Fix test package

test_package/CMakeLists.txt

 project(PackageTest CXX)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.8)
 
 include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
 conan_basic_setup(TARGETS)
 
-find_package(PythonLibs REQUIRED)
-
-add_library(test_package MODULE test_package.cpp)
-target_include_directories(test_package PRIVATE ${PYTHON_INCLUDE_DIRS})
-target_link_libraries(test_package PRIVATE CONAN_PKG::pybind11 ${PYTHON_LIBRARIES})
-target_compile_features(test_package PRIVATE cxx_std_17)
-# set_target_properties(test_package PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}"
-#                                               SUFFIX "${PYTHON_MODULE_EXTENSION}")
+find_package(pybind11 REQUIRED)
 
 enable_testing()
-add_test(NAME test_package_py
-         WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/bin
-         COMMAND $(PYTHON_PREFIX) test_package.py)
\ No newline at end of file
+pybind11_add_module(test_package MODULE test_package.cpp)

test_package/conanfile.py

 import os
+import sys
 
 from conans import ConanFile, CMake, tools
 
 
-class BenchmarkTestConan(ConanFile):
+class Pybind11TestConan(ConanFile):
     settings = "os", "compiler", "build_type", "arch"
     generators = "cmake"
 
@@ -20,5 +21,8 @@ class BenchmarkTestConan(ConanFile):
     def test(self):
         if not tools.cross_building(self.settings):
             os.chdir("lib")
-            self.run("python3 ..%s..%s..%stest_package.py" %
-                     (os.sep, os.sep, os.sep))
+            sys.path.append(".")
+
+            import test_package
+            assert test_package.add(1, 2) == 3
+            assert test_package.subtract(2, 1) == 1

test_package/test_package.py

-import unittest
-
-
-class TestPackage(unittest.TestCase):
-    def test_add(self):
-        import test_package
-        print(test_package.__doc__)
-
-        self.assertEqual(test_package.add(1, 2), 3)
-
-    def test_substract(self):
-        import test_package
-
-        self.assertEqual(test_package.substract(2, 1), 1)
-
-
-if __name__ == "__main__":
-    unittest.main()