add "mocha" unit testing

ui/.eslintrc.js

@@ -1,18 +1,34 @@
 module.exports = {
   root: true,
+
   env: {
     node: true
   },
+
   'extends': [
     'plugin:vue/vue3-essential',
     'eslint:recommended',
     '@vue/typescript/recommended'
   ],
+
   parserOptions: {
     ecmaVersion: 2020
   },
+
   rules: {
     'no-console': process.env.NODE_ENV === 'production' ? 'warn' : 'off',
     'no-debugger': process.env.NODE_ENV === 'production' ? 'warn' : 'off'
+  },
+
+  overrides: [
+    {
+      files: [
+        '**/__tests__/*.{j,t}s?(x)',
+        '**/tests/unit/**/*.spec.{j,t}s?(x)'
+      ],
+      env: {
+        mocha: true
       }
+    }
+  ]
 }

ui/package.json

@@ -5,6 +5,7 @@
   "scripts": {
     "serve": "vue-cli-service serve",
     "build": "vue-cli-service build",
+    "test:unit": "vue-cli-service test:unit",
     "lint": "vue-cli-service lint"
   },
   "dependencies": {
@@ -17,15 +18,20 @@
     "@fortawesome/free-brands-svg-icons": "^6.2.1",
     "@fortawesome/free-solid-svg-icons": "^6.2.1",
     "@fortawesome/vue-fontawesome": "^3.0.2",
+    "@types/chai": "^4.2.15",
+    "@types/mocha": "^8.2.1",
     "@typescript-eslint/eslint-plugin": "^5.4.0",
     "@typescript-eslint/parser": "^5.4.0",
     "@vue/cli-plugin-babel": "~5.0.0",
     "@vue/cli-plugin-eslint": "~5.0.0",
     "@vue/cli-plugin-typescript": "~5.0.0",
+    "@vue/cli-plugin-unit-mocha": "~5.0.0",
     "@vue/cli-service": "~5.0.0",
     "@vue/eslint-config-typescript": "^9.1.0",
+    "@vue/test-utils": "^2.0.0-0",
     "axios": "^1.1.3",
     "bulma": "^0.9.4",
+    "chai": "^4.2.0",
     "eslint": "^7.32.0",
     "eslint-plugin-vue": "^8.0.3",
     "sass": "^1.55.0",

ui/tests/unit/rectangle.spec.ts

@@ -0,0 +1,23 @@
+import { Vector2D } from '@/components/rects/rectangles';
+import { expect } from "chai";
+
+describe("Vector Tests", () => {
+  const v = new Vector2D(1, 2);
+
+  it("should create a vector", () => {
+    expect(v.x).to.equal(1);
+    expect(v.y).to.equal(2);
+  });
+
+  it("should add vectors", () => {
+    const v2 = v.plus(new Vector2D(3, 4));
+    expect(v2.x).to.equal(4);
+    expect(v2.y).to.equal(6);
+  });
+
+  it("should subtract vectors", () => {
+    const v2 = v.minus(new Vector2D(3, 4));
+    expect(v2.x).to.equal(-2);
+    expect(v2.y).to.equal(-2);
+  });
+});

ui/tsconfig.json

@@ -14,7 +14,9 @@
     "sourceMap": true,
     "baseUrl": ".",
     "types": [
-      "webpack-env"
+      "webpack-env",
+      "mocha",
+      "chai"
     ],
     "paths": {
       "@/*": [