Add test_downstream

# }}}

# {{{ test_downstream

function test_downstream()

{

  local downstream_proj="$1"

  local proj_name="$downstream_proj"

  local test_examples=0

  if [[ "$downstream_proj" = *_examples ]]; then

    proj_name="${downstream_proj%_examples}"

    test_examples=1

  fi

  if [[ "$proj_name" = "mirgecom" ]]; then

      git clone "https://github.com/illinois-ceesd/$proj_name.git"

  else

      git clone "https://github.com/inducer/$proj_name.git"

  fi

  cd "$PROJ_DIR"

  echo "*** $proj_name version: $(git rev-parse --short HEAD)"

  transfer_requirements_git_urls ../requirements.txt ./requirements.txt

  edit_requirements_txt_for_downstream_in_subdir

  # Avoid slow or complicated tests in downstream projects

  export PYTEST_ADDOPTS="-k 'not (slowtest or octave or mpi)'"

  if [[ "$proj_name" = "mirgecom" ]]; then

      # can't turn off MPI in mirgecom

      export CONDA_ENVIRONMENT=conda-env.yml

      export CISUPPORT_PARALLEL_PYTEST=no

      echo "- mpi4py" >> "$CONDA_ENVIRONMENT"

  else

      sed -i "/mpi4py/ d" requirements.txt

  fi

  build_py_project_in_conda_env

  if [[ "$test_examples" == "0" ]]; then

    test_py_project

  else

    if [[ "$proj_name" = "mirgecom" ]]; then

      examples/run_examples.sh ./examples

    else

      run_examples

    fi

  fi

}

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