Add test case for projects with one job.

This situation exposed a problem where tests for the second change
would not be run if the change in front of it had one job marked
hold and succeeded.

Change-Id: I8f3c3bdb9d3631efc8b207a61d5a9086808cafb4
Reviewed-on: https://review.openstack.org/11818
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins
diff --git a/tests/fixtures/layout.yaml b/tests/fixtures/layout.yaml
index 35eb737..4082b39 100644
--- a/tests/fixtures/layout.yaml
+++ b/tests/fixtures/layout.yaml
@@ -81,3 +81,11 @@
         - project1-project2-integration
     post:
       - project2-post
+
+  - name: org/one-job-project
+    check:
+      - one-job-project-merge
+    gate:
+      - one-job-project-merge
+    post:
+      - one-job-project-post