From: Pavel Sobolev <contact@paveloom.dev>
Subject: [PATCH] Make tests optional.

Signed-off-by: Pavel Sobolev <contact@paveloom.dev>

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,11 +22,13 @@ set(CMAKE_CXX_STANDARD_REQUIRED True)
 # - Intel (not regularly tested)
 # other compilers on a best effort
 
-add_subdirectory(Test/ClangTest)
-add_subdirectory(Test/GccTest)
-add_subdirectory(Test/MsvcTest)
+include(CTest)
 
-enable_testing()
+if (BUILD_TESTING)
+    add_subdirectory(Test/ClangTest)
+    add_subdirectory(Test/GccTest)
+    add_subdirectory(Test/MsvcTest)
+endif()
 
 add_library(SafeInt INTERFACE)
 target_include_directories(SafeInt INTERFACE .)