Travis CI: Add bazel tests to verification

Change-Id: Ifc3db5a2ce9abdf55622d89d556e2ed0d129897e
diff --git a/.travis.yml b/.travis.yml
index 629bdf8..3209482 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -43,6 +43,7 @@
 script:
   - |
     bazel build --verbose_failures :all
+    bazel test --test_output=errors :oauth_tests
 
 notifications:
   email: false