Adding mocha & chai

Also added a sanity test!

Many thanks to the posters at:
- https://dev.to/daniel_werner/testing-typescript-with-mocha-and-chai-5cl8
- https://gist.github.com/jordansexton/2a0c3c360aa700cc9528e89620e82c3d
- mochajs/mocha-examples#47

.mocharc.json

@@ -0,0 +1,8 @@
+{
+	"extension": ["ts"],
+	"node-option": [
+		"experimental-specifier-resolution=node",
+		"loader=ts-node/esm"
+	],
+	"spec": ["./**/*.test.ts"]
+}

package.json

@@ -26,15 +26,19 @@
 	"main": "./source/main.js",
 	"type": "module",
 	"scripts": {
-		"test": "node --loader ts-node/esm ./source/tests/main.test.ts"
+		"test": "mocha"
 	},
 	"dependencies": {
 		"fast-cartesian": "^6.1.0",
 		"mathjs": "^10.4.0"
 	},
 	"devDependencies": {
+		"@types/chai": "^4.3.0",
+		"@types/mocha": "^9.1.0",
 		"@types/node": "^17.0.16",
-		"ts-node": "^10.5.0",
+		"chai": "^4.3.6",
+		"mocha": "^9.2.2",
+		"ts-node": "^10.7.0",
 		"typescript": "^4.5.5"
 	}
 }

source/tests/sanity.test.ts

@@ -0,0 +1,8 @@
+import 'mocha'
+import { expect } from 'chai'
+
+describe('Sanity test', () => {
+	it('Should ensure true to be true', () => {
+		expect(true).to.equal(true)
+	})
+})