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Challenge

Now it's time to apply what you've learned about testing in Rust! In this module's challenge, you'll:

  1. Write unit tests for core functionality:

    • Add tests for the User model to verify email validation works correctly
    • Test password hashing and verification functionality
    • Ensure that the business logic in your core domain behaves as expected

  2. Create a mock implementation of the DataAccess trait:

    • Implement a test-specific version of your DataAccess trait
    • Make it store data in memory for testing purposes
    • Use it to test your API handlers without needing a real database

  3. Write integration tests for API endpoints:

    • Create a new directory and for running integration tests mkdir integration-tests && cd integration-tests && cargo init
    • Test successful registration and login
info

You'll need a couple of additional crates for writing integration tests. The dependencies in your Cargo.toml should be:

[dev-dependencies]
tokio = { version = "1.38", features = ["macros", "rt-multi-thread"] }
serde_json = "1.0"
reqwest = { version = "0.12", default-features = false, features = [
  "rustls-tls",
  "http2",
] }

[dependencies.uuid]
version = "1.16.0"
# Lets you generate random UUIDs
features = [
    "v4",
]
  1. Ensure all tests are passing:
    • Run cargo test and fix any failing tests

The starter code for this challenge is available on GitHub.

If you're struggling, you can find a solution on GitHub. Try it on your own first, if you're finding it difficult that's good. It means you're learning.

Good luck! Remember that comprehensive testing is a key part of building reliable Rust applications, and Rust's type system works with you to catch many potential issues at compile time.