Replace thirdparty parse-ms with my own, and add tests

tests/parse-ms.test.js

@@ -0,0 +1,12 @@
+const parseMS = require('../util/parseMS')
+const fs = require('fs')
+
+const file = 'tests/expected/parse-ms-expected.json';
+const expectedOutput = JSON.parse(fs.readFileSync(file, {encoding: "utf-8"}));
+
+test("Testing my parseMS", () => {
+    for(let i = 0; i < expectedOutput.length; i++){
+        const ms = i * i * 2;
+        expect(parseMS(ms)).toStrictEqual(expectedOutput[i])        
+    }
+})