feat: add module mp_units

test/unit_test/static/reference_test.cpp

@@ -21,6 +21,9 @@
 // SOFTWARE.
 
 #include "test_tools.h"
+#ifdef MP_UNITS_MODULES
+import mp_units;
+#else
 #include <mp-units/dimension.h>
 #include <mp-units/quantity.h>
 #include <mp-units/quantity_spec.h>
@@ -28,6 +31,7 @@
 #include <mp-units/system_reference.h>
 #include <mp-units/systems/si/prefixes.h>
 #include <mp-units/unit.h>
+#endif
 
 namespace {