feat: Test running overhaul, switch to Prettier & reformat everything (#1407)

* chore: Switch to Node 20 + Vitest

* chore: migrate to vitest mock functions

* chore: code style (switch to prettier)

* test: re-enable long-running test

Seems the switch to Node 20 and Vitest has vastly improved the code's and / or the test's runtime!

see #1193

* chore: code style

* chore: fix failing tests

* Updated Documentation in README.md

* Update contribution guidelines to state usage of Prettier

* fix: set prettier printWidth back to 80

* chore: apply updated code style automatically

* fix: set prettier line endings to lf again

* chore: apply updated code style automatically

---------

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: Lars Müller <34514239+appgurueu@users.noreply.github.com>

Timing-Functions/GetMonthDays.js

@@ -10,19 +10,25 @@ const getMonthDays = (monthNumber, year) => {
   const the31DaysMonths = [1, 3, 5, 7, 8, 10, 12]
   const the30DaysMonths = [4, 6, 9, 11]
 
-  if (!the31DaysMonths.includes(monthNumber) && !the30DaysMonths.includes(monthNumber) &&
-    (monthNumber !== 2)
+  if (
+    !the31DaysMonths.includes(monthNumber) &&
+    !the30DaysMonths.includes(monthNumber) &&
+    monthNumber !== 2
   ) {
     throw new TypeError('Invalid Month Number.')
   }
 
-  if (the31DaysMonths.includes(monthNumber)) { return 31 }
+  if (the31DaysMonths.includes(monthNumber)) {
+    return 31
+  }
 
-  if (the30DaysMonths.includes(monthNumber)) { return 30 }
+  if (the30DaysMonths.includes(monthNumber)) {
+    return 30
+  }
 
   // Check for Leap year
   if (year % 4 === 0) {
-    if ((year % 100 !== 0) || (year % 100 === 0 && year % 400 === 0)) {
+    if (year % 100 !== 0 || (year % 100 === 0 && year % 400 === 0)) {
       return 29
     }
   }

Timing-Functions/IntervalTimer.js

@@ -12,8 +12,7 @@ class IntervalTimer {
    * @param callBack The callback function to be executed.
    * @return {IntervalTimer} If exists, the existing object.
    */
-  constructor (interval = 10,
-    callBack = () => {}) {
+  constructor(interval = 10, callBack = () => {}) {
     this.prevInterval = 0
     if (this.instance == null) {
       this.interval = interval
@@ -27,7 +26,7 @@ class IntervalTimer {
   /**
    * @description Starts the timer.
    */
-  startTimer () {
+  startTimer() {
     this.timer = setInterval(this.callBack, this.interval)
   }
 
@@ -35,7 +34,7 @@ class IntervalTimer {
    * @description Resets the timer.
    * @return {number} Elapsed time in milliseconds.
    */
-  resetTimer () {
+  resetTimer() {
     clearInterval(this.timer)
     this.callBack = () => {}
     return this.getElapsedTime()
@@ -44,7 +43,7 @@ class IntervalTimer {
   /**
    * @return {number} Elapsed time in milliseconds since reset.
    */
-  getElapsedTime (offset = 0) {
+  getElapsedTime(offset = 0) {
     this.timeElapsed = this.timer - this.prevInterval
     this.prevInterval = this.timer
     return this.timeElapsed - offset
@@ -53,7 +52,7 @@ class IntervalTimer {
   /**
    * @return {number} Elapsed time since start.
    */
-  getRunTime () {
+  getRunTime() {
     return this.timer
   }
 }
@@ -63,7 +62,7 @@ class IntervalTimer {
  * Saturday, 01 August 2020 8:33 AM
  * @description Example usage
  */
-const ExampleIntervalTimer = function (output = v => console.log(v)) {
+const ExampleIntervalTimer = function (output = (v) => console.log(v)) {
   /**
    * Create am object with default settings.
    * @type {IntervalTimer} Used to get timing information.

Timing-Functions/test/GetMonthDays.test.js

@@ -14,6 +14,8 @@ describe('Get the Days of a Month', () => {
   })
 
   it('expects to throw a type error', () => {
-    expect(() => { getMonthDays(13, 2020) }).toThrow('Invalid Month Number.')
+    expect(() => {
+      getMonthDays(13, 2020)
+    }).toThrow('Invalid Month Number.')
   })
 })