The 'test' target rebuilds somethig even though the project was already built

[yurivict]

See the log below.

'test' should only test when the build was done previously.

Please add to the README what is the proper command line to test it.

===>  Testing for py37-zstandard-0.15.1_1
===>   py37-zstandard-0.15.1_1 depends on file: /usr/local/bin/python3.7 - found
generating build/zstandard/_cffi.c
(already up-to-date)
not modified: 'build/zstandard/_cffi.c'
running test
WARNING: Testing via this command is deprecated and will be removed in a future version. Users looking for a generic test entry point independent of test runner are encouraged to use tox.
running egg_info
writing zstandard.egg-info/PKG-INFO
writing dependency_links to zstandard.egg-info/dependency_links.txt
writing requirements to zstandard.egg-info/requires.txt
writing top-level names to zstandard.egg-info/top_level.txt
reading manifest file 'zstandard.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'zstandard.egg-info/SOURCES.txt'
running build_ext
building 'zstandard.backend_c' extension
cc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -O2 -pipe -fstack-protector-strong -fno-strict-aliasing -O2 -pipe -fno-omit-frame-pointer -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing -fno-omit-frame-pointer -isystem /usr/local/include -fPIC -Ic-ext -Izstd -I/usr/local/include/python3.7m -c c-ext/backend_c.c -o build/temp.freebsd-12.2-STABLE-amd64-3.7/c-ext/backend_c.o -DZSTD_SINGLE_FILE -DZSTDLIB_VISIBILITY= -DZDICTLIB_VISIBILITY= -DZSTDERRORLIB_VISIBILITY= -fvisibility=hidden
cc -shared -fstack-protector-strong -O2 -pipe -fno-omit-frame-pointer -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing -fno-omit-frame-pointer -isystem /usr/local/include build/temp.freebsd-12.2-STABLE-amd64-3.7/c-ext/backend_c.o -L/usr/local/lib -lpython3.7m -o /usr/ports/archivers/py-zstandard/work-py37/zstandard-0.15.1/zstandard/backend_c.so
building 'zstandard._cffi' extension
cc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -O2 -pipe -fstack-protector-strong -fno-strict-aliasing -O2 -pipe -fno-omit-frame-pointer -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing -fno-omit-frame-pointer -isystem /usr/local/include -fPIC -I/usr/ports/archivers/py-zstandard/work-py37/zstandard-0.15.1/zstd -I/usr/ports/archivers/py-zstandard/work-py37/zstandard-0.15.1/zstd/dictBuilder -I/usr/local/include/python3.7m -c build/zstandard/_cffi.c -o build/temp.freebsd-12.2-STABLE-amd64-3.7/build/zstandard/_cffi.o
cc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -O2 -pipe -fstack-protector-strong -fno-strict-aliasing -O2 -pipe -fno-omit-frame-pointer -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing -fno-omit-frame-pointer -isystem /usr/local/include -fPIC -I/usr/ports/archivers/py-zstandard/work-py37/zstandard-0.15.1/zstd -I/usr/ports/archivers/py-zstandard/work-py37/zstandard-0.15.1/zstd/dictBuilder -I/usr/local/include/python3.7m -c zstd/zstdlib.c -o build/temp.freebsd-12.2-STABLE-amd64-3.7/zstd/zstdlib.o
cc -shared -fstack-protector-strong -O2 -pipe -fno-omit-frame-pointer -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing -fno-omit-frame-pointer -isystem /usr/local/include build/temp.freebsd-12.2-STABLE-amd64-3.7/build/zstandard/_cffi.o build/temp.freebsd-12.2-STABLE-amd64-3.7/zstd/zstdlib.o -L/usr/local/lib -lpython3.7m -o /usr/ports/archivers/py-zstandard/work-py37/zstandard-0.15.1/zstandard/_cffi.so
test_arguments (tests.test_buffer_util.TestBufferWithSegments) ... ok
test_invalid_getitem (tests.test_buffer_util.TestBufferWithSegments) ... ok
test_invalid_offset (tests.test_buffer_util.TestBufferWithSegments) ... ok