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Showing SKILL.md
| name | testing-jest-edge-case-testing |
| description | null |
Category: testing-jest · Status: 🟢 Active
Khi cần phủ biên: boundary, null/empty, async lỗi, race condition.
null, undefined, [], {}, '' — kiểm tra không crash.it.each để chạy nhiều input biên gọn gàng.it.each([
['', 'Email là bắt buộc'],
['abc', 'Email không hợp lệ'],
])('input %s → lỗi %s', (input, msg) => {
expect(validateEmail(input)).toBe(msg);
});
it('hiển thị lỗi khi API thất bại', async () => {
(fetchData as jest.Mock).mockRejectedValue(new Error('fail'));
render(<List />);
expect(await screen.findByText(/đã có lỗi/i)).toBeInTheDocument();
});
Good: phủ boundary + null/empty + reject + race, dùng it.each. Avoid: chỉ test happy path, bỏ qua nhánh reject, không test giá trị rỗng.