Testing
Test Organization in Rust for Large Workspaces Explained
Organize Rust tests in a large workspace: unit tests beside code, integration tests per crate, a shared test-support crate, slow test gating and what to run in CI.
2 min read
Topic
Testing
Unit, doc and integration tests, property testing and mocks, enough to refactor without flinching.
Testing
Mocking in Rust With Mockall and When Fakes Are Better
Test code that calls out to services with a hand-written fake or a Mockall mock. Compare setup cost, what each can assert and the cases where a fake is the better tool.
3 min read
Architecture
Library or Binary Splitting a Rust Crate for Testability
Put logic in a library crate and keep main.rs thin, so tests can call functions, integration tests see the public API and other binaries can reuse the code.
3 min read
Web
Axum Testing With Tower Oneshot and In Memory Requests
Test an Axum router without opening a port: build a Request, call oneshot, read the body and assert on status and JSON. Includes the setup for shared state.
8 min read
Testing
Property Based Testing in Rust With Proptest Step by Step
Instead of picking inputs, state a property and let proptest generate hundreds. See round trip and invariant properties, shrinking to a minimal failure and a bug it finds.
3 min read
WebGuide
Axum Integration Tests With a Real Database in Docker
Test an Axum API against a real Postgres started by Testcontainers: one container per test binary, one migrated database per test, the leaks and version traps that bite, and measured timings for each isolation strategy.
18 min read
Testing
Assertions in Rust Assert Eq Matches and Custom Messages
assert, assert_eq, assert_ne, matches and debug_assert, with custom failure messages, float comparison, and what each prints. Includes a helper for readable domain assertions.
3 min read
Testing
Doc Tests in Rust and Keeping Examples Honest Step by Step
Code blocks in doc comments compile and run as tests. Write examples that stay correct, hide setup lines with a hash, mark intentional failures and choose the right attributes.
2 min read
Feature Flags That Break Builds and How to Test Them All
Feature flags multiply build configurations. See the combinations that fail, how cargo hack tests them, and rules for additive features that keep builds safe.
6 min read
Testing
Integration Tests in Rust and the Tests Directory Explained
Files in the tests directory are separate crates that use your library like any outside user. Learn the layout, shared helpers without duplicate test binaries and testing a binary crate.
3 min read
Testing
Unit Tests in Rust and Where the Test Module Lives
Put unit tests in a cfg(test) module at the bottom of the file they test. See how the test harness discovers them, the access to private items and naming conventions that read well.
3 min read
DevOps
Continuous Integration for Rust With GitHub Actions
A GitHub Actions workflow for Rust that formats, lints, tests and builds, with a pinned toolchain, dependency caching, a matrix and the failure modes to avoid.
3 min read
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