update(testing_doc): Fixture code sample updated

This now reflects the current codebase of the testing app which
implements the factory pattern.

docs/testing.rst

@@ -37,33 +37,48 @@ The Testing Skeleton
 --------------------
 
 We begin by adding a tests directory under the application root.  Then
-create a Python file to store our test configuration (:file:`conftest.py`).
+create a Python file to store our test configuration (:file:`conftest.py`). This
+is a special file that will be automatically loaded by pytest on runtime.
 
 Next, we create a `pytest fixture`_ called
-:func:`client` that configures
+:func:`client` in (:file:`conftest.py`), which configures
 the application for testing and initializes a new database.::
 
     import os
     import tempfile
-
     import pytest
+    from flaskr.factory import create_app
+    from flaskr.blueprints.flaskr import init_db
+
+
+    @pytest.fixture
+    def app(request):
+
+        db_fd, temp_db_location = tempfile.mkstemp()
+        config = {
+            'DATABASE': temp_db_location,
+            'TESTING': True,
+            'DB_FD': db_fd
+        }
+
+        app = create_app(config=config)
 
-    from flaskr import flaskr
+        with app.app_context():
+            init_db()
+            yield app
 
 
     @pytest.fixture
-    def client():
-        db_fd, flaskr.app.config['DATABASE'] = tempfile.mkstemp()
-        flaskr.app.config['TESTING'] = True
-        client = flaskr.app.test_client()
+    def client(request, app):
 
-        with flaskr.app.app_context():
-            flaskr.init_db()
+        client = app.test_client()
 
-        yield client
+        def teardown():
+            os.close(app.config['DB_FD'])
+            os.unlink(app.config['DATABASE'])
+        request.addfinalizer(teardown)
 
-        os.close(db_fd)
-        os.unlink(flaskr.app.config['DATABASE'])
+        return client
 
 This client fixture will be called by each individual test.  It gives us a
 simple interface to the application, where we can trigger test requests to the