Introduce jest for testing.

We are already using Mocha as testing framework but for some reasons
such as readability and convenience, we decided to use jest instead of
Mocha.

After this patch, ./bacardi test will run both of Mocha and jest.
Once we write test codes enough in jest, we will deprecate Mocha.

ISSUE=#99,#100
TBR=@hwanseung,@yjaeseok

bootstrap/command/test

@@ -28,6 +28,7 @@ function is_already_formatted() {
 
 if is_already_formatted; then
   mocha --napi-modules examples/calculator.js
+  node --napi-modules $(which jest)
 else
   echo "You should run |bacardi format| command first."
 fi

package.json

@@ -1,17 +1,35 @@
 {
   "devDependencies": {
+    "@types/jest": "^21.1.2",
     "@types/node": "^8.0.24",
     "bindings": "^1.3.0",
+    "jest": "^21.2.1",
+    "mkdirp": "^0.5.1",
     "mocha": "^3.5.0",
     "node-addon-api": "^0.6.3",
     "node-gyp": "^3.6.2",
     "nunjucks": "^3.0.1",
-    "mkdirp": "^0.5.1",
     "snake-case": "^2.1.0",
+    "ts-jest": "^21.1.0",
     "typescript": "^2.4.2",
     "webidl2": "^4.1.0"
   },
   "optionalDependencies": {
     "windows-build-tools": "^1.3.2"
+  },
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "json",
+      "jsx",
+      "ts",
+      "tsx"
+    ],
+    "testMatch": [
+      "**/*.test.(ts|tsx)"
+    ],
+    "transform": {
+      "^.+\\.(ts|tsx)$": "<rootDir>/node_modules/ts-jest/preprocessor.js"
+    }
   }
 }

test/interface_constructor.test.ts

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) 2017 The Bacardi Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as bindings from 'bindings';
+
+const bacardi = bindings('bacardi.node');
+
+test('Constructor basic', async () => {
+  let test_interface: bacardi.TestInterface = new bacardi.TestInterface();
+  expect(true).toBe(test_interface instanceof bacardi.TestInterface);
+});

tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "compileOnSave": true,
+  "compilerOptions": {
+    "baseUrl": ".",
+    "experimentalDecorators": true,
+    "noImplicitAny": true,
+    "noImplicitReturns": true,
+    "preserveConstEnums": true,
+    "sourceMap": true,
+    "target": "es5"
+  }
+}