add contains() function to string library. added tests too.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@859 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Util.js

@@ -561,6 +561,16 @@ String.prototype.startsWith = function(sStart){
     return (this.substr(0,sStart.length) == sStart);
 };
 
+/**
+* @param {String} str
+* 
+* @returns Whether or not this string contains with the string passed in.
+* @type Boolean
+*/
+String.prototype.contains = function(str){
+    return (this.indexOf(str) != -1);
+};
+
 /**
 * @returns A trimmed version of the string - all leading and 
 *          trailing spaces removed

tests/test_Util.html

@@ -11,16 +11,22 @@
     }
 
     function test_02_Util_Strings(t) {
-        t.plan(3);
+        t.plan(5);
         
         var str = "  chicken pox  ";
 
+        t.ok(str.contains("chicken"), "contains() function correctly finds an embedded string");
+        t.ok(!str.contains("marsupial"), "contains() function correctly does not finds an random string");
+        
+
         var trimmedStr = str.trim();        
 
         t.eq(trimmedStr, "chicken pox", "String.trim works correctly");
 
         t.eq(trimmedStr.startsWith("chicken"), true, "String.startsWith correctly finds chicken");
         t.eq(trimmedStr.startsWith("dolphin"), false, "String.startsWith correctly does not find turkey");
+
+
     }
 
     function test_03_Util_Array(t) {