Set up ts jest

package.json

@@ -2,6 +2,7 @@
   "scripts": {
     "build": "webpack -p",
     "start": "webpack-dev-server",
+    "test": "jest",
     "deploy": "yarn build && gh-pages -d dist"
   },
   "dependencies": {
@@ -12,17 +13,36 @@
     "phaser": "3.10.1"
   },
   "devDependencies": {
+    "@types/jest": "23.1.4",
+    "@types/node": "10.5.2",
+    "babel-core": "^6.26.3",
+    "babel-jest": "^23.2.0",
     "copy-webpack-plugin": "4.5.1",
     "jest": "23.3.0",
     "source-map-loader": "^0.2.3",
+    "ts-jest": "23.0.0",
     "typescript": "^2.9.2",
     "webpack": "4.10.2",
     "webpack-cli": "3.0.2",
     "webpack-dev-server": "3.1.4"
   },
   "jest": {
+    "moduleFileExtensions": [
+      "ts",
+      "tsx",
+      "json",
+      "js"
+    ],
+    "transform": {
+      "^.+\\.(ts|tsx)$": "ts-jest"
+    },
+    "globals": {
+      "ts-jest": {
+        "tsConfigFile": "tsconfig.json"
+      }
+    },
     "testMatch": [
-      "**/tests/**/*.js"
+      "**/tests/**/*.ts"
     ]
   }
 }

src/index.ts

@@ -1,4 +1,5 @@
 /// <reference path="../typings/phaser.d.ts" />
+/// <reference path="../typings/typings.d.ts" />
 
 import 'phaser';
 import Main from './scenes/Main';

tests/map.ts

@@ -0,0 +1,13 @@
+const maps = require('../src/constants/maps').default;
+
+describe('map', () => {
+  Object.keys(maps).map(mapInfoKey => {
+    const map = require(`../assets/${maps[mapInfoKey].file}`);
+    describe(mapInfoKey, () => {
+      it('should have the proper layers', () => {
+        const hasTerrain = map.layers.find(o => o.name === 'terrain');
+        expect(hasTerrain).toBeDefined();
+      });
+    });
+  });
+});

tsconfig.json

@@ -6,6 +6,11 @@
     "lib": ["es2017", "dom"],
     "sourceMap": true
   },
+  "jest": {
+    "globals": {
+      "require": true
+    }
+  },
   "include": ["./src/**/*"],
   "exclude": ["node_modules", "bin", "typings/phaser.d.ts"]
 }

typings/typings.d.ts

@@ -0,0 +1,4 @@
+declare module '*.json' {
+  const value: any;
+  export default value;
+}