Adding tests

[faboweb]

Some more tests for the main process missing.

[mappum]

Hey @faboweb, thanks for the awesome work on the tests! The startup process look really thorough and really needed this, and you're basically carrying the team right now 💯

I can't get it to run on my machine yet though, I get an error from jest, any idea how to fix:

> cross-env LOGGING=false jest

YError: Invalid first argument. Expected string or function but received boolean.
    at argumentTypeError (/Users/mappum/Projects/cosmos-ui/node_modules/yargs/lib/argsert.js:70:9)
    at /Users/mappum/Projects/cosmos-ui/node_modules/yargs/lib/argsert.js:52:39
    at Array.forEach (<anonymous>)
    at module.exports (/Users/mappum/Projects/cosmos-ui/node_modules/yargs/lib/argsert.js:45:21)
    at Object.Yargs.self.version (/Users/mappum/Projects/cosmos-ui/node_modules/yargs/yargs.js:718:5)
    at _buildArgv (/Users/mappum/Projects/cosmos-ui/node_modules/jest/node_modules/jest-cli/build/cli/index.js:118:3)
    at Object.<anonymous> (/Users/mappum/Projects/cosmos-ui/node_modules/jest/node_modules/jest-cli/build/cli/index.js:37:18)
    at Generator.next (<anonymous>)
    at step (/Users/mappum/Projects/cosmos-ui/node_modules/jest/node_modules/jest-cli/build/cli/index.js:45:2466)
    at /Users/mappum/Projects/cosmos-ui/node_modules/jest/node_modules/jest-cli/build/cli/index.js:45:2696

```i

[faboweb]

No worries, I have fun :)
Can you try running just jest (without cross-env) and jest .* (providing a file glob as first argument)?

[mappum]

👍