diff --git a/package_manager/tests/fixtures/fake_site/sites/default/services.yml b/package_manager/tests/fixtures/fake_site/sites/default/services.yml
index e11552b41d40377475700ab10cd3118257d93cc7..cbc4434e8f2bc888569a704746bf41606174d259 100644
--- a/package_manager/tests/fixtures/fake_site/sites/default/services.yml
+++ b/package_manager/tests/fixtures/fake_site/sites/default/services.yml
@@ -1 +1,2 @@
 # This file should never be staged.
+must_not_be: 'empty'
diff --git a/package_manager/tests/fixtures/fake_site/sites/example.com/services.yml b/package_manager/tests/fixtures/fake_site/sites/example.com/services.yml
index e11552b41d40377475700ab10cd3118257d93cc7..f408d89e28e978d7e5cc3605b5e35eb81d122e3b 100644
--- a/package_manager/tests/fixtures/fake_site/sites/example.com/services.yml
+++ b/package_manager/tests/fixtures/fake_site/sites/example.com/services.yml
@@ -1 +1,2 @@
 # This file should never be staged.
+key: "value"