Added StackTraceSimplifierTest

src/test/java/org/jboss/netty/util/StackTraceSimplifierTest.java

@@ -0,0 +1,133 @@
+/*
+ * JBoss, Home of Professional Open Source
+ *
+ * Copyright 2008, Red Hat Middleware LLC, and individual contributors
+ * by the @author tags. See the COPYRIGHT.txt in the distribution for a
+ * full listing of individual contributors.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.jboss.netty.util;
+
+import static org.easymock.EasyMock.*;
+import static org.easymock.classextension.EasyMock.*;
+import static org.junit.Assert.*;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.DefaultChannelPipeline;
+import org.jboss.netty.channel.SimpleChannelHandler;
+import org.junit.Test;
+
+
+/**
+ * @author The Netty Project (netty-dev@lists.jboss.org)
+ * @author Trustin Lee (tlee@redhat.com)
+ *
+ * @version $Rev$, $Date$
+ *
+ */
+public class StackTraceSimplifierTest {
+
+    @Test
+    public void testBasicSimplification() {
+        Exception e = new Exception();
+        e.setStackTrace(new StackTraceElement[] {
+                new StackTraceElement(ChannelBuffer.class.getName(), "a", null, 1),
+                new StackTraceElement("com.example.Foo", "b", null, 1),
+                new StackTraceElement(SimpleChannelHandler.class.getName(), "c", null, 1),
+                new StackTraceElement(ThreadRenamingRunnable.class.getName(), "d", null, 1),
+        });
+
+        StackTraceSimplifier.simplify(e);
+
+        StackTraceElement[] simplified = e.getStackTrace();
+        assertEquals(2, simplified.length);
+        assertEquals(ChannelBuffer.class.getName(), simplified[0].getClassName());
+        assertEquals("com.example.Foo", simplified[1].getClassName());
+    }
+
+    @Test
+    public void testNestedSimplification() {
+        Exception e1 = new Exception();
+        e1.setStackTrace(new StackTraceElement[] {
+                new StackTraceElement(ChannelBuffer.class.getName(), "a", null, 1),
+                new StackTraceElement("com.example.Foo", "b", null, 1),
+                new StackTraceElement(SimpleChannelHandler.class.getName(), "c", null, 1),
+                new StackTraceElement(DefaultChannelPipeline.class.getName(), "d", null, 1),
+                new StackTraceElement(ThreadRenamingRunnable.class.getName(), "e", null, 1),
+        });
+
+        Exception e2 = new Exception(e1);
+        e2.setStackTrace(new StackTraceElement[] {
+                new StackTraceElement(Channel.class.getName(), "a", null, 1),
+                new StackTraceElement("com.example.Bar", "b", null, 1),
+                new StackTraceElement(SimpleChannelHandler.class.getName(), "c", null, 1),
+                new StackTraceElement(DefaultChannelPipeline.class.getName(), "d", null, 1),
+                new StackTraceElement(ThreadRenamingRunnable.class.getName(), "e", null, 1),
+        });
+
+        StackTraceSimplifier.simplify(e2);
+
+        StackTraceElement[] simplified1 = e1.getStackTrace();
+        assertEquals(2, simplified1.length);
+        assertEquals(ChannelBuffer.class.getName(), simplified1[0].getClassName());
+        assertEquals("com.example.Foo", simplified1[1].getClassName());
+
+        StackTraceElement[] simplified2 = e2.getStackTrace();
+        assertEquals(2, simplified2.length);
+        assertEquals(Channel.class.getName(), simplified2[0].getClassName());
+        assertEquals("com.example.Bar", simplified2[1].getClassName());
+    }
+
+    @Test
+    public void testNettyBugDetection() {
+        Exception e = new Exception();
+        e.setStackTrace(new StackTraceElement[] {
+                new StackTraceElement(DefaultChannelPipeline.class.getName(), "a", null, 1),
+                new StackTraceElement(ChannelBuffer.class.getName(), "a", null, 1),
+                new StackTraceElement("com.example.Foo", "b", null, 1),
+                new StackTraceElement(SimpleChannelHandler.class.getName(), "c", null, 1),
+                new StackTraceElement(ThreadRenamingRunnable.class.getName(), "d", null, 1),
+        });
+
+        StackTraceSimplifier.simplify(e);
+
+        StackTraceElement[] simplified = e.getStackTrace();
+        assertEquals(5, simplified.length);
+    }
+
+    @Test
+    public void testEmptyStackTrace() {
+        Exception e = new Exception();
+        e.setStackTrace(new StackTraceElement[0]);
+
+        StackTraceSimplifier.simplify(e);
+        assertEquals(0, e.getStackTrace().length);
+    }
+
+
+    @Test
+    public void testNullStackTrace() {
+        Exception e = createNiceMock(Exception.class);
+        expect(e.getStackTrace()).andReturn(null).anyTimes();
+        replay(e);
+
+        StackTraceSimplifier.simplify(e);
+        assertNull(e.getStackTrace());
+        verify(e);
+    }
+}