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2  * Version: CPL 1.0/GPL 2.0/LGPL 2.1
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4  * The contents of this file are subject to the Common Public
5  * License Version 1.0 (the "License"); you may not use this file
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14  * Copyright (C) 2005 David Corbin <dcorbin@users.sf.net>
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28 package org.jruby.test;
29
30 import java.io.ByteArrayOutputStream JavaDoc;
31 import java.io.PrintStream JavaDoc;
32 import java.util.ArrayList JavaDoc;
33 import java.util.List JavaDoc;
34
35 import junit.framework.TestCase;
36
37 import org.jruby.Ruby;
38 import org.jruby.RubyArray;
39 import org.jruby.RubyException;
40 import org.jruby.RubyString;
41
42 public class TestRubyException extends TestCase {
43
44     private Ruby interpreter;
45     private RubyException exception;
46
47     public void setUp() {
48         interpreter = Ruby.getDefaultInstance();
49         exception = new RubyException(interpreter, interpreter.getClass("StandardError"), "test");
50     }
51
52     public void testPrintBacktraceWithHiddenLevels() throws Exception JavaDoc {
53         setBackTrace(19);
54         
55         String JavaDoc[] lines = printError();
56         
57         assertEquals(expectedTraceLine(1), lines[0]);
58         assertEquals("\t ... 7 levels...", lines[RubyException.TRACE_HEAD]);
59         assertEquals(expectedTraceLine(16), lines[RubyException.TRACE_HEAD + 1]);
60     }
61     
62     public void testPrintBacktrace() throws Exception JavaDoc {
63         setBackTrace(18);
64         
65         String JavaDoc[] lines = printError();
66         
67         assertEquals(expectedTraceLine(1), lines[0]);
68         assertEquals(expectedTraceLine(RubyException.TRACE_HEAD + 1), lines[RubyException.TRACE_HEAD]);
69     }
70
71     public void testPrintNilBacktrace() throws Exception JavaDoc {
72         exception.set_backtrace(interpreter.getNil());
73         
74         String JavaDoc[] lines = printError();
75         
76         assertEquals(0, lines.length);
77     }
78
79     private String JavaDoc[] printError() {
80         ByteArrayOutputStream JavaDoc byteArrayOutputStream = new ByteArrayOutputStream JavaDoc(2048);
81         PrintStream JavaDoc stream = new PrintStream JavaDoc(byteArrayOutputStream);
82         exception.printBacktrace(stream);
83         String JavaDoc output = new String JavaDoc(byteArrayOutputStream.toByteArray());
84         if (output.trim().length() == 0) {
85             return new String JavaDoc[0];
86         } else {
87             return output.split("\n");
88         }
89     }
90
91     private void setBackTrace(int lineCount) {
92         List JavaDoc traceLines = new ArrayList JavaDoc();
93         for (int i=0; i<lineCount; i++)
94             traceLines.add(RubyString.newString(interpreter, testLine(i)));
95         exception.set_backtrace(RubyArray.newArray(interpreter, traceLines));
96     }
97     
98     private String JavaDoc expectedTraceLine(int index) {
99         return "\tfrom " + testLine(index);
100     }
101
102     private String JavaDoc testLine(int i) {
103         return "Line " + i;
104     }
105 }
106
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