Don't remove existing unhandled exception and promise rejection handlers in Node

spec/core/GlobalErrorsSpec.js

@@ -142,11 +142,9 @@ describe('GlobalErrors', function() {
 
     errors.install();
     expect(globals.listeners.uncaughtException).toEqual([
+      originalHandler,
       jasmine.any(Function)
     ]);
-    expect(globals.listeners.uncaughtException).not.toEqual([
-      originalHandler()
-    ]);
 
     errors.pushListener(handler);
 
@@ -175,11 +173,9 @@ describe('GlobalErrors', function() {
 
       errors.install();
       expect(globals.listeners.unhandledRejection).toEqual([
+        originalHandler,
         jasmine.any(Function)
       ]);
-      expect(globals.listeners.unhandledRejection).not.toEqual([
-        originalHandler()
-      ]);
 
       errors.pushListener(handler);
 
@@ -257,11 +253,9 @@ describe('GlobalErrors', function() {
         errors.install();
 
         expect(globals.listeners.rejectionHandled).toEqual([
+          originalHandler,
           jasmine.any(Function)
         ]);
-        expect(globals.listeners.rejectionHandled).not.toEqual([
-          originalHandler
-        ]);
 
         errors.uninstall();
         expect(globals.listeners.rejectionHandled).toEqual([originalHandler]);