Remove obsolete Python guard

The Python guard isn't necessary anymore because submodules are
now installed in the Python package espressomd, and the testsuite
itself already has a Python guard in the top-level CMakeLists.txt.

testsuite/cmake/CMakeLists.txt

@@ -11,15 +11,12 @@ function(CMAKE_TEST)
   set(cmake_tests ${cmake_tests} ${TEST_FILE} PARENT_SCOPE)
 endfunction(CMAKE_TEST)
 
-if(WITH_PYTHON AND PYTHONINTERP_FOUND)
-  # obtain Python*_SITEARCH without find_package(Python*)
-  execute_process(
-    COMMAND "${PYTHON_EXECUTABLE}" -c "from distutils import sysconfig as sc;print(sc.get_python_lib(prefix='', plat_specific=True, standard_lib=False))"
-    OUTPUT_VARIABLE Python_SITEARCH
-    OUTPUT_STRIP_TRAILING_WHITESPACE)
+execute_process(
+  COMMAND "${PYTHON_EXECUTABLE}" -c "from distutils import sysconfig as sc;print(sc.get_python_lib(prefix='${CMAKE_INSTALL_PREFIX}', plat_specific=True, standard_lib=False))"
+  OUTPUT_VARIABLE PYTHON_DIR
+  OUTPUT_STRIP_TRAILING_WHITESPACE)
 
-  cmake_test(FILE test_install.sh DEPENDENCIES BashUnitTests.sh)
-endif()
+cmake_test(FILE test_install.sh DEPENDENCIES BashUnitTests.sh)
 
 add_custom_target(setup_install COMMAND make install WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
 add_custom_target(check_cmake_install COMMAND ${CMAKE_CTEST_COMMAND} --timeout ${TEST_TIMEOUT} -C serial --output-on-failure)

testsuite/cmake/test_install.sh

@@ -21,20 +21,18 @@ source BashUnitTests.sh
 
 # test installation and Python bindings
 function test_install() {
-  local -r site_package_espressomd="$(realpath '@CMAKE_INSTALL_PREFIX@/@Python_SITEARCH@/espressomd')"
-
   # check Python files were installed in espressomd
   local -r filepaths=("@CMAKE_INSTALL_FULL_BINDIR@/pypresso" \
-                      "${site_package_espressomd}/EspressoCore.so" \
-                      "${site_package_espressomd}/_init.so" \
-                      "${site_package_espressomd}/__init__.py"
+                      "@PYTHON_DIR@/espressomd/EspressoCore.so" \
+                      "@PYTHON_DIR@/espressomd/_init.so" \
+                      "@PYTHON_DIR@/espressomd/__init__.py"
                      )
   for filepath in ${filepaths[@]}; do
     assert_file_exists "${filepath}"
   done
 
   # check no Python file was installed outside espressomd
-  paths=$(find "@CMAKE_INSTALL_PREFIX@" -path "${site_package_espressomd}" -prune -o \( -name '*.py' -o -name '*.so' \) -print)
+  paths=$(find "@CMAKE_INSTALL_PREFIX@" -path "@PYTHON_DIR@/espressomd" -prune -o \( -name '*.py' -o -name '*.so' \) -print)
   count=$(echo "${paths}" | wc -l)
   assert_string_equal "${paths}" "" "${count} files were installed in the wrong directories:"$'\n'"${paths}"