Added opencv_tests and opencv_perf_tests targets to simplify building tests only

cmake/OpenCVExtraTargets.cmake

@@ -50,4 +50,24 @@ if(BUILD_PERF_TESTS AND PYTHON_EXECUTABLE)
       DEPENDS "${OpenCV_SOURCE_DIR}/modules/ts/misc/run.py"
       )
   endif()
+  if(ENABLE_SOLUTION_FOLDERS)
+    set_target_properties(perf PROPERTIES FOLDER "tests performance")
+  endif()
 endif()
+
+#-----------------------------------
+# spefial targets to build all tests
+#-----------------------------------
+if(BUILD_TESTS)
+  add_custom_target(opencv_tests)
+  if(ENABLE_SOLUTION_FOLDERS)
+    set_target_properties(opencv_tests PROPERTIES FOLDER "tests accuracy")
+  endif()
+endif()
+if(BUILD_PERF_TESTS)
+  add_custom_target(opencv_perf_tests)
+  if(ENABLE_SOLUTION_FOLDERS)
+    set_target_properties(opencv_perf_tests PROPERTIES FOLDER "tests performance")
+  endif()
+endif()
+

cmake/OpenCVModule.cmake

@@ -541,6 +541,7 @@ macro(ocv_add_perf_tests)
 
       add_executable(${the_target} ${OPENCV_PERF_${the_module}_SOURCES})
       target_link_libraries(${the_target} ${OPENCV_MODULE_${the_module}_DEPS} ${perf_deps} ${OPENCV_LINKER_LIBS})
+      add_dependencies(opencv_perf_tests ${the_target})
 
       # Additional target properties
       set_target_properties(${the_target} PROPERTIES
@@ -591,6 +592,7 @@ macro(ocv_add_accuracy_tests)
     
       add_executable(${the_target} ${OPENCV_TEST_${the_module}_SOURCES})
       target_link_libraries(${the_target} ${OPENCV_MODULE_${the_module}_DEPS} ${test_deps} ${OPENCV_LINKER_LIBS})
+      add_dependencies(opencv_tests ${the_target})
 
       # Additional target properties
       set_target_properties(${the_target} PROPERTIES