Adding vitest for testing

Currently implemented

- FormatBytes
- MathHelpers

ReadMe.md

@@ -95,24 +95,24 @@ Parse URL for looking up entries in the paramegter list
 
 ## Build
 
-Build with the following commands, the output will be stored in "build/js/utilsAll.js" and "build/js/utilsAll.min.js"
+Build with the following commands, the output will be stored in "build/js/output/utils.js" and "build/js/output/utils.min.js"
 
 For full not minified version
 
 ```sh
-npm build utilsAll-build
+npm build utils-build
 ```
 
 For minified build (but keeps the function names as is)
 
 ```sh
-npm build utilsAll-min-build
+npm build utils-min-build
 ```
 
 Or build both at the same time
 
 ```sh
-npm build utilsAll-build-all
+npm build utils-build-all
 ```
 
 ## Develop
@@ -126,5 +126,29 @@ npm install
 Run watch
 
 ```sh
-npm run utilsAll-develop
+npm run utils-develop
 ```
+
+## Test
+
+A simple test script is located in "build/test.html"
+
+### General function tests
+
+vitest is used for all usage tests
+
+```sh
+npx vitest
+```
+
+Currently covered:
+
+- FormatBytes
+- MathHelpers
+
+TODO:
+
+- JavaScriptHelpers
+- StringHelpers
+- UniqIdGenerators
+- UrlParser