[JAVA-293]: added tests

Author: agirbal

src/test/com/mongodb/DBCursorTest.java

@@ -105,9 +105,10 @@ public void testBig(){
         assertEquals( numToInsert , c.find().limit(800).count() );
         assertEquals( 800 , c.find().limit(800).toArray().size() );
 
+        // negative limit works like negative batchsize, for legacy reason
         int x = c.find().limit(-800).toArray().size();
         assertLess( x , 800 );
-        
+
         DBCursor a = c.find();
         assertEquals( numToInsert , a.itcount() );
 
@@ -224,7 +225,50 @@ public void testSpecial(){
             assertTrue( o.get("_id") != null );
 
     }
-    
+
+    @Test
+    public void testLimitAndBatchSize() {
+        DBCollection c = _db.getCollection( "LimitAndBatchSize" );
+        c.drop();
+        
+        for ( int i=0; i<1000; i++ )
+            c.save( new BasicDBObject( "x" , i ) );
+
+        DBObject q = BasicDBObjectBuilder.start().push( "x" ).add( "$lt" , 200 ).get();
+
+        DBCursor cur = c.find( q );
+        assertEquals(0, cur.getCursorId());
+        assertEquals( 200 , cur.itcount() );
+
+        cur = c.find( q ).limit(50);
+        assertEquals(0, cur.getCursorId());
+        assertEquals( 50 , cur.itcount() );
+
+        cur = c.find( q ).batchSize(50);
+        assertEquals(0, cur.getCursorId());
+        assertEquals( 200 , cur.itcount() );
+
+        cur = c.find( q ).batchSize(100).limit(50);
+        assertEquals(0, cur.getCursorId());
+        assertEquals( 50 , cur.itcount() );
+
+        cur = c.find( q ).batchSize(-40);
+        assertEquals(0, cur.getCursorId());
+        assertEquals( 40 , cur.itcount() );
+
+        cur = c.find( q ).limit(-100);
+        assertEquals(0, cur.getCursorId());
+        assertEquals( 100 , cur.itcount() );
+
+        cur = c.find( q ).batchSize(-40).limit(20);
+        assertEquals(0, cur.getCursorId());
+        assertEquals( 20 , cur.itcount() );
+
+        cur = c.find( q ).batchSize(-20).limit(100);
+        assertEquals(0, cur.getCursorId());
+        assertEquals( 20 , cur.itcount() );
+    }
+
     final DB _db;
 
     public static void main( String args[] )