Add test for hook_libraries (#1185)

* Add test for hook_libraries

Author: ashwoods

tests/breadcrumbs/tests.py

@@ -9,6 +9,11 @@
 from io import StringIO
 
 
+class DummyClass(object):
+    def dummy_method(self):
+        pass
+
+
 class BreadcrumbTestCase(TestCase):
 
     def test_crumb_buffer(self):
@@ -163,3 +168,28 @@ def handler(logger, level, msg, args, kwargs):
             logger.debug('aha!')
             crumbs = client.context.breadcrumbs.get_buffer()
             assert len(crumbs) == 0
+
+    def test_hook_libraries(self):
+
+        @breadcrumbs.libraryhook('dummy')
+        def _install_func():
+            old_func = DummyClass.dummy_method
+
+            def new_func(self):
+                breadcrumbs.record(type='dummy', category='dummy', message="Dummy message")
+                old_func(self)
+
+            DummyClass.dummy_method = new_func
+
+        client = Client('http://foo:bar@example.com/0', hook_libraries=['requests'])
+        with client.context:
+            DummyClass().dummy_method()
+            crumbs = client.context.breadcrumbs.get_buffer()
+            assert 'dummy' not in set([i['type'] for i in crumbs])
+
+        client = Client('http://foo:bar@example.com/0', hook_libraries=['requests', 'dummy'])
+        with client.context:
+            DummyClass().dummy_method()
+            crumbs = client.context.breadcrumbs.get_buffer()
+            assert 'dummy' in set([i['type'] for i in crumbs])
+