FYI: Collections.sort() - new test

FYI: Collections.sort() - new test

[David Gilbert]

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This patch (committed) adds a new test for the Collections.sort() methods:

2006-11-10  David Gilbert  <david.gilbert@object-refinery.com>

    * gnu/testlet/java/util/Collections/sort.java: New file.

Regards,

Dave

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Index: gnu/testlet/java/util/Collections/sort.java
===================================================================
RCS file: gnu/testlet/java/util/Collections/sort.java
diff -N gnu/testlet/java/util/Collections/sort.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ gnu/testlet/java/util/Collections/sort.java	10 Nov 2006 16:56:55 -0000
@@ -0,0 +1,248 @@
+/* sort.java -- some checks for the sort() methods in the Collections class.
+   Copyright (C) 2006 David Gilbert <david.gilbert@object-refinery.com>
+This file is part of Mauve.
+
+Mauve is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+Mauve 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Mauve; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+*/
+
+// Tags: JDK1.2
+
+package gnu.testlet.java.util.Collections;
+
+import gnu.testlet.TestHarness;
+import gnu.testlet.Testlet;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+public class sort implements Testlet {
+
+  public void test(TestHarness harness)
+  {
+    testMethod1(harness);
+    testMethod2(harness);
+  }
+  
+  public void testMethod1(TestHarness harness)
+  {
+    harness.checkPoint("(List)");
+    List list = new ArrayList();
+    
+    // sort an empty list - presumably all that can go wrong is that the code
+    // throws some exception due to a coding error...
+    boolean pass = true;
+    try
+    {
+      Collections.sort(list); 
+    }
+    catch (Exception e)
+    {
+      pass = false;
+    }
+    harness.check(pass);
+    
+    // sort a list containing just one item
+    list = new ArrayList();
+    list.add("A");
+    Collections.sort(list);
+    harness.check(list.size(), 1);
+    harness.check(list.get(0), "A");
+    
+    // sort a list containing two items
+    list = new ArrayList();
+    list.add("B");
+    list.add("A");
+    Collections.sort(list);
+    harness.check(list.size(), 2);
+    harness.check(list.get(0), "A");
+    harness.check(list.get(1), "B");
+    
+    // sort a list containing three items
+    list = new ArrayList();
+    list.add("B");
+    list.add("A");
+    list.add("C");
+    Collections.sort(list);
+    harness.check(list.size(), 3);
+    harness.check(list.get(0), "A");
+    harness.check(list.get(1), "B");
+    harness.check(list.get(2), "C");
+    
+    // sort a list with a null in it
+    pass = false;
+    try
+    {
+      list = new ArrayList();
+      list.add("B");
+      list.add("A");
+      list.add(null);
+      Collections.sort(list);
+    }
+    catch (NullPointerException e)
+    {
+      pass = true;
+    }
+    harness.check(pass);
+    
+    // check that equal items don't change order
+    Object obj1 = new Integer(9500);
+    Object obj2 = new Integer(9600);
+    Object obj3 = new Integer(9500);
+    Object obj4 = new Integer(9600);
+    list = new ArrayList();
+    list.add(obj1);
+    list.add(obj2);
+    list.add(obj3);
+    list.add(obj4);
+    Collections.sort(list);
+    harness.check(list.size(), 4);
+    harness.check(list.get(0), obj1);
+    harness.check(list.get(1), obj3);
+    harness.check(list.get(2), obj2);
+    harness.check(list.get(3), obj4);
+    
+    // try a null argument
+    pass = false;
+    try
+    {
+      Collections.sort(null);
+    }
+    catch (NullPointerException e)
+    {
+      pass = true;
+    }
+    harness.check(pass);
+  }
+  
+  static class MyComparator implements Comparator
+  {
+
+    public int compare(Object obj0, Object obj1) {
+        Comparable c0 = (Comparable) obj0;
+        Comparable c1 = (Comparable) obj1;
+        return -c0.compareTo(c1);
+    }
+      
+  }
+  public void testMethod2(TestHarness harness)
+  {
+    harness.checkPoint("(List, Comparator)");
+    List list = new ArrayList();
+    Comparator comparator = new MyComparator();
+    
+    // sort an empty list - presumably all that can go wrong is that the code
+    // throws some exception due to a coding error...
+    boolean pass = true;
+    try
+    {
+      Collections.sort(list, comparator); 
+    }
+    catch (Exception e)
+    {
+      pass = false;
+    }
+    harness.check(pass);
+    
+    // sort a list containing just one item
+    list = new ArrayList();
+    list.add("A");
+    Collections.sort(list, comparator);
+    harness.check(list.size(), 1);
+    harness.check(list.get(0), "A");
+    
+    // sort a list containing two items
+    list = new ArrayList();
+    list.add("B");
+    list.add("A");
+    Collections.sort(list, comparator);
+    harness.check(list.size(), 2);
+    harness.check(list.get(0), "B");
+    harness.check(list.get(1), "A");
+    
+    // sort a list containing three items
+    list = new ArrayList();
+    list.add("B");
+    list.add("A");
+    list.add("C");
+    Collections.sort(list, comparator);
+    harness.check(list.size(), 3);
+    harness.check(list.get(0), "C");
+    harness.check(list.get(1), "B");
+    harness.check(list.get(2), "A");
+    
+    // sort a list with a null in it
+    pass = false;
+    try
+    {
+      list = new ArrayList();
+      list.add("B");
+      list.add("A");
+      list.add(null);
+      Collections.sort(list, comparator);
+    }
+    catch (NullPointerException e)
+    {
+      pass = true;
+    }
+    harness.check(pass);
+
+    // check that equal items don't change order
+    Object obj1 = new Integer(9500);
+    Object obj2 = new Integer(9600);
+    Object obj3 = new Integer(9500);
+    Object obj4 = new Integer(9600);
+    list = new ArrayList();
+    list.add(obj1);
+    list.add(obj2);
+    list.add(obj3);
+    list.add(obj4);
+    Collections.sort(list, comparator);
+    harness.check(list.size(), 4);
+    harness.check(list.get(0), obj2);
+    harness.check(list.get(1), obj4);
+    harness.check(list.get(2), obj1);
+    harness.check(list.get(3), obj3);
+    
+    // try a null argument 1
+    pass = false;
+    try
+    {
+      Collections.sort(null, comparator);
+    }
+    catch (NullPointerException e)
+    {
+      pass = true;
+    }
+    harness.check(pass);
+
+    // try a null argument 2
+    pass = true;
+    try
+    {
+      Collections.sort(new ArrayList(), null);
+    }
+    catch (NullPointerException e)
+    {
+      pass = false;
+    }
+    harness.check(pass);
+  
+  }
+
+}
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