require-to-throw-message.md

Pattern: Missing error message

Issue: -

Description

Using toThrow() or toThrowError() without an error message makes it harder to identify what error was expected. Always include an error message to make test failures more descriptive.

Examples

Example of incorrect code:

expect(() => fn()).toThrow();
expect(() => fn()).toThrowError();
await expect(promise()).rejects.toThrow();

Example of correct code:

expect(() => fn()).toThrow("Invalid input");
expect(() => fn()).toThrowError("User not found");
await expect(promise()).rejects.toThrow("Network error");