David Drysdale af3ee9a8ba test: Add initial unit tests for c-ares library ...

The tests are written in C++11, using the GoogleTest and GoogleMock
frameworks.  They have their own independent autoconf setup, so that
users of the library need not have a C++ compiler just to get c-ares
working (however, the test/configure.ac file does assume the use of
a shared top-level m4/ directory).  However, this autoconf setup has
only been tested on Linux and OSX so far.

Run with "./arestest", or "./arestest -v" to see extra debug info.
The GoogleTest options for running specific tests are also
available (e.g. "./arestest --gtest_filter=*Live*").

The tests are nowhere near complete yet (currently hitting around
60% coverage as reported by gcov), but they do include examples
of a few different styles of testing:

 - There are live tests (ares-test-live.cc), which assume that the
   current machine has a valid DNS setup and connection to the
   internet; these tests issue queries for real domains but don't
   particularly check what gets returned.  The tests will fail on
   an offline machine.

 - There a few mock tests (ares-test-mock.cc) that set up a fake DNS
   server and inject its port into the c-ares library configuration.
   These tests allow specific response messages to be crafted and
   injected, and so are likely to be used for many more tests in
   future.

    - To make this generation/injection easier, the dns-proto.h file
      includes C++ helper classes for building DNS packets.

 - Other library entrypoints that don't require network activity
   (e.g. ares_parse_*_reply) are tested directly.

 - There are few tests of library-internal functions that are not
   normally visible to API users (in ares-test-internal.cc).

 - A couple of the tests use a helper method of the test fixture to
   inject memory allocation failures, using the earlier change to the
   library to allow override of malloc/realloc/free.

 - There is also an entrypoint to allow Clang's libfuzzer to drive
   the packet parsing code in ares_parse_*_reply, together with a
   standalone wrapper for it (./aresfuzz) to allow use of afl-fuzz
   for further fuzz testing.

2016-02-02 10:13:46 +00:00

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test: Add initial unit tests for c-ares library

2016-02-02 10:13:46 +00:00

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test: Add initial unit tests for c-ares library

2016-02-02 10:13:46 +00:00