(dev) remove rewire, add babel-plugin-rewire. (#44)

* removed rewire. now using babel-rewire instead

* implemented more tests

* changed some eslint params

* linting

* linting

* coverage on getChant

Co-authored-by: Marcus Netz <marcus.netz@godyo.com>

__tests__/commands/Roll.js

@@ -0,0 +1,12 @@
+require('module-alias/register');
+require('babel-plugin-rewire');
+
+const command = require('@Commands/Roll');
+//const exec = command.__get__('exec');
+describe('roll command', () => {
+    const message = { reply: str => str };
+    it('should not return anything without correct arguments', () => {
+        const args = ['1'];
+        expect(command.exec(message, args)).resolves.toBeUndefined();
+    });
+});