Merge pull request #10169 from marmelab/extend-expect-with-testing-li…

…brary

expand expect with testing-library helper for all tests

test-setup.js

@@ -1,3 +1,9 @@
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom';
+
 // Ignore warnings about act()
 // See https://github.com/testing-library/react-testing-library/issues/281,
 // https://github.com/facebook/react/issues/14769