Update eigen installation test

Tests/CMakeLists.txt

@@ -11,7 +11,7 @@ function(add_autopybind11_test name)
     "-DAutoPyBind11_DIR=${AutoPyBind11_DIR}"
     "-DCastXML_EXECUTABLE=${CastXML_EXECUTABLE}"
     "-DPYTHON_EXECUTABLE=${PYTHON_EXECUTABLE}"
-    "-DEigen_INCLUDE_DIR=${Eigen_INCLUDE_DIR}"
+
     --test-command ${PYTHON_EXECUTABLE}
     ${CMAKE_CURRENT_SOURCE_DIR}/${name}/${name}.py
     )
@@ -26,7 +26,17 @@ function(add_autopybind11_failing_test name)
 endfunction(add_autopybind11_failing_test)
 
 if(Eigen_INCLUDE_DIR)
-  add_autopybind11_test(eigen)
+  add_test(NAME Eigen-Dependency COMMAND "${CMAKE_CTEST_COMMAND}"
+  --build-and-test
+  ${CMAKE_CURRENT_BINARY_DIR}/eigen
+  ${CMAKE_CURRENT_BINARY_DIR}/eigen
+  --build-two-config
+  --build-run-dir ${CMAKE_CURRENT_BINARY_DIR}/eigen
+  --build-generator ${CMAKE_GENERATOR}
+  --build-project eigen
+  --build-options "-DEigen_INCLUDE_DIR=${Eigen_INCLUDE_DIR}"
+  --test-command "${CMAKE_CTEST_COMMAND}"
+)
 endif()
 
 add_autopybind11_test(simple)

Tests/eigen/CMakeLists.txt

 cmake_minimum_required(VERSION 3.15)
-project(APB-EIGEN CXX)
+project(eigen CXX)
+enable_testing()
 
 add_executable(eigen-test eigen_test.cpp)
-target_include_directories(eigen-test INTERFACE ${Eigen_INCLUDE_DIR} )
+target_include_directories(eigen-test PRIVATE ${Eigen_INCLUDE_DIR} )
+
+add_test(NAME Eigen-Dependency-Test COMMAND eigen-test)