always check for files in site-packages - add simple test for installing twice

tests/functional/test_yaml.py

@@ -113,7 +113,7 @@ def handle_install_request(script, requirement, options):
         # Check which packages got installed
         retval["install"] = []
 
-        for path in result.files_created:
+        for path in os.listdir(script.site_packages_path):
             if path.endswith(".dist-info"):
                 name, version = (
                     os.path.basename(path)[:-len(".dist-info")]

tests/yaml/install/simple.yml

@@ -9,9 +9,13 @@ cases:
 -
   request:
     - install: simple
+    - install: dep
   response:
     - state:
       - simple 0.2.0
+    - state:
+      - dep 0.1.0
+      - simple 0.2.0
 -
   request:
     - install: base