diff --git a/tests/builddep.pp b/tests/builddep.pp
index c5a7a20..8b4f796 100644
--- a/tests/builddep.pp
+++ b/tests/builddep.pp
@@ -1,2 +1,2 @@
 class { 'apt': }
-apt::builddep{ 'foo': }
+apt::builddep{ 'glusterfs-server': }
diff --git a/tests/ppa.pp b/tests/ppa.pp
index 495866c..e728f6f 100644
--- a/tests/ppa.pp
+++ b/tests/ppa.pp
@@ -1,2 +1,4 @@
 class { 'apt': }
-apt::ppa{ 'foo': }
+
+# Example declaration of an Apt PPA
+apt::ppa{ 'ppa:openstack-ppa/bleeding-edge': }
diff --git a/tests/release.pp b/tests/release.pp
index 04be759..823f586 100644
--- a/tests/release.pp
+++ b/tests/release.pp
@@ -1,4 +1,4 @@
 class { 'apt': }
 class { 'apt::release':
-  release_id => 'foo'
+  release_id => 'karmic'
 }
diff --git a/tests/source.pp b/tests/source.pp
index 9ebcd52..d83cb97 100644
--- a/tests/source.pp
+++ b/tests/source.pp
@@ -2,6 +2,7 @@
 class { 'apt': }
 
 # Install the puppetlabs apt source
+# Release is automatically obtained from lsbdistcodename fact if available.
 apt::source { 'puppetlabs':
   location   => 'http://apt.puppetlabs.com',
   repos      => 'main',