test: migrate from chai and sinon to jest framework for writing tests

Author: softvar

.babelrc

@@ -8,10 +8,7 @@ pids
 *.pid
 *.seed
 
-# Directory for instrumented libs generated by jscoverage/JSCover
-lib-cov
-
-# Coverage directory used by tools like istanbul    
+# Coverage directory used by tools like istanbul
 coverage
 .coveralls.yml
 
@@ -27,3 +24,5 @@ build/Release
 # Dependency directory
 # https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git
 node_modules
+.vscode
+.DS_STORE

.gitignore

@@ -0,0 +1,3 @@
+module.exports = {
+  presets: [['@babel/preset-env', { targets: { node: 'current' } }]],
+};

babel.config.js

@@ -0,0 +1,10 @@
+module.exports = {
+  transform: {
+    '^.+\\.jsx?$': 'babel-jest',
+  },
+  // This is for handling extensions, if needed
+  moduleFileExtensions: ['js', 'jsx', 'json', 'node', 'mjs'],
+  // This might be required if you want to ignore some files
+  transformIgnorePatterns: ['/node_modules/'],
+  testEnvironment: 'jest-environment-jsdom',
+};

jest.config.js

@@ -0,0 +1,69 @@
+import SecureLS from '../src/index';
+
+let lib;
+
+var localStorageMock = (function () {
+  var store = {};
+  return {
+    getItem: function (key) {
+      return store[key];
+    },
+    setItem: function (key, value) {
+      store[key] = value.toString();
+    },
+    clear: function () {
+      store = {};
+    },
+    removeItem: function (key) {
+      delete store[key];
+    },
+  };
+})();
+Object.defineProperty(window, 'localStorage', { value: localStorageMock });
+
+describe('Basic suites', () => {
+  beforeAll(() => {});
+
+  describe('instance creation', () => {
+    lib = new SecureLS();
+
+    test('should check correct instance creation', () => {
+      expect(lib).toBeInstanceOf(SecureLS);
+    });
+
+    test('should return the name', () => {
+      expect(lib._name).toBe('secure-ls');
+    });
+  });
+
+  describe('constructor', () => {
+    lib = new SecureLS();
+
+    test('should be called on instance creation', () => {
+      expect(lib._name).toBeDefined();
+      expect(lib.Base64).toBeDefined();
+      expect(lib.LZString).toBeDefined();
+      expect(lib.AES).toBeDefined();
+      expect(lib.DES).toBeDefined();
+      expect(lib.RABBIT).toBeDefined();
+      expect(lib.RC4).toBeDefined();
+      expect(lib.enc).toBeDefined();
+      expect(lib.storage).toBeDefined();
+      expect(lib.config).toBeDefined();
+      expect(lib.config).toBeInstanceOf(Object);
+      expect(lib.config).toHaveProperty('encodingType');
+      expect(lib.config).toHaveProperty('isCompression');
+    });
+
+    test('should call init method', () => {
+      const spy = jest.spyOn(lib, 'init');
+
+      // mock as if new instance is created but actually not
+      // Can't expect otherwise Object reference would be lost
+      expect(spy).not.toHaveBeenCalled();
+      lib.init();
+      expect(spy).toHaveBeenCalled();
+      spy.mockRestore(); // Reset spy after test
+    });
+  });
+});