Add a task of webapp test (#51)

* Add a task of webapp test

* Flesh out tests

* Simplify test case

* Remove unnecessary dependency

* Fix style

* Add dependency

* Add trainling newline

Makefile

@@ -157,7 +157,7 @@ ifneq ($(HAS_SERVER),)
 	$(GO) test -v $(GO_TEST_FLAGS) ./server/...
 endif
 ifneq ($(HAS_WEBAPP),)
-	cd webapp && $(NPM) run fix;
+	cd webapp && $(NPM) run fix && $(NPM) run test;
 endif
 
 ## Creates a coverage report for the server code.

webapp/.babelrc

@@ -0,0 +1,4 @@
+{
+    presets: ['@babel/preset-env', '@babel/preset-react']
+}
+

webapp/package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "build": "webpack --mode=production",
     "lint": "eslint --ignore-pattern node_modules --ignore-pattern dist --ext .js --ext .jsx . --quiet",
-    "fix": "eslint --ignore-pattern node_modules --ignore-pattern dist --ext .js --ext .jsx . --quiet --fix"
+    "fix": "eslint --ignore-pattern node_modules --ignore-pattern dist --ext .js --ext .jsx . --quiet --fix",
+    "test": "jest --forceExit --detectOpenHandles --verbose"
   },
   "author": "",
   "license": "",
@@ -26,6 +27,7 @@
     "eslint-plugin-import": "2.18.0",
     "eslint-plugin-react": "7.14.2",
     "file-loader": "4.0.0",
+    "jest": "^24.8.0",
     "webpack": "4.35.0",
     "webpack-cli": "3.3.5"
   },

webapp/src/manifest.test.js

@@ -0,0 +1,6 @@
+import {id, version} from './manifest';
+
+test('Plugin id and version are defined', () => {
+    expect(id).toBeDefined();
+    expect(version).toBeDefined();
+});