Unit tests now under CTest control

Compilation no longer enforces unit test runs

CHANGELOG

 BornAgain-1.17.99, work in progress
 
+  > Internal refactoring:
+    1) Unit tests now under CTest control, no longer enforced during compilation
+
 BornAgain-1.17.0, released 2020.06.16
   > API changes:
     1) Add Nevot-Croce roughness model.

Tests/UnitTests/Core/CMakeLists.txt

-############################################################################
-# Core unit tests
-############################################################################
+include(GoogleTest)
+
 set(test UnitTestCore)
 
 include_directories(${CMAKE_SOURCE_DIR}/Tests/UnitTests/utilities)
@@ -11,5 +10,4 @@ file(GLOB include_files "*/*.h")
 add_executable(${test} ${source_files} ${include_files})
 target_link_libraries(${test} ${BornAgainCore_LIBRARY} gtest)
 
-# add execution of TestCore just after compilation
-add_custom_target(${test}_run ALL DEPENDS ${test} COMMAND ${test})
+gtest_discover_tests(${test} TEST_PREFIX Core:Unit:)

Tests/UnitTests/Fit/CMakeLists.txt

-############################################################################
-# Fit unit tests
-############################################################################
+include(GoogleTest)
 
 set(test UnitTestFit)
 
@@ -12,5 +10,4 @@ file(GLOB include_files "*.h")
 add_executable(${test} ${source_files} ${include_files})
 target_link_libraries(${test} ${BornAgainFit_LIBRARY} gtest)
 
-# add execution of TestCore just after compilation
-add_custom_target(${test}_run ALL DEPENDS ${test} COMMAND ${test})
+gtest_discover_tests(${test} TEST_PREFIX Fit:Unit:)

Tests/UnitTests/GUI/CMakeLists.txt

-############################################################################
-# GUI unit tests
-############################################################################
+include(GoogleTest)
 
 set(test UnitTestGUI)
 
@@ -17,5 +15,4 @@ add_executable(${test} ${source_files} ${include_files})
 target_link_libraries(${test} ${BornAgainGUI_LIBRARY} gtest)
 target_link_libraries(${test} Qt5::Core Qt5::Test)
 
-# add execution of TestCore just after compilation
-add_custom_target(${test}_run ALL DEPENDS ${test} COMMAND ${test})
+gtest_discover_tests(${test} TEST_PREFIX GUI:Unit:)

Tests/UnitTests/Numeric/CMakeLists.txt

-############################################################################
-# Core unit tests
-############################################################################
+include(GoogleTest)
+
 set(test UnitTestNumeric)
 
 if(MSVC)
@@ -18,6 +17,4 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     target_compile_options(${test} PUBLIC "-Wno-deprecated-copy")
 endif()
 
-# Registering in ctest section
-add_test(${test} ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${test})
-set_tests_properties(${test} PROPERTIES LABELS "Fullcheck")
+gtest_discover_tests(${test} TEST_PREFIX Numeric:)