cmake: Catch 2 for testing

CMakeLists.txt

@@ -86,6 +86,8 @@ else()
 	set(CMAKE_INSTALL_RPATH "${SP_DIR};${EMAN_PREFIX_LIB}")
 endif()
 
+option(ENABLE_CATCH2 "Enable Catch 2 framework for unit testing (internal development only)" OFF)
+
 OPTION(ENABLE_AUTODOC "enable latex/doxygen document generation and etc. " OFF)
 
 OPTION(ENABLE_FFTW3 "enable fftw 3 support (USE THIS)" ON)

rt/imageio/CMakeLists.txt

@@ -7,11 +7,24 @@ add_custom_target(test-eer
         DEPENDS test_eer
         )
 
-add_executable(test_renderer test_renderer.cpp)
-target_link_libraries(test_renderer PRIVATE EM2)
-add_test(test-renderer test_renderer)
+if (ENABLE_CATCH2)
+    Include(FetchContent)
 
-add_custom_target(test-renderer
-        COMMAND ${CMAKE_CTEST_COMMAND} -V -C Release -R test-renderer
-        DEPENDS test_renderer
-        )
+    FetchContent_Declare(
+            Catch2
+            GIT_REPOSITORY https://github.com/catchorg/Catch2.git
+            GIT_TAG        v3.0.1 # or a later release
+    )
+
+    FetchContent_MakeAvailable(Catch2)
+
+
+    add_executable(test_renderer test_renderer.cpp)
+    target_link_libraries(test_renderer PRIVATE EM2 Catch2::Catch2WithMain)
+    add_test(test-renderer test_renderer)
+
+    add_custom_target(test-renderer
+            COMMAND ${CMAKE_CTEST_COMMAND} -V --output-on-failure -C Release -R test-renderer
+            DEPENDS test_renderer
+            )
+endif ()

rt/imageio/test_renderer.cpp

@@ -2,12 +2,7 @@
 
 using namespace EMAN;
 
+#include <catch2/catch_test_macros.hpp>
 
-#undef NDEBUG
-#include <cassert>
-
-
-int main()
-{
-	return 0;
+TEST_CASE("test class Renderer") {
 }