useless exception messages are removed while mocha ci

Author: Sergii Kovalev

test/removeAlias.test.js

@@ -196,7 +196,7 @@ describe('removeAlias', () => {
 		});
 
 		it('should resolve if no updates are applied', () => {
-			providerRequestStub.returns(BbPromise.reject(new Error('No updates are to be performed.')));
+			providerRequestStub.rejects(new Error('No updates are to be performed.'));
 			monitorStackStub.returns(BbPromise.resolve());
 
 			return expect(awsAlias.aliasApplyStackChanges(slsStack1, [ aliasStack2 ], aliasStack1)).to.be.fulfilled

test/updateAliasStack.test.js

@@ -261,7 +261,7 @@ describe('updateAliasStack', () => {
 
 		it('should resolve in case no updates are performed', () => {
 			providerRequestStub.returns(BbPromise.resolve("done"));
-			monitorStackStub.returns(BbPromise.reject(new Error('No updates are to be performed.')));
+			monitorStackStub.rejects(new Error('No updates are to be performed.'));
 
 			return expect(awsAlias.updateAlias()).to.be.fulfilled
 			.then(() => expect(providerRequestStub).to.have.been.calledOnce);