New: CPError unit test

Tests/Foundation/CPErrorTest.j

@@ -0,0 +1,24 @@
+@import <Foundation/CPError.j>
+@import <OJUnit/OJTestCase.j>
+
+@implementation CPErrorTest : OJTestCase
+{
+}
+
+- (void)testInstanceInstantiation
+{
+    var err = [[CPError alloc] initWithDomain:CPCappuccinoErrorDomain
+                                         code:-10
+                                     userInfo:nil];
+    [self assertNotNull:err];
+}
+
+- (void)testClassInstantiation
+{
+    var err = [CPError errorWithDomain:CPCappuccinoErrorDomain
+                                  code:-10
+                              userInfo:nil];
+    [self assertNotNull:err];
+}
+
+@end