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Update SnapshotTesting.md (#7671)
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@roachjc @rickhanlonii
roachjc authored and rickhanlonii committed Jan 21, 2019
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Expand Up @@ -5,7 +5,7 @@ title: 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 for a mobile app renders a UI component, takes a screenshot, then compares it to a reference image stored alongside the test. The test will fail if the two images do not match: either the change is unexpected, or the screenshot needs to be updated to the new version of the UI component.
A typical snapshot test case for a mobile app 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.

## Snapshot Testing with Jest

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