feat: ignore tags when emit is empty object

Author: x244777

src/utils/tags.js

@@ -1,6 +1,6 @@
 import { skipTag } from '../filters';
 
-export const adornStandardTags = (eventField) => (uow) => (!uow[eventField] ? uow : ({
+export const adornStandardTags = (eventField) => (uow) => ((!uow[eventField] || Object.keys(uow[eventField]).length === 0) ? uow : ({
   ...uow,
   [eventField]: {
     ...uow[eventField],

test/unit/utils/tags.test.js

@@ -0,0 +1,67 @@
+import 'mocha';
+import { expect } from 'chai';
+import sinon from 'sinon';
+
+import {
+  adornStandardTags,
+} from '../../../src/utils';
+
+describe('utils/tags.js', () => {
+  afterEach(sinon.restore);
+
+  it('should adorn tags, event field exists', () => {
+    process.env.ACCOUNT_NAME = 'account1';
+    process.env.STAGE = 'dev';
+    process.env.SERVICE = 'service1';
+    process.env.AWS_LAMBDA_FUNCTION_NAME = 'lambda1';
+    const uow = {
+      pipeline: 'thing-pipeline',
+      emit: {
+        type: 'thing-updated',
+        partitionKey: 'thing1',
+        timestamp: 1600144863435,
+        thing: {
+          id: '7588777d-19a0-49d5-856f-a657ed4b5034',
+          timestamp: 1600144863435,
+        },
+      },
+    };
+    const event = adornStandardTags('emit')(uow);
+    delete process.env.ACCOUNT_NAME;
+    delete process.env.STAGE;
+    delete process.env.SERVICE;
+    delete process.env.AWS_LAMBDA_FUNCTION_NAME;
+    expect(event).to.deep.equal({
+      ...uow,
+      emit: {
+        ...uow.emit,
+        tags: {
+          account: 'account1',
+          region: 'us-west-2',
+          stage: 'dev',
+          source: 'service1',
+          functionname: 'lambda1',
+          pipeline: 'thing-pipeline',
+          skip: true,
+        },
+      },
+    });
+  });
+
+  it('should not adorn tags, event field does not exist', () => {
+    const uow = {
+      pipeline: 'thing-pipeline',
+    };
+    const event = adornStandardTags('emit')(uow);
+    expect(event).to.deep.equal(uow);
+  });
+
+  it('should not adorn tags, event field is empty object', () => {
+    const uow = {
+      pipeline: 'thing-pipeline',
+      emit: {},
+    };
+    const event = adornStandardTags('emit')(uow);
+    expect(event).to.deep.equal(uow);
+  });
+});