I've run into a bit of a snag on the unit test front because make check doesn't show as a valid target, even though I've run download-gtest.sh and re-run cmake.

cmake complains that:

-- Could NOT find GTest (missing: GTEST_INCLUDE_DIR GTEST_MAIN_LIBRARY)
CMake Warning at CMakeLists.txt:187 (message):
  No gtest found! Disabling testing...

I'm going to keep hacking at this, but would love any advice and/or to discuss the PR in the meantime.

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