Add some testing hints

src/utils/testing.js

@@ -6,6 +6,32 @@ import { HashRouter as DOMRouter } from 'react-router-dom';
 import theme from '../theme';
 import I18n from '../I18n';
 
+/*
+This is wrapper for the render method in order to provide all required providers and
+not to repeat them for each test.
+
+If you want to debug a test by having a look at the current output of the component,
+simply import the "screen" object from this file and use the "debug()" method:
+
+    test('displays the header and paragraph text', () => {
+        render(<Travel />)
+        screen.debug()
+    })
+
+or of a specific element in the component:
+
+    test('displays the header and paragraph text', () => {
+        render(<Travel />)
+        const header = screen.getByRole('heading', { name: /travel anywhere/i })
+        screen.debug(header)
+    })
+
+More about "render" and "screen" on https://testing-library.com/docs
+
+For testing certain conditions, check out https://jestjs.io/docs/expect and for
+running tests, check out https://jestjs.io/docs/api.
+*/
+
 const AllTheProviders = ({ children }) => {
 	return (
 		<StyledEngineProvider injectFirst>

src/views/Edit/Sources/Network.test.js

@@ -1,5 +1,5 @@
 import React from 'react';
-import { render, fireEvent, screen } from '../../../utils/testing';
+import { render, fireEvent } from '../../../utils/testing';
 import '@testing-library/jest-dom';
 
 import * as Network from './Network';