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// filter.test.mjs — TDD contract tests for filterTasks
//
// filterTasks is defined inline here to establish the expected behaviour.
// Once filterTasks is added to web/app.js (or a shared module), remove the
// inline definition and import it instead.
//
// Run with: node --test web/test/filter.test.mjs
import { describe, it } from 'node:test';
import assert from 'node:assert/strict';
// ── Implementation under contract ─────────────────────────────────────────────
// Remove this block once filterTasks is exported from app.js / a shared module.
const HIDE_STATES = new Set(['COMPLETED', 'FAILED']);
function filterTasks(tasks, hideCompletedFailed = false) {
if (!hideCompletedFailed) return tasks;
return tasks.filter(t => !HIDE_STATES.has(t.state));
}
// ── Helpers ────────────────────────────────────────────────────────────────────
function makeTask(state) {
return { id: state, name: `task-${state}`, state };
}
// ── Tests ──────────────────────────────────────────────────────────────────────
describe('filterTasks', () => {
it('removes COMPLETED tasks when hideCompletedFailed=true', () => {
const tasks = [makeTask('COMPLETED'), makeTask('PENDING')];
const result = filterTasks(tasks, true);
assert.ok(!result.some(t => t.state === 'COMPLETED'), 'COMPLETED should be excluded');
assert.equal(result.length, 1);
});
it('removes FAILED tasks when hideCompletedFailed=true', () => {
const tasks = [makeTask('FAILED'), makeTask('RUNNING')];
const result = filterTasks(tasks, true);
assert.ok(!result.some(t => t.state === 'FAILED'), 'FAILED should be excluded');
assert.equal(result.length, 1);
});
it('returns all tasks when hideCompletedFailed=false', () => {
const tasks = [
makeTask('COMPLETED'),
makeTask('FAILED'),
makeTask('PENDING'),
makeTask('RUNNING'),
];
const result = filterTasks(tasks, false);
assert.equal(result.length, 4, 'all tasks should be returned');
assert.deepEqual(result, tasks);
});
it('returns all tasks when hideCompletedFailed is omitted (default false)', () => {
const tasks = [makeTask('COMPLETED'), makeTask('FAILED'), makeTask('QUEUED')];
const result = filterTasks(tasks);
assert.equal(result.length, 3);
});
it('includes PENDING, QUEUED, RUNNING, TIMED_OUT, CANCELLED, BUDGET_EXCEEDED when hiding', () => {
const activeStates = ['PENDING', 'QUEUED', 'RUNNING', 'TIMED_OUT', 'CANCELLED', 'BUDGET_EXCEEDED'];
const tasks = activeStates.map(makeTask);
const result = filterTasks(tasks, true);
assert.equal(result.length, activeStates.length, 'all non-terminal active states should be kept');
for (const state of activeStates) {
assert.ok(result.some(t => t.state === state), `${state} should be included`);
}
});
it('returns an empty array when given an empty array', () => {
assert.deepEqual(filterTasks([], true), []);
assert.deepEqual(filterTasks([], false), []);
});
});
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