https://github.com/arthurgousset/jest

✨ Jest cheat sheet
https://github.com/arthurgousset/jest

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✨ Jest cheat sheet

• Host: GitHub
• URL: https://github.com/arthurgousset/jest
• Owner: arthurgousset
• Created: 2023-11-01T14:36:44.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2023-11-01T15:16:16.000Z (about 1 year ago)
• Last Synced: 2024-10-14T01:13:20.376Z (about 1 month ago)
• Homepage:
• Size: 1000 Bytes
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
## Snapshot testing

> Snapshot tests are a very useful tool whenever you want to make sure your UI does not change

> unexpectedly.

>

> A typical snapshot test case renders a UI component, takes a snapshot, then compares it to a

> reference snapshot file stored alongside the test. The test will fail if the two snapshots do

> not match: either the change is unexpected, or the reference snapshot needs to be updated to the

> new version of the UI component.

Source: [jestjs.io](https://jestjs.io/docs/snapshot-testing)

Came across this in a `viem` test using `toMatchInlineSnapshot()`.

```ts

test("gasPrice", async () => {

    expect(

        await signTransaction(walletClient, {

            account: privateKeyToAccount(sourceAccount.privateKey),

            ...baseLegacy,

            gasPrice: parseGwei("20"),

        })

    ).toMatchInlineSnapshot(

        '"0xf8518203118504a817c800825208808080259f672886c0db7d3a2710b5bb8b64fd516ff4fede94f34e76b22f451e5ff92ecfa0627283bbafb0600cd997c8dbfa6f4173c5376e2c4c57967541e171fb110b6d64"'

    );

});

```

See comment in [code review](https://github.com/clabs-co/viem/pull/6#discussion_r1378906295).