add test instance factory for the base, named, and hook managers

The class method make_test_instance constructs manager instances using a
predefined list of extensions, rather than loading from entry points.

1 files changed, 24 insertions, 0 deletions

diff --git a/stevedore/hook.py b/stevedore/hook.py
index c1cec7f..29f845a 100644
--- a/stevedore/hook.py
+++ b/stevedore/hook.py
@@ -32,6 +32,30 @@ class HookManager(NamedExtensionManager):
             invoke_kwds=invoke_kwds,
         )
 
+    @classmethod
+    def make_test_instance(cls, available_extensions, name):
+        """Construct a test HookManager
+
+        Test instances are passed a list of extensions to work from rather
+        than loading them from entry points, filtering the available
+        extensions to only those extensions whose name matches the name
+        argument.
+
+        :param available_extensions: Pre-configured Extension instances
+            available for use
+        :type available_extensions: list of
+            :class:`~stevedore.extension.Extension`
+        :param name: The name of the hooks to use.
+        :type name: str
+        :return: The manager instance, initialized for testing
+
+        """
+
+        o = super(HookManager, cls).make_test_instance(available_extensions,
+                                                       [name])
+        o._name = name
+        return o
+
     def __getitem__(self, name):
         """Return the named extensions.