Detect global error handler stack corruption

spec/core/GlobalErrorsSpec.js

@@ -58,7 +58,7 @@ describe('GlobalErrors', function() {
     errors.pushListener(handler1);
     errors.pushListener(handler2);
 
-    errors.popListener();
+    errors.popListener(handler2);
 
     fakeGlobal.onerror('foo');
 
@@ -66,6 +66,23 @@ describe('GlobalErrors', function() {
     expect(handler2).not.toHaveBeenCalled();
   });
 
+  it('throws when no listener is passed to #popListener', function() {
+    var errors = new jasmineUnderTest.GlobalErrors({});
+    expect(function() {
+      errors.popListener();
+    }).toThrowError('popListener expects a listener');
+  });
+
+  it('throws when the argument to #popListener is not the current listener', function() {
+    var errors = new jasmineUnderTest.GlobalErrors({});
+    errors.pushListener(function() {});
+    expect(function() {
+      errors.popListener(function() {});
+    }).toThrowError(
+      'popListener was passed a different listener than the current one'
+    );
+  });
+
   it('uninstalls itself, putting back a previous callback', function() {
     var originalCallback = jasmine.createSpy('error'),
       fakeGlobal = { onerror: originalCallback },

spec/core/integration/EnvSpec.js

@@ -974,7 +974,6 @@ describe("Env integration", function() {
     env.execute(null, function() {
       expect(delayedFunctionForMockClock).toHaveBeenCalled();
       expect(globalSetTimeout).toHaveBeenCalledWith(delayedFunctionForGlobalClock, 100);
-
       done();
     });
   });