Add a unit test.

This also changes the Jenkinsfile so the tests run on Jenkins.

Change-Id: Ib7fbc226e81a574e7068f5d1eba8491cdb523f17
diff --git a/.gitignore b/.gitignore
index a468ad2..1bbd63d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 hello-world-ng
+t/greeting-test
 *~
 *.o
+/test-results
\ No newline at end of file