add javascript ajax example

examples/tutorial/README.rst

@@ -65,12 +65,11 @@ Test
 
 ::
 
-    pip install pytest
+    pip install '.[test]'
     pytest
 
 Run with coverage report::
 
-    pip install pytest coverage
     coverage run -m pytest
     coverage report
     coverage html  # open htmlcov/index.html in a browser

examples/tutorial/flaskr/auth.py

@@ -56,7 +56,7 @@ def register():
         elif db.execute(
             'SELECT id FROM user WHERE username = ?', (username,)
         ).fetchone() is not None:
-            error = 'User {} is already registered.'.format(username)
+            error = 'User {0} is already registered.'.format(username)
 
         if error is None:
             # the name is available, store it in the database and go to

examples/tutorial/setup.cfg

@@ -2,7 +2,7 @@
 license_file = LICENSE
 
 [bdist_wheel]
-universal = False
+universal = True
 
 [tool:pytest]
 testpaths = tests

examples/tutorial/setup.py

@@ -20,4 +20,10 @@ setup(
     install_requires=[
         'flask',
     ],
+    extras_require={
+        'test': [
+            'pytest',
+            'coverage',
+        ],
+    },
 )