frugally-deep: Building the unit tests(doctest.h) error

I’ve done the following commands as described in README.

# install doctest
wget https://raw.githubusercontent.com/onqtam/doctest/master/doctest/doctest.h
sudo mv ./doctest.h /usr/local/include/doctest.h

# build unit tests
cmake -DFDEEP_BUILD_UNITTEST=ON ..

But an error occurred that did not find hunter_add_package(doctest).

$ cmake -DFDEEP_BUILD_UNITTEST=ON ..
-- ===( frugally-deep 0.2.3 )===
-- Building Unit Tests
CMake Error at test/CMakeLists.txt:52 (find_package):
  Could not find a package configuration file provided by "doctest" with any
  of the following names:

    doctestConfig.cmake
    doctest-config.cmake

  Add the installation prefix of "doctest" to CMAKE_PREFIX_PATH or set
  "doctest_DIR" to a directory containing one of the above files.  If
  "doctest" provides a separate development package or SDK, be sure it has
  been installed.


-- Configuring incomplete, errors occurred!
See also "/Users/kaonpark/workspace/github.com/Dobiasd/frugally-deep/build/CMakeFiles/CMakeOutput.log".

I’d like to perform unit tests. can I get help?

Thanks.