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// focus-preserve.test.mjs — contract tests for captureFocusState / restoreFocusState
//
// These pure helpers fix the focus-stealing bug: poll() calls renderTaskList /
// renderActiveTaskList which do container.innerHTML='' on every tick, destroying
// any focused answer input (task-answer-input or question-input).
//
// captureFocusState(container, activeEl)
// Returns {taskId, className, value} if activeEl is a focusable answer input
// inside a .task-card within container. Returns null otherwise.
//
// restoreFocusState(container, state)
// Finds the equivalent input after rebuild and restores .value + .focus().
//
// Run with: node --test web/test/focus-preserve.test.mjs
import { describe, it } from 'node:test';
import assert from 'node:assert/strict';
// ── Inline implementations (contract) ─────────────────────────────────────────
function captureFocusState(container, activeEl) {
if (!activeEl || !container.contains(activeEl)) return null;
const card = activeEl.closest('.task-card');
if (!card || !card.dataset || !card.dataset.taskId) return null;
return {
taskId: card.dataset.taskId,
className: activeEl.className,
value: activeEl.value || '',
};
}
function restoreFocusState(container, state) {
if (!state) return;
const card = container.querySelector(`.task-card[data-task-id="${state.taskId}"]`);
if (!card) return;
const el = card.querySelector(`.${state.className}`);
if (!el) return;
el.value = state.value;
el.focus();
}
// ── DOM-like mock helpers ──────────────────────────────────────────────────────
function makeInput(className, value = '', taskId = 't1') {
const card = {
dataset: { taskId },
_children: [],
querySelector(sel) {
const cls = sel.replace(/^\./, '');
return this._children.find(c => c.className === cls) || null;
},
closest(sel) {
return sel === '.task-card' ? this : null;
},
};
const input = {
className,
value,
_focused: false,
focus() { this._focused = true; },
closest(sel) { return card.closest(sel); },
};
card._children.push(input);
return { card, input };
}
function makeContainer(cards = []) {
const allInputs = cards.flatMap(c => c._children);
return {
contains(el) { return allInputs.includes(el); },
querySelector(sel) {
const m = sel.match(/\.task-card\[data-task-id="([^"]+)"\]/);
if (!m) return null;
return cards.find(c => c.dataset.taskId === m[1]) || null;
},
};
}
// ── Tests: captureFocusState ───────────────────────────────────────────────────
describe('captureFocusState', () => {
it('returns null when activeEl is null', () => {
assert.strictEqual(captureFocusState(makeContainer([]), null), null);
});
it('returns null when activeEl is undefined', () => {
assert.strictEqual(captureFocusState(makeContainer([]), undefined), null);
});
it('returns null when activeEl is outside the container', () => {
const { input } = makeInput('task-answer-input', 'hello', 't1');
const container = makeContainer([]); // empty — input not in it
assert.strictEqual(captureFocusState(container, input), null);
});
it('returns null when activeEl has no .task-card ancestor', () => {
const input = {
className: 'task-answer-input',
value: 'hi',
closest() { return null; },
};
const container = { contains() { return true; }, querySelector() { return null; } };
assert.strictEqual(captureFocusState(container, input), null);
});
it('returns state for task-answer-input inside a task card', () => {
const { card, input } = makeInput('task-answer-input', 'partial answer', 't42');
const state = captureFocusState(makeContainer([card]), input);
assert.deepStrictEqual(state, {
taskId: 't42',
className: 'task-answer-input',
value: 'partial answer',
});
});
it('returns state for question-input inside a task card', () => {
const { card, input } = makeInput('question-input', 'my answer', 'q99');
const state = captureFocusState(makeContainer([card]), input);
assert.deepStrictEqual(state, {
taskId: 'q99',
className: 'question-input',
value: 'my answer',
});
});
it('returns empty string value when input is empty', () => {
const { card, input } = makeInput('task-answer-input', '', 't1');
const state = captureFocusState(makeContainer([card]), input);
assert.strictEqual(state.value, '');
});
});
// ── Tests: restoreFocusState ───────────────────────────────────────────────────
describe('restoreFocusState', () => {
it('is a no-op when state is null', () => {
restoreFocusState(makeContainer([]), null); // must not throw
});
it('is a no-op when state is undefined', () => {
restoreFocusState(makeContainer([]), undefined); // must not throw
});
it('is a no-op when task card is no longer in container', () => {
const state = { taskId: 'gone', className: 'task-answer-input', value: 'hi' };
restoreFocusState(makeContainer([]), state); // must not throw
});
it('restores value and focuses task-answer-input', () => {
const { card, input } = makeInput('task-answer-input', '', 't1');
const state = { taskId: 't1', className: 'task-answer-input', value: 'restored text' };
restoreFocusState(makeContainer([card]), state);
assert.strictEqual(input.value, 'restored text');
assert.ok(input._focused, 'input should have been focused');
});
it('restores value and focuses question-input', () => {
const { card, input } = makeInput('question-input', '', 'q7');
const state = { taskId: 'q7', className: 'question-input', value: 'type answer' };
restoreFocusState(makeContainer([card]), state);
assert.strictEqual(input.value, 'type answer');
assert.ok(input._focused);
});
it('is a no-op when element className is not found in rebuilt card', () => {
const { card } = makeInput('task-answer-input', '', 't1');
const state = { taskId: 't1', className: 'nonexistent-class', value: 'hi' };
restoreFocusState(makeContainer([card]), state); // must not throw
});
});
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