placeholder for empty message. stub publisher

Author: ivankatliarchuk

test/fixtures/sns.event.0.json

@@ -0,0 +1,3 @@
+{
+  "Records": []
+}

test/index.spec.ts

@@ -3,9 +3,13 @@ import { expect } from 'chai';
 import mockedEnv, { RestoreFn } from 'mocked-env';
 import { lambdahandler } from '../src';
 import * as event from './fixtures/sns.event.v1.json';
+import * as sinon from 'sinon';
+
+import * as publisher from '../src/publish';
 
 describe('index: ...', () => {
   let restore: RestoreFn;
+  let slack;
 
   beforeEach(() => {
     restore = mockedEnv(
@@ -14,11 +18,13 @@ describe('index: ...', () => {
         LOG_LEVEL: 'ERROR',
         REGION: 'non-exist-1',
       },
-      {clear: true});
+      { clear: true });
+    slack = sinon.stub(publisher, 'publish');
   });
 
   afterEach(() => {
-    restore({restore: true});
+    restore({ restore: true });
+    slack.restore();
   });
 
   it('index: should return processed records', async () => {
@@ -27,4 +33,10 @@ describe('index: ...', () => {
     let body = JSON.parse(result.body);
     expect(body.records).to.be.equal(expected);
   });
+
+  it('index: should publish single slack message', async () => {
+    const result = await lambdahandler(event);
+    expect(slack.calledOnce).is.eq(true);
+  });
+
 });