30:T5dd,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; }31:[] 2e:{"title":"Test Observable","cells":[{"id":12,"value":"# Test Observable","pinned":false,"hidden":false,"mode":"md"},{"id":118,"value":"Unit tests in observable notebooks","pinned":false,"hidden":false,"mode":"md"},{"id":14,"value":"describe(`Test Demo`, 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":5,"value":"expect = require(\"jest-expect-standalone/dist/expect.min.js\").catch(\n (err) => window.expect\n)","pinned":true,"hidden":false,"mode":"ojs"},{"id":8,"value":"$30","pinned":true,"hidden":false,"mode":"ojs"},{"id":10,"value":"async function it(title, action) {\n await describe.it(title, action);\n}","pinned":true,"hidden":false,"mode":"ojs"}],"files":"$W31","stdlib":"1","titling":"auto"}