Update testing.rst

docs/testing.rst

@@ -47,17 +47,23 @@ the application for testing and initializes a new database.::
 
     import os
     import tempfile
+
     import pytest
+
     from flaskr import flaskr
 
+
     @pytest.fixture
     def client(request):
         db_fd, flaskr.app.config['DATABASE'] = tempfile.mkstemp()
         flaskr.app.config['TESTING'] = True
         client = flaskr.app.test_client()
+
         with flaskr.app.app_context():
             flaskr.init_db()
+
         yield client
+
         os.close(db_fd)
         os.unlink(flaskr.app.config['DATABASE'])
 
@@ -77,8 +83,8 @@ low-level file handle and a random file name, the latter we use as
 database name.  We just have to keep the `db_fd` around so that we can use
 the :func:`os.close` function to close the file.
 
-To delete the database after the test, we close the file and remove it
-from the filesystem.
+To delete the database after the test, the fixture closes the file and removes
+it from the filesystem.
 
 If we now run the test suite, we should see the following output::
 
@@ -107,6 +113,7 @@ test function to :file:`test_flaskr.py`, like this::
 
     def test_empty_db(client):
         """Start with a blank database."""
+
         rv = client.get('/')
         assert b'No entries here so far' in rv.data
 
@@ -148,6 +155,7 @@ Add the following two functions to your :file:`test_flaskr.py` file::
             password=password
         ), follow_redirects=True)
 
+
     def logout(client):
         return client.get('/logout', follow_redirects=True)
 
@@ -155,17 +163,18 @@ Now we can easily test that logging in and out works and that it fails with
 invalid credentials.  Add this new test function::
 
     def test_login_logout(client):
-        """Make sure login and logout works"""
-        rv = login(client, flaskr.app.config['USERNAME'],
-                   flaskr.app.config['PASSWORD'])
+        """Make sure login and logout works."""
+
+        rv = login(client, flaskr.app.config['USERNAME'], flaskr.app.config['PASSWORD'])
         assert b'You were logged in' in rv.data
+
         rv = logout(client)
         assert b'You were logged out' in rv.data
-        rv = login(client, flaskr.app.config['USERNAME'] + 'x',
-                   flaskr.app.config['PASSWORD'])
+
+        rv = login(client, flaskr.app.config['USERNAME'] + 'x', flaskr.app.config['PASSWORD'])
         assert b'Invalid username' in rv.data
-        rv = login(client, flaskr.app.config['USERNAME'],
-                   flaskr.app.config['PASSWORD'] + 'x')
+
+        rv = login(client, flaskr.app.config['USERNAME'], flaskr.app.config['PASSWORD'] + 'x')
         assert b'Invalid password' in rv.data
 
 Test Adding Messages
@@ -175,9 +184,9 @@ We should also test that adding messages works.  Add a new test function
 like this::
 
     def test_messages(client):
-        """Test that messages work"""
-        login(client, flaskr.app.config['USERNAME'],
-              flaskr.app.config['PASSWORD'])
+        """Test that messages work."""
+
+        login(client, flaskr.app.config['USERNAME'], flaskr.app.config['PASSWORD'])
         rv = client.post('/add', data=dict(
             title='<Hello>',
             text='<strong>HTML</strong> allowed here'
@@ -207,11 +216,9 @@ For more complex tests with headers and status codes, check out the
 `MiniTwit Example`_ from the sources which contains a larger test
 suite.
 
-
 .. _MiniTwit Example:
    https://github.com/pallets/flask/tree/master/examples/minitwit/
 
-
 Other Testing Tricks
 --------------------