tests: don't install unit-tests

refs #3312

Change-Id: I6e8a9a820356b178580a84284ce790ebff1b1964
diff --git a/tests/wscript b/tests/wscript
index e44f2a4..9515055 100644
--- a/tests/wscript
+++ b/tests/wscript
@@ -10,5 +10,6 @@
         source=bld.path.ant_glob(['*.cpp'] + ['%s/**/*.cpp' % tool for tool in bld.env['BUILD_TOOLS']]),
         use=['core-objects'] + ['%s-objects' % tool for tool in bld.env['BUILD_TOOLS']],
         headers='../common.hpp boost-test.hpp',
+        install_path=None,
         defines='TMP_TESTS_PATH=\"%s/tmp-tests\"' % bld.bldnode,
         )