import { resolve } from 'rsvp'; import { test } from 'qunit'; import sinon from 'sinon'; import { settled } from '@ember/test-helpers'; const MockResponse = (json) => ({ ok: true, json() { return resolve(json); }, }); export default function statsTrackerFrameMissing({ resourceName, TrackerConstructor, ResourceConstructor, mockFrame, compileResources, }) { test('a bad response from a fetch request is handled gracefully', async function (assert) { const frame = mockFrame(1); const [compiledCPU, compiledMemory] = compileResources(frame); let shouldFail = false; const fetch = () => { return resolve(shouldFail ? { ok: false } : MockResponse(frame)); }; const resource = ResourceConstructor(); const tracker = TrackerConstructor.create({ fetch, [resourceName]: resource, }); tracker.get('poll').perform(); await settled(); assert.deepEqual(tracker.get('cpu'), [compiledCPU], 'One frame of cpu'); assert.deepEqual( tracker.get('memory'), [compiledMemory], 'One frame of memory' ); shouldFail = true; tracker.get('poll').perform(); await settled(); assert.deepEqual( tracker.get('cpu'), [compiledCPU], 'Still one frame of cpu' ); assert.deepEqual( tracker.get('memory'), [compiledMemory], 'Still one frame of memory' ); assert.equal(tracker.get('frameMisses'), 1, 'Frame miss is tracked'); shouldFail = false; tracker.get('poll').perform(); await settled(); assert.deepEqual( tracker.get('cpu'), [compiledCPU, compiledCPU], 'Still one frame of cpu' ); assert.deepEqual( tracker.get('memory'), [compiledMemory, compiledMemory], 'Still one frame of memory' ); assert.equal(tracker.get('frameMisses'), 0, 'Frame misses is reset'); }); test('enough bad responses from fetch consecutively (as set by maxFrameMisses) results in a pause', async function (assert) { const fetch = () => { return resolve({ ok: false }); }; const resource = ResourceConstructor(); const tracker = TrackerConstructor.create({ fetch, [resourceName]: resource, maxFrameMisses: 3, pause: sinon.spy(), }); tracker.get('poll').perform(); await settled(); assert.equal(tracker.get('frameMisses'), 1, 'Tick misses'); assert.notOk(tracker.pause.called, 'Pause not called yet'); tracker.get('poll').perform(); await settled(); assert.equal(tracker.get('frameMisses'), 2, 'Tick misses'); assert.notOk(tracker.pause.called, 'Pause still not called yet'); tracker.get('poll').perform(); await settled(); assert.equal(tracker.get('frameMisses'), 0, 'Misses reset'); assert.ok( tracker.pause.called, 'Pause called now that frameMisses == maxFrameMisses' ); }); }