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Implement a function to add a non-empty todo to the list. Reject empty/whitespace inputs. Provide unit tests.
- Acceptance: add non-empty todo at head
- Edge-case: reject empty / whitespace
- Tests: coverage ≥ 90%
export type Todo = { id: string; text: string; done: boolean };
export function addTodo(list: Todo[], text: string) {
const t = text.trim();
if (!t) throw new Error('Empty');
const todo: Todo = { id: crypto.randomUUID(), text: t, done: false };
return [todo, ...list];
}
// add-todo.test.ts
import { addTodo } from './add-todo';
test('adds non-empty todo', () => {
const out = addTodo([], 'Ship DevSim');
expect(out[0].text).toBe('Ship DevSim');
});
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