Initial jest stuff. Blocked on Babel 7

package.json

@@ -53,8 +53,7 @@
     "stylelint": "stylelint 'res/css/**/*.scss'",
     "clean": "rimraf lib",
     "prepare": "yarn clean && yarn build && git rev-parse HEAD > git-revision.txt",
-    "test": "karma start --single-run=true --browsers VectorChromeHeadless",
-    "test-multi": "karma start",
+    "test": "jest --testMatch **/*-test.js",
     "e2etests": "./test/end-to-end-tests/run.sh --riot-url http://localhost:8080"
   },
   "dependencies": {
@@ -118,6 +117,7 @@
     "babel-cli": "^6.26.0",
     "babel-core": "^6.26.3",
     "babel-eslint": "^10.0.1",
+    "babel-jest": "^23.6.0",
     "babel-loader": "^7.1.5",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-plugin-transform-builtin-extend": "^1.1.2",
@@ -142,7 +142,7 @@
     "expect": "^24.1.0",
     "file-loader": "^3.0.1",
     "flow-parser": "^0.57.3",
-    "jest-mock": "^23.2.0",
+    "jest": "^23.2.0",
     "karma": "^4.0.1",
     "karma-chrome-launcher": "^2.2.0",
     "karma-cli": "^1.0.1",