'Error: no test specified' with Mocha and NPM

Wassup mates,

I am currently learning about the test components of php/webpack.

I have installed the Mochapack Fork, because the originial caused issues for no reasons (chunk error or something similar => npm run dev).

However, I did a fresh npm installation & achieved to use npm test with the named package installed.

Here is the actual issue: Now I wanna use the 'test' option of mochapack to test an Example .vue file for its propriety.

To use it in combination with laravel mix, I have to set the path to laravel's webpack.config.js and my testing files exactly and updated my package.json

Now everytime I type npm run test, I get an error telling me '(...) no test specified'

What did I do wrong?

{
    "private": true,
    "scripts": {
        "dev": "npm run development",
        "development": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
        "watch": "npm run development -- --watch",
        "watch-poll": "npm run watch -- --watch-poll",
        "hot": "cross-env NODE_ENV=development node_modules/webpack-dev-server/bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
        "prod": "npm run production",
        "production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --no-progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
        "test:": "mochapack --webpack-config=node_modules/laravel-mix/setup/webpack.config.js --require tests/JavaScript/setup.js tests/JavaScript/**/*.spec.js"
    },
    "devDependencies": {
        "axios": "^0.18",
        "bootstrap": "^4.1.0",
        "cross-env": "^5.1",
        "expect": "^24.8.0",
        "jquery": "^3.2",
        "jsdom": "^15.1.1",
        "laravel-mix": "^4.0.7",
        "lodash": "^4.17.5",
        "mocha": "^6.2.0",
        "mochapack": "^1.1.2",
        "popper.js": "^1.12",
        "resolve-url-loader": "^2.3.1",
        "sass": "^1.15.2",
        "sass-loader": "^7.1.0",
        "vue": "^2.5.17",
        "vue-template-compiler": "^2.6.10",
        "vue-test-utils": "^1.0.0-beta.11",
        "webpack": "^4.20.2",
        "webpack-cli": "^3.3.6",
        "webpack-dev-middleware": "^3.7.0",
        "webpack-dev-server": "^3.7.2",
        "webpack-hot-middleware": "^2.25.0"
    }
}