Fixed: AppKit unit-tests are not standalone

Previously, every AppKit tests used the same sharedApplication. Due to this implementation, a could not pass because a previous test made failed the current test. For instance, a test could fail because the window of the previous test resigned (just imagine a new window is the key window in the current test), and this resign could raise an error. The error was displayed for the current test thought this test was perfect !

We now instead of using sharedApplication create a new CPApplication per unit-test file in the class method setUp.

Tests/AppKit/CPArrayControllerPerformance.j

@@ -6,6 +6,15 @@ var ELEMENTS = 200,
     REPEATS = 25;
 
 @implementation CPArrayControllerPerformance : OJTestCase
+{
+
+}
+
++ (void)setUp
+{
+    // This will init the global var CPApp which are used internally in the AppKit
+    [[CPApplication alloc] init];
+}
 
 - (CPArrayController)setupWithElements:(int)aCount
 {