Nimble is a matcher framework for expressing expected outcomes in Swift and Objective-C tests. Inspired by Cedar, it provides a fluent syntax for writing assertions that read naturally as expectations about code behavior.
The tool solves the problem of writing verbose, hard-to-read test assertions by offering matcher functions and operator overloads that let developers express test expectations in a declarative style. Rather than relying on basic equality checks, Nimble allows you to compose readable matchers that describe what you expect to happen, including support for asynchronous expectations where you need to wait for conditions to be met.
Nimble works best for teams already using or considering the Quick testing framework, its sister project, though it can be used independently. It suits any Swift or Objective-C project where test readability matters. The tool supports multiple installation methods: Swift Package Manager, CocoaPods, Carthage, and git submodules, giving flexibility across different project setups. One constraint to note is that the `raiseException` feature is unavailable when installing via Swift Package Manager.
The project maintains active development with regular updates to its documentation, which is organized as a Documentation Catalog for easy browsing. The codebase shows consistent attention to test infrastructure and API design, with thoughtful handling of edge cases in matcher implementations. Development activity reflects a focus on stability and compatibility across Apple platforms, with careful consideration given to how installation method choices affect available functionality.
