ReddRadar
Agent skill
testing
Comprehensive testing strategies for Guts including unit tests, integration tests, property-based testing, and fuzzing
Install this agent skill to your Project
npx add-skill https://github.com/aiskillstore/marketplace/tree/main/skills/abdelstark/testing
SKILL.md
Testing Skill for Guts
You are writing tests for a distributed system that requires high reliability.
Testing Pyramid
/\
/ \ E2E Tests (few)
/ \ Integration Tests (some)
/ \ Unit Tests (many)
/________\ Property Tests (extensive)
Unit Testing
Structure
#[cfg(test)]
mod tests {
use super::*;
use pretty_assertions::assert_eq;
// Group related tests
mod repository_tests {
use super::*;
#[test]
fn create_repository_success() {
let repo = Repository::new("test-repo");
assert_eq!(repo.name(), "test-repo");
}
#[test]
fn create_repository_invalid_name() {
let result = Repository::new("");
assert!(matches!(result, Err(RepositoryError::InvalidName(_))));
}
}
}
Async Tests
#[tokio::test]
async fn async_operation_completes() {
let service = TestService::new().await;
let result = tokio::time::timeout(
Duration::from_secs(5),
service.long_running_operation(),
)
.await;
assert!(result.is_ok());
}
Integration Testing
Test Fixtures
// tests/common/mod.rs
pub struct TestNode {
pub node: Node,
pub temp_dir: TempDir,
}
impl TestNode {
pub async fn new() -> Self {
let temp_dir = TempDir::new().unwrap();
let config = Config::test_default(temp_dir.path());
let node = Node::new(config).await.unwrap();
Self { node, temp_dir }
}
}
// tests/integration/repository_tests.rs
#[tokio::test]
async fn can_create_and_clone_repository() {
let node = TestNode::new().await;
// Create repository
let repo_id = node.create_repository("test").await.unwrap();
// Clone should succeed
let cloned = node.clone_repository(repo_id).await;
assert!(cloned.is_ok());
}
Multi-Node Tests
#[tokio::test]
async fn nodes_sync_repository() {
// Start 3 nodes
let nodes: Vec<_> = futures::future::join_all(
(0..3).map(|_| TestNode::new())
).await;
// Connect nodes
for i in 1..nodes.len() {
nodes[i].connect_to(&nodes[0]).await.unwrap();
}
// Create repo on node 0
let repo_id = nodes[0].create_repository("sync-test").await.unwrap();
// Wait for sync
tokio::time::sleep(Duration::from_secs(2)).await;
// Verify all nodes have the repo
for node in &nodes {
assert!(node.has_repository(repo_id).await);
}
}
Property-Based Testing
Using proptest:
use proptest::prelude::*;
proptest! {
#[test]
fn repository_name_roundtrip(name in "[a-z][a-z0-9-]{0,63}") {
let repo = Repository::new(&name).unwrap();
prop_assert_eq!(repo.name(), name);
}
#[test]
fn signature_verification(data in any::<Vec<u8>>()) {
let identity = Identity::new();
let signature = identity.sign(&data);
prop_assert!(identity.verify(&data, &signature).is_ok());
}
}
Fuzzing
Using cargo-fuzz:
// fuzz/fuzz_targets/parse_message.rs
#![no_main]
use libfuzzer_sys::fuzz_target;
use guts_protocol::Message;
fuzz_target!(|data: &[u8]| {
// Parsing should never panic
let _ = Message::parse(data);
});
Test Commands
# Run all tests
cargo test --workspace
# Run with coverage
cargo llvm-cov --workspace --html
# Run specific test
cargo test repository_tests::create_repository
# Run integration tests only
cargo test --test '*' --workspace
# Run benchmarks
cargo bench --workspace
# Run fuzzer
cargo +nightly fuzz run parse_message
CI Test Matrix
test:
strategy:
matrix:
os: [ubuntu-latest, macos-latest]
rust: [stable, beta, nightly]
steps:
- uses: actions/checkout@v4
- uses: dtolnay/rust-toolchain@master
with:
toolchain: ${{ matrix.rust }}
- run: cargo test --workspace --all-features
Mocking Dependencies
use mockall::automock;
#[automock]
pub trait Storage {
async fn get(&self, key: &[u8]) -> Result<Vec<u8>>;
async fn put(&self, key: &[u8], value: &[u8]) -> Result<()>;
}
#[tokio::test]
async fn service_uses_storage() {
let mut mock = MockStorage::new();
mock.expect_get()
.returning(|_| Ok(vec![1, 2, 3]));
let service = Service::new(Box::new(mock));
let result = service.fetch_data(b"key").await;
assert_eq!(result.unwrap(), vec![1, 2, 3]);
}
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