707"
	+ "4696f6e737400104c6a6176612f7574696c2f4c6973743b787070740003666f6f7572001e5b4c6a6"
	+ "176612e6c616e672e537461636b5472616365456c656d656e743b02462a3c3cfd223902000078700"
	+ "00000007078";
	Throwable throwable = new SuppressionsThrowable("foo", null, false, true);
	throwable.setStackTrace(new StackTraceElement[0]);
	new SerializationTester<Throwable>(throwable, s) {
	@Override protected boolean equals(Throwable a, Throwable b) {
	return printStackTraceToString(a).equals(printStackTraceToString(b));
	}
	@Override protected void verify(Throwable deserialized) {
	// the suppressed exception is silently discarded
	deserialized.addSuppressed(newThrowable("Suppressed"));
	assertSuppressed(deserialized);
	}
	}.test();
	}

	public void testEnableSuppressionSerialization() {
	String s = "aced0005737200356c6962636f72652e6a6176612e6c616e672e5468726f7761626c65546573742"
	+ "45375707072657373696f6e735468726f7761626c6502cff43b5390d137020000787200136a61766"
	+ "12e6c616e672e5468726f7761626c65d5c635273977b8cb0300044c000563617573657400154c6a6"
	+ "176612f6c616e672f5468726f7761626c653b4c000d64657461696c4d6573736167657400124c6a6"
	+ "176612f6c616e672f537472696e673b5b000a737461636b547261636574001e5b4c6a6176612f6c6"
	+ "16e672f537461636b5472616365456c656d656e743b4c00147375707072657373656445786365707"
	+ "4696f6e737400104c6a6176612f7574696c2f4c6973743b787070740003666f6f7572001e5b4c6a6"
	+ "176612e6c616e672e537461636b5472616365456c656d656e743b02462a3c3cfd223902000078700"
	+ "0000000737200266a6176612e7574696c2e436f6c6c656374696f6e7324556e6d6f6469666961626"
	+ "c654c697374fc0f2531b5ec8e100200014c00046c69737471007e00057872002c6a6176612e75746"
	+ "96c2e436f6c6c656374696f6e7324556e6d6f6469666961626c65436f6c6c656374696f6e1942008"
	+ "0cb5ef71e0200014c0001637400164c6a6176612f7574696c2f436f6c6c656374696f6e3b7870737"
	+ "200136a6176612e7574696c2e41727261794c6973747881d21d99c7619d03000149000473697a657"
	+ "870000000007704000000007871007e000f78";
	Throwable throwable = new SuppressionsThrowable("foo", null, true, true);
	throwable.setStackTrace(new StackTraceElement[0]);
	new SerializationTester<Throwable>(throwable, s) {
	@Override protected boolean equals(Throwable a, Throwable b) {
	return printStackTraceToString(a).equals(printStackTraceToString(b));
	}
	@Override protected void verify(Throwable deserialized) {
	// the suppressed exception is permitted
	Throwable suppressed = newThrowable("Suppressed");
	deserialized.addSuppressed(suppressed);
	assertSuppressed(deserialized, suppressed);
	}
	}.test();
	}

	private void assertSerialized(final Throwable throwable, String golden) {
	new SerializationTester<Throwable>(throwable, golden) {
	@Override protected boolean equals(Throwable a, Throwable b) {
	return printStackTraceToString(a).equals(printStackTraceToString(b));
	}
	}.test();
	}

	private Throwable newThrowable(String message, String... stackTraceElements) {
	StackTraceElement[] array = new StackTraceElement[stackTraceElements.length];
	for (int i = 0; i < stackTraceElements.length; i++) {
	String s = stackTraceElements[i];
	array[stackTraceElements.length - 1 - i]
	= new StackTraceElement("Class" + s, "do" + s, "Class" + s + ".java", i);
	}
	Throwable result = new Throwable(message);
	result.setStackTrace(array);
	return result;
	}

	private String printStackTraceToString(Throwable throwable) {
	StringWriter writer = new StringWriter();
	throwable.printStackTrace(new PrintWriter(writer));
	return writer.toString();
	}

	private void assertSuppressed(Throwable throwable, Throwable... expectedSuppressed) {
	assertEquals(Arrays.asList(throwable.getSuppressed()), Arrays.asList(expectedSuppressed));
	}
	}