31:T544,describe={ const formatMessage = (msg, color) => html`

${msg}

` let describePromise = Promise.resolve(); let itPromise = Promise.resolve(); let report, counter; async function* describe(title, action) { let prev = describePromise; let start, startPromise = new Promise(y => start = y); describePromise = describePromise .then(() => startPromise) // Wait until the "div" element for reports is attached to the DOM .then(action) .catch(err => {}).then(() => itPromise); await prev; counter = 0; let container = html`

${title ? html`

${title}

` : ''}

`; report = html`

`; container.appendChild(report); yield container; start(); } describe.it = (title, action) => { const id = ++counter; itPromise = itPromise.then(async () => { try { await action(); report.appendChild(formatMessage(`[${id}] Success: ${title || "test passed"}`, "green")); } catch (error) { const message = (error + '').split('\n').map(_ => ` > ${_}`).join('\n'); report.appendChild(formatMessage(html`[${id}] Failure: ${title || "test failed"}

${message}

`, "red")); } }); } return describe; }32:[] 2f:{"title":"Unit Tests in Notebooks","cells":[{"id":0,"value":"md`# Unit Tests in Notebooks`","pinned":true,"hidden":false,"mode":"ojs"},{"id":13,"value":"md`## Example of Usage`","pinned":true,"hidden":false,"mode":"ojs"},{"id":15,"value":"describe(`My Test`, async () => {\n it(`should work`, async () => {\n expect(1 + 2).toEqual(3);\n })\n it(`should fail`, async () => {\n expect(2 + 2).toEqual(5);\n });\n it(`should work with async operations as well`, async () => {\n expect(1 + 1).toEqual(2);\n await Promises.delay(100);\n expect(1 + 2).toEqual(3);\n })\n})","pinned":true,"hidden":false,"mode":"ojs"},{"id":10,"value":"md`## Main Methods`","pinned":false,"hidden":false,"mode":"ojs"},{"id":7,"value":"async function it(title, action) {\n await describe.it(title, action);\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":5,"value":"$31","pinned":true,"hidden":false,"mode":"ojs"},{"id":4,"value":"expect = require(\"jest-expect-standalone/dist/expect.min.js\").catch(err => window.expect);","pinned":true,"hidden":false,"mode":"ojs"}],"files":"$W32","stdlib":"1","titling":"auto"}