add test for command bash-completion

Change-Id: Ic9f02e05f8f99a30adf40266417ee4288765d7dc
Closes-bug: #1319294
diff --git a/tempest/cli/simple_read_only/test_heat.py b/tempest/cli/simple_read_only/test_heat.py
index cf4580c..7a952fc 100644
--- a/tempest/cli/simple_read_only/test_heat.py
+++ b/tempest/cli/simple_read_only/test_heat.py
@@ -85,6 +85,9 @@
     def test_heat_help(self):
         self.heat('help')
 
+    def test_heat_bash_completion(self):
+        self.heat('bash-completion')
+
     def test_heat_help_cmd(self):
         # Check requesting help for a specific command works
         help_text = self.heat('help resource-template')