• react-hooks-testing-library version: 5.0.0
• react-test-renderer version: not installed
• react version: 17.0.1
• node version: 17.0.1
• npm (or yarn) version: yarn@1.22.0

Relevant code or config:

const { renderHook } = require("@testing-library/react-hooks/dom/pure");
let consoleError;
beforeEach(() => {
 consoleError = console.error;
});
afterEach(() => {
 if (console.error !== consoleError) {
 throw new Error("Did not cleanup console.error");
 }
});
test("pure", () => {
 function useHook() {
 return useState(false);
 }
 const { result } = renderHook(() => useHook(), {});
});

What you did:

Use @testing-library/dom/pure in karma-mocha though the problem happens in arbitrary testing frameworks I suspect

What happened:

console.error was not cleaned up

Reproduction:

https://github.com/eps1lon/testing-library-react-hooks-impure

Problem description:

We check for mistakes in afterEach if a test was not properly cleaned up. One of those checks looks at console.error.

Suggested solution:

renderHook probably has some global side-effects. These should be documented by explaining why they exists and how to disable them or work around them.