Add core/extensions test cases

test/unit/ts_unit.rb

@@ -16,6 +16,7 @@ require './core/tc_core'
 require './core/tc_api'
 require './core/tc_bootstrap'
 require './core/tc_modules'
+require './core/tc_extensions'
 require './core/tc_social_engineering'
 require './core/tc_autorun'
 require './core/tc_obfuscation'
@@ -44,6 +45,7 @@ class TS_BeefTests
     suite << TC_Bootstrap.suite
     suite << TC_Api.suite
     suite << TC_Modules.suite
+    suite << TC_Extensions.suite
     suite << TC_Filesystem.suite
     suite << TC_Grep.suite
     suite << TC_SocialEngineering.suite