Snapshots are a fantastic tool for identifying unexpected interface changes within your application – whether that interface is an API response, UI, logs, or error messages. Other ways this can be done is using the snapshot serializer or mocking the library responsible for generating the random part of the code you're snapshotting. toMatchInlineSnapshot() with no arguments: This means you can get the benefits of automatically generated snapshots without having to switch to an external file to make sure the correct value was written.įirst, you write a test, calling. snap files), except the snapshot values are written automatically back into the source code. Inline snapshots behave identically to external snapshots (. Once you're finished, Jest will give you a summary before returning back to watch mode: Once you enter Interactive Snapshot Mode, Jest will step you through the failed snapshots one test at a time and give you the opportunity to review the failed output.įrom here you can choose to update that snapshot or skip to the next: Interactive Snapshot Mode įailed snapshots can also be updated interactively in watch mode: You can try out this functionality by cloning the snapshot example, modifying the Link component, and running Jest. If you'd like to limit which snapshot test cases get re-generated, you can pass an additional -testNamePattern flag to re-record snapshots only for those tests that match the pattern. If we had any additional failing snapshot tests due to an unintentional bug, we would need to fix the bug before re-generating snapshots to avoid recording snapshots of the buggy behavior. This will re-generate snapshot artifacts for all failing snapshot tests. You may also use the equivalent single-character -u flag to re-generate snapshots if you prefer. Go ahead and accept the changes by running the above command.
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