tests: Enable isolation of KeyChain during run of unit/integrated tests

Change-Id: Ia136e4bb074c14e8d824f563594cbc0ad7592c3b
Refs: #3655
diff --git a/tests/wscript b/tests/wscript
index 89a06cc..ad31f19 100644
--- a/tests/wscript
+++ b/tests/wscript
@@ -16,7 +16,7 @@
     # core modules that can be shared between unit and integrated tests
     bld(features="cxx",
         target="boost-tests-base",
-        source="identity-management-fixture.cpp",
+        source="key-chain-fixture.cpp identity-management-fixture.cpp",
         use='ndn-cxx tests-base BOOST',
         includes='.',
         install_path=None)