Make sure your function really throws what you expect

Workaround for jestjs/jest#8140

With npm:

npm install --save-dev jest-matcher-specific-error

With yarn:

yarn add -D jest-matcher-specific-error

Same as Other Jest matchers.

Same as Other Jest matchers.

await expect(yourPromise).rejects.toMatchError(expectedError);
await expect(yourFunction).rejects.toMatchError(expectedError);
expect(yourError).toMatchError(expectedError);

Errors threated as equal if ALL conditions satisfied:

• Errors are instances of same class (strict === comparison by reference)
• Error messages are equal
• All error public fields are deeply equal (default jest helper comparison)

Error stack traces are ignored.