Make sure the pytester plugin is called.

In the new model of gathering tests, the pytester plugin which
ensures that fixtures are started and stopped but not counted
as tests was not being run because test-name matching was no
longer working correctly.

These changes ensure that the plugin is run. Despite the small
change here, this took absolute ages to get right.

And it still doesn't fix the problem present in the previous
commit: The need for the test_pytest function to be present
in the namespace of the test module. So a few more iterations
remain.

gabbi/driver.py

@@ -185,9 +185,9 @@ def py_test_generator(test_dir, host=None, port=8001, intercept=None,
 
 
 def test_pytest(test, result):
-    try:
+    if result:
         test(result)
-    except TypeError:
+    else:
         test()
 
 

gabbi/pytester.py

@@ -30,9 +30,11 @@ STOPS = {}
 
 def get_cleanname(item):
     """Extract a test name from a pytest Function item."""
-    cleanname = item.name[2:]
-    cleanname = cleanname[:-2]
+    if '[' in item.name:
+        cleanname = item.name.split('[', 1)[1]
+        cleanname = cleanname.split(']', 1)[0]
         return cleanname
+    return item.name
 
 
 def get_suitename(name):
@@ -86,10 +88,13 @@ def a_pytest_collection_modifyitems(items, config):
             continue
         suitename = get_suitename(cleanname)
         if cleanname.startswith('start_'):
-            STARTS[suitename] = item
+            test = item.callspec.params['test']
+            result = item.callspec.params['result']
+            STARTS[suitename] = (test, result)
             deselected.append(item)
         elif cleanname.startswith('stop_'):
-            STOPS[suitename] = item
+            test = item.callspec.params['test']
+            STOPS[suitename] = test
             deselected.append(item)
         else:
             remaining.append(item)
@@ -118,20 +123,11 @@ def pytest_runtest_setup(item):
     run its priors after running this.
     """
     if hasattr(item, 'starter'):
-        try:
-            # Python 2
-            item.starter.function(item.starter.obj.__self__, item._args[0])
-        except TypeError:
-            # Python 3
-            item.starter.function(item._args[0])
+        test, result = item.starter
+        test(result)
 
 
 def pytest_runtest_teardown(item, nextitem):
     """Run a stopper if a test has one."""
     if hasattr(item, 'stopper'):
-        try:
-            # Python 2
-            item.stopper.function(item.stopper.obj.__self__)
-        except TypeError:
-            # Python 3
-            item.stopper.function()
+        item.stopper()

gabbi/tests/test_gabbits_pytest.py

@@ -19,9 +19,9 @@ without duplication.
 
 import os
 
-# TODO: this test_* needs to be imported bare or things do not work
-from gabbi.driver import test_pytest
 from gabbi import driver
+# TODO(cdent): this test_* needs to be imported bare or things do not work
+from gabbi.driver import test_pytest  # noqa
 from gabbi.tests import simple_wsgi
 from gabbi.tests import test_intercept