message: test(techdocs-common): cover getStaleFiles helper
diff: @@ -17,6 +17,7 @@ import mockFs from 'mock-fs';
  import * as os from 'os';
  import * as path from 'path';
  import {
  + getStaleFiles,
  getFileTreeRecursively,
  getHeadersForFileExtension,
  lowerCaseEntityTripletInStoragePath,
  @@ -99,3 +100,27 @@ describe('lowerCaseEntityTripletInStoragePath', () => {
  ).toThrowError(error);
  });
  });
  +
  +describe('getStaleFiles', () => {
  + const defaultFiles = [
  + 'default/Component/backstage/index.html',
  + 'default/Component/backstage/techdocs_metadata.json',
  + 'default/Component/backstage/assests/javascripts/bundle.7f4f3c92.min.js',
  + 'default/Component/backstage/assets/stylesheets/main.fe0cca5b.min.css',
  + ];
  +
  + it('should return empty array if there is no stale file', () => {
  + const oldFiles = [...defaultFiles];
  + const newFiles = [...defaultFiles];
  + const staleFiles = getStaleFiles(newFiles, oldFiles);
  + expect(staleFiles).toHaveLength(0);
  + });
  +
  + it('should return all stale files when they exists', () => {
  + const oldFiles = [...defaultFiles, 'stale_file.png'];
  + const newFiles = [...defaultFiles];
  + const staleFiles = getStaleFiles(newFiles, oldFiles);
  + expect(staleFiles).toHaveLength(1);
  + expect(staleFiles).toEqual(expect.arrayContaining(['stale_file.png']));
  + });
  +});
  