Update test fixtures to use explicit run

Change-Id: I3060a2bf57cef10a5a7ec5299e3491f1f6751221
diff --git a/tests/fixtures/layouts/timer-smtp.yaml b/tests/fixtures/layouts/timer-smtp.yaml
index a27b183..d9e4282 100644
--- a/tests/fixtures/layouts/timer-smtp.yaml
+++ b/tests/fixtures/layouts/timer-smtp.yaml
@@ -13,14 +13,17 @@
 - job:
     name: base
     parent: null
+    run: playbooks/base.yaml
 
 - job:
     name: project-bitrot-stable-old
     success-url: http://logs.example.com/{job.name}/{build.number}
+    run: playbooks/project-bitrot-stable-old.yaml
 
 - job:
     name: project-bitrot-stable-older
     success-url: http://logs.example.com/{job.name}/{build.number}
+    run: playbooks/project-bitrot-stable-older.yaml
 
 - project:
     name: org/project