Testcontainers Blur the Lines Between Unit and Integration Tests
· 4 min read
About This Blog
This blog documents learnings from building Angzarr—a polyglot event sourcing framework. The framework core is written in Rust, so examples here are primarily Rust.
Angzarr doesn't require Rust. Client SDKs exist for Go, Python, Java, C#, and C++. The author—a polyglot developer—doesn't believe Rust is the best language for everything. It is the right choice for this framework's core, and building it has produced these learnings.
The Rust should be readable by most programmers. If you have questions: consult The Rust Book, ask an LLM, or email the author.
The old unit/integration distinction assumed "integration" meant "slow, fragile, needs environment setup." Testcontainers changed the economics.