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o Build features:
- Tor now builds each source file in two modes: a mode that avoids
exposing identifiers needlessly, and another mode that exposes
more identifiers for testing. This lets the compiler do better at
optimizing the production code, while enabling us to take more
radical measures to let the unit tests test things.
- The production builds no longer include functions used only
in the unit tests; all functions exposed from a module for
unit-testing only are now static in production builds.
- Add an --enable-coverage configuration option to make the unit
tests (and a new src/or/tor-cov target) to build with gcov test
coverage support.
o Testing:
- We now have rudimentary function mocking support that our unit
tests can use to test functions in isolation. Function mocking
lets the tests temporarily replace a function's dependencies with
stub functions, so that the tests can check the function without
invoking the other functions it calls.
- Add more unit tests for the <circid,channel>->circuit map, and
the destroy-cell-tracking code to fix bug 7912.
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