debian-mirror-gitlab/spec/frontend/__mocks__/lodash/debounce.js

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2020-04-22 19:07:51 +05:30
// `lodash/debounce` has a non-trivial implementation which can lead to
// [flaky spec errors][1]. This mock simply makes `debounce` calls synchronous.
//
// In the future we could enhance this by injecting some test values in
// the function passed to it. See [this issue][2] for more information.
//
// [1]: https://gitlab.com/gitlab-org/gitlab/-/issues/212532
// [2]: https://gitlab.com/gitlab-org/gitlab/-/issues/213378
// Further reference: https://github.com/facebook/jest/issues/3465
2020-11-24 15:15:51 +05:30
export default fn => {
const debouncedFn = jest.fn().mockImplementation(fn);
debouncedFn.cancel = jest.fn();
debouncedFn.flush = jest.fn().mockImplementation(() => {
const errorMessage =
"The .flush() method returned by lodash.debounce is not yet implemented/mocked by the mock in 'spec/frontend/__mocks__/lodash/debounce.js'.";
throw new Error(errorMessage);
});
return debouncedFn;
};