Added tests for Units

[SVN r46180]

status/Jamfile.v2

@@ -121,6 +121,7 @@ run-tests
     tuple/test                  # test-suite tuple
     type_traits/test            # test-suite type_traits
     typeof/test                 # test-suite typeof
+    units/test                  # test-suite units
     unordered/test/unordered    # test-suite unordered
     unordered/test/exception    # test-suite unordered-exception
     utility/enable_if/test      # test-suite utility/enable_if