chore: add unit tests (#316)

* Add first round of tests

* Add more unit tests

* Add pull request testing workflow and clean all eslint errors

* Move cognitive complexity rule to .eslintrc and make it a warning not an error

* Add coverage to tests

* Add more tests

* Fix broken code

* Fix pull request testing workflow

* Fix tests

* Trigger CI

* Trigger CI

* fix linter

.eslintrc

@@ -1,11 +1,13 @@
 env:
   node: true
   es6: true
+  jest/globals: true
 
-plugins: 
+plugins:
   - sonarjs
+  - jest
 
-extends: 
+extends:
   - plugin:sonarjs/recommended
 
 parserOptions:
@@ -25,6 +27,7 @@ rules:
   consistent-this: [0, self]
   func-style: 0
   max-nested-callbacks: 0
+  camelcase: 0
 
   # Warnings
   no-debugger: 1
@@ -33,7 +36,7 @@ rules:
   no-unused-expressions: 1
   no-native-reassign: 1
   no-fallthrough: 1
-  camelcase: 0
+  sonarjs/cognitive-complexity: 1
 
   # Errors
   eqeqeq: 2

.github/workflows/pull-request-testing.yml

@@ -0,0 +1,22 @@
+name: Pull request testing
+
+on:
+  pull_request
+
+jobs:
+  release:
+    name: 'Run linter and tests'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+      - name: Setup Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: 13
+      - name: Install dependencies
+        run: npm ci
+      - name: Run linter
+        run: npm run lint
+      - name: Run tests
+        run: npm test

.gitignore

@@ -13,3 +13,4 @@ output
 *.ids
 *.orig
 out/
+coverage

jest.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  clearMocks: true,
+};

lib/__mocks__/filtersRegistry.js

@@ -0,0 +1,3 @@
+const filtersRegistry = jest.genMockFromModule('../filtersRegistry');
+
+module.exports = filtersRegistry;

lib/__mocks__/utils.js

@@ -0,0 +1,18 @@
+const utils = jest.genMockFromModule('../utils');
+
+utils.__files = {};
+utils.readFile = jest.fn(async (filePath) => {
+  return utils.__files[filePath];
+});
+
+utils.__isFileSystemPathValue = false;
+utils.isFileSystemPath = jest.fn(() => utils.__isFileSystemPathValue);
+
+utils.__isLocalTemplateValue = false;
+utils.isLocalTemplate = jest.fn(async () => utils.__isLocalTemplateValue);
+
+utils.getLocalTemplateDetails = jest.fn(async () => ({
+  resolvedLink: utils.__getLocalTemplateDetailsResolvedLinkValue || '',
+}));
+
+module.exports = utils;