Test: createComparisons

src/__mocks__/comparer.js

@@ -0,0 +1,3 @@
+const isEqual = () => Promise.resolve(false);
+
+export default isEqual;

src/__mocks__/comparisonDataConstructor.js

@@ -0,0 +1,12 @@
+const comparisonDataConstructor = () =>
+  Promise.resolve([
+    {
+      label: 'test1-large',
+      baseline: 'testBaseline/test1-large.png',
+      latest: 'testLatest/test1-large.png',
+      generatedDiffs: 'testDiff/test1-large.png',
+      tolerance: 0
+    }
+  ]);
+
+export default comparisonDataConstructor;

src/__mocks__/createDiff.js

@@ -0,0 +1,3 @@
+const createDiffimage = () => Promise.resolve();
+
+export default createDiffimage;

src/comparisonActions.js

@@ -34,6 +34,7 @@ const createComparisons = async (fs, config) => {
   for (let i = 0; i < comparisonData.length; i++) {
     const scenario = comparisonData[i];
     const equal = await isEqual(scenario);
+    console.log(equal);
 
     if (equal) {
       reporter.pass(scenario.label);

src/comparisonActions.test.js

@@ -3,12 +3,18 @@
 import {
   createDirectories,
   fetchRemoteComparisonImages,
-  clearDirectory
+  clearDirectory,
+  createComparisons
 } from './comparisonActions';
 import { deleteRemote, fetchRemote } from './remoteActions';
+import createDiffImage from './createDiffs';
 
 jest.mock('fs');
 jest.mock('./remoteActions');
+jest.mock('./reporter');
+jest.mock('./comparisonDataConstructor');
+jest.mock('./comparer');
+jest.mock('./createDiffs');
 
 describe('The comparions actions', () => {
   let mockFs;
@@ -22,6 +28,10 @@ describe('The comparions actions', () => {
     };
   });
 
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
   it('Creates directories checks the directories exist before creating', async () => {
     const config = {
       baseline: './baselineTest',
@@ -88,4 +98,26 @@ describe('The comparions actions', () => {
     await clearDirectory(mockFs, config);
     expect(mockFs.unlinkSync.mock.calls.length).toBe(6);
   });
+
+  it('creates a diff image when comparison fails', async () => {
+    const config = {
+      baseline: './baselineTest',
+      latest: './latestTest',
+      generatedDiffs: './generatedDiffsTest',
+      scenarios: [
+        {
+          viewports: [{ height: 2400, width: 1024, label: 'large' }],
+          label: 'test1'
+        }
+      ]
+    };
+
+    mockFs = {
+      readdirSync: () => ['1', '2', '3', '4', '5', '6'],
+      unlinkSync: jest.fn()
+    };
+
+    await createComparisons(mockFs, config);
+    expect(createDiffImage.mock.calls.length).toBe(1);
+  });
 });