toMatchSnapshot
toMatchSnapshot is a Jest matcher used in snapshot testing to compare a value with a previously stored snapshot. It enables the automatic capture of complex data structures, serialized objects, or UI output. On the first run, a snapshot is created and saved to a __snapshots__ file alongside the test. On subsequent runs, the current value is compared to the stored snapshot; if it differs, the test fails and shows a diff.
The matcher can be used with or without additional naming. expect(value).toMatchSnapshot() creates a default snapshot for
Serialization and extensions: Jest supports snapshot serializers to customize how values are rendered, and you can
Updating snapshots: If changes are intentional, snapshots can be updated by running the test command with -u