The answer
Sparingly. Snapshots look thorough but often just confirm nothing changed, including bugs. Use them for pure components with stable output, not for testing behavior, which is better tested with explicit assertions.
Common React Testing Mistakes That Make Tests Fragile
Should I use snapshot testing in React?
More FAQs in Common React Testing Mistakes That Make Tests Fragile
Usually because you are testing implementation details: internal state, instance methods, or child structure. These change during refactors even when behavior is unchanged. Test behavior with role and text queries instead.
No. Class names tie tests to styling. When you change the styling, tests break even though behavior is the same. Use role and text queries instead, which test what the user experiences.
Better than class names, but still an implementation detail. Use them only when role and text queries are not available. The first choice should always be role and accessible name.
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