UnitTesting » History » Revision 3
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# Unit Testing
NFD requires unit testing for most modules.
NFD uses [Boost Unit Test Framework](http://www.boost.org/doc/libs/1_48_0/libs/test/doc/html/index.html).
## Learning Resources for Boost Unit Test Framework
* [Boost Unit Test Framework documentation](http://www.boost.org/doc/libs/1_48_0/libs/test/doc/html/index.html)
* After compiling the unit-test binary, it is possible at run time to select which tests to run and what kind of output is desired.
Use `--help` command line option to get more information about the available options.
## Testing Code Guidelines
* Test suites should be defined inside `nfd::tests` namespace.
* Test suites should use `nfd::tests::BaseFixture` fixture, to get automatic setup and teardown of global `io_service`.
* If a custom fixture is defined for test case or test case, that custom fixture should derive from `BaseFixture`.
## Testing Helpers
* `tests/core/limited-io.hpp` provides operation count and time limit
* `tests/face/dummy-face.hpp` provides a `Face` that doesn't depend on a socket
* `tests/fw/strategy-tester.hpp` provides a facade to test a forwarding strategy