Why do we need yet another C++ test framework?
Good question. For C++ there are quite a number of established frameworks, including (but not limited to), CppUnit, Google Test, Boost.Test, Aeryn, Cute, Fructose and many, many more. Even for Objective-C there are a few, including OCUnit - which now comes bundled with XCode.
So what does Catch bring to the party that differentiates it from these? Apart from a Catchy name, of course.
- Really easy to get started. Just download catch.hpp, #include it and you're away.
- No external dependencies. As long as you can compile C++98 and have a C++ standard library available.
- Write test cases as, self-registering, functions or methods.
- Divide test cases into sections, each of which is run in isolation (eliminates the need for fixtures!)
- Use BDD-style Given-When-Then sections as well as traditional unit test cases.
- Only one core assertion macro for comparisons. Standard C/C++ operators are used for the comparison - yet the full expression is decomposed and lhs and rhs values are logged.
Other core features
- Tests are named using free-form strings - no more couching names in legal identifiers.
- Tests can be tagged for easily running ad-hoc groups of tests.
- Failures can (optionally) break into the debugger on Windows and Mac.
- Output is through modular reporter objects. Basic textual and XML reporters are included. Custom reporters can easily be added.
- JUnit xml output is supported for integration with third-party tools, such as CI servers.
- A default main() function is provided (in a header), but you can supply your own for complete control (e.g. integration into your own test runner GUI).
- A command line parser is provided and can still be used if you choose to provided your own main() function.
- Catch can test itself.
- Alternative assertion macro(s) report failures but don't abort the test case
- Floating point tolerance comparisons are built in using an expressive Approx() syntax.
- Internal and friendly macros are isolated so name clashes can be managed
- Support for Matchers (early stages)
- Automatically detects if you are using it from an Objective-C project
- Works with and without ARC with no additional configuration
- Implement test fixtures using Obj-C classes too (like OCUnit)
- Additional built in matchers that work with Obj-C types (e.g. string matchers)
Who else is using Catch?
See the list of open source projects using Catch.
See the tutorial to get more of a taste of using CATCH in practice