fixup: tests for optional deps.

cmake/HighFiveOptionalDependencies.cmake

@@ -11,7 +11,7 @@ endif()
 
 if(NOT TARGET HighFiveEigenDependency)
   add_library(HighFiveEigenDependency INTERFACE)
-  if(HIGHFIVE_TEST_EIGEN AND NOT TARGET HighFiveEigenDependency)
+  if(HIGHFIVE_TEST_EIGEN)
     find_package(Eigen3 REQUIRED NO_MODULE)
     target_link_libraries(HighFiveEigenDependency INTERFACE Eigen3::Eigen)
     target_compile_definitions(HighFiveEigenDependency INTERFACE HIGHFIVE_TEST_EIGEN=1)
@@ -20,7 +20,7 @@ endif()
 
 if(NOT TARGET HighFiveXTensorDependency)
   add_library(HighFiveXTensorDependency INTERFACE)
-  if(HIGHFIVE_TEST_XTENSOR AND NOT TARGET HighFiveXTensorDependency)
+  if(HIGHFIVE_TEST_XTENSOR)
     find_package(xtensor REQUIRED)
     target_link_libraries(HighFiveXTensorDependency INTERFACE xtensor)
     target_compile_definitions(HighFiveXTensorDependency INTERFACE HIGHFIVE_TEST_XTENSOR=1)
@@ -29,7 +29,7 @@ endif()
 
 if(NOT TARGET HighFiveOpenCVDependency)
   add_library(HighFiveOpenCVDependency INTERFACE)
-  if(HIGHFIVE_TEST_OPENCV AND NOT TARGET HighFiveOpenCVDependency)
+  if(HIGHFIVE_TEST_OPENCV)
     find_package(OpenCV REQUIRED)
     target_include_directories(HighFiveOpenCVDependency SYSTEM INTERFACE ${OpenCV_INCLUDE_DIRS})
     target_link_libraries(HighFiveOpenCVDependency INTERFACE ${OpenCV_LIBS})

tests/unit/tests_high_five_easy.cpp

@@ -20,13 +20,19 @@
 
 #include <stdio.h>
 
-#include <highfive/H5Easy.hpp>
 
 #ifdef HIGHFIVE_TEST_XTENSOR
 #include <xtensor/xrandom.hpp>
 #include <xtensor/xview.hpp>
 #endif
 
+#ifdef HIGHFIVE_TEST_EIGEN
+#include <Eigen/Dense>
+#endif
+
+
+#include <highfive/H5Easy.hpp>
+
 #include <catch2/catch_test_macros.hpp>
 
 TEST_CASE("H5Easy_Compression") {