Question 1

How do I update snapshots in insta when my code changes?

Accepted Answer

Use the cargo-insta tool with commands like cargo insta review to interactively approve or reject changes. This integrates with the testing workflow, allowing you to manage snapshots efficiently.

Question 2

Does insta work with async tests in Rust?

Accepted Answer

Yes, insta can be used in async tests since it integrates with Rust's standard testing framework. Ensure snapshots are captured within async contexts, though it may require careful handling of futures.

Question 3

What's the difference between insta and using assert_eq for testing?

Accepted Answer

Insta provides snapshot testing with diffing and review tools for complex or changing data, while assert_eq is for simple equality checks. Insta excels for large outputs or frequent changes, whereas assert_eq is better for deterministic, small comparisons.

Question 4

How to ignore certain fields in insta snapshots?

Accepted Answer

Insta supports redaction and filtering through settings, allowing you to exclude or mask specific parts of the data. Check the documentation for details on using redaction macros to focus on relevant changes.

Question 5

Can I use insta without the VSCode extension?

Accepted Answer

Yes, insta functions via command-line with cargo-insta, and the core library works independently. The extension is optional for enhanced editor support, but not required for basic usage.

Question 6

What are best practices for organizing snapshots in insta?

Accepted Answer

Keep snapshots close to tests with descriptive names, use inline snapshots for simplicity, and regularly review and clean up outdated ones. The cargo-insta tool helps automate parts of this process.

insta

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