Fixes for some new CPString tests.

Foundation/CPString.j

@@ -91,7 +91,7 @@ var CPStringHashes      = new objj_dictionary();
 */
 + (id)stringWithHash:(unsigned)aHash
 {
-    var hashString = String(aHash);
+    var hashString = parseInt(aHash, 10).toString(16);
     return "000000".substring(0, MAX(6-hashString.length, 0)) + hashString;
 }
 
@@ -222,13 +222,16 @@ var CPStringHashes      = new objj_dictionary();
         return substr(0, aLength);
 
     var string = self,
-        substring = aString.substr(anIndex),
+        substring = aString.substring(anIndex),
         difference = aLength - length;
 
-    while ((difference -= substring.length) > 0)
+    while ((difference -= substring.length) >= 0)
         string += substring;
 
-    if (difference) string += substring.substr(difference + substring.length);
+    if (-difference < substring.length) 
+        string += substring.substring(0, -difference);
+
+    return string;
 }
 
 //Dividing Strings

Tests/Foundation/CPStringTest.j

@@ -90,9 +90,9 @@ import <Foundation/CPString.j>
 - (void)testStringByPaddingToLength
 {
     [self assert:"onebcd" 
-	  equals:["one" stringByPaddingToLength:6 
-			withString:"abcdefg"
-	                startingAtIndex:1]];
+	      equals:["one" stringByPaddingToLength:6 
+			                         withString:"abcdefg"
+	                            startingAtIndex:1]];
 }
 
 - (void)testComponentsSeparatedByString
@@ -157,6 +157,27 @@ import <Foundation/CPString.j>
         [self assert:[testStrings[i][0] capitalizedString] equals:testStrings[i][1]];	
 }
 
+- (void)testUppercaseString
+{
+    var str = "This is a test";
+    [self assert:[str uppercaseString] equals:"THIS IS A TEST"];
+}
+
+- (void)testLowercaseString
+{
+    var str = "This Is A TEST";
+    [self assert:"this is a test" equals:[str lowercaseString]];
+}
+
+- (void)testStringWithHash
+{
+    [self assert:"000000" equals:[CPString stringWithHash:0]];
+    [self assert:"000001" equals:[CPString stringWithHash:1]];
+    [self assert:"00000a" equals:[CPString stringWithHash:10]];
+    [self assert:"000010" equals:[CPString stringWithHash:16]];
+    [self assert:"ffffff" equals:[CPString stringWithHash:16777215]];
+}
+
 - (void)testStringByDeletingLastPathComponent
 {
     var testStrings = [