add fix for failing bootstrapping test due to OS-specific random generator

as mentioned in https://github.com/xtensor-stack/xtensor/issues/2629,
the behaviour of the random generator is controlled by the implementation
of the standard library, so it cannot be expected to behave the same
across platforms

tests/CMakeLists.txt

@@ -8,6 +8,18 @@ find_package(GTest REQUIRED)
 # ------------------------------------------------------------------------------
 # build
 # ------------------------------------------------------------------------------
+OPTION(EVALHYD_TESTING_OS "OS system used to run tests")
+
+if(CMAKE_HOST_APPLE)
+    set(EVALHYD_TESTING_OS "MACOS")
+elseif(CMAKE_HOST_WIN32)
+    set(EVALHYD_TESTING_OS "WINDOWS")
+elseif(CMAKE_HOST_UNIX)
+    set(EVALHYD_TESTING_OS "LINUX")
+else()
+    message(SEND_ERROR "OS not supported to run tests")
+endif()
+
 add_executable(
         evalhyd_tests
         test_determinist.cpp