update

docs/config.md

@@ -4,9 +4,7 @@ following [the twelve-factor pattern][twelve-factor].
 Configuration should be stored in environment variables, or in a ".env" file
 that is not committed to source control.
 
-**app.py**:
-
-```python
+```python title="app.py"
 from sqlalchemy import create_engine
 from starlette.applications import Starlette
 from starlette.config import Config
@@ -25,9 +23,7 @@ engine = create_engine(DATABASE_URL)
 ...
 ```
 
-**.env**:
-
-```shell
+```shell title=".env"
 # Don't commit this to source control.
 # Eg. Include ".env" in your `.gitignore` file.
 DEBUG=True
@@ -94,12 +90,10 @@ is set *after* the point that it has already been read by the configuration.
 If you're using `pytest`, then you can setup any initial environment in
 `tests/conftest.py`.
 
-**tests/conftest.py**:
-
-```python
+```python title="tests/conftest.py"
 from starlette.config import environ
 
-environ['TESTING'] = 'TRUE'
+environ['DEBUG'] = 'TRUE'
 ```
 
 ## Reading prefixed environment variables
@@ -132,24 +126,19 @@ we can start to structure an application.
 First, let's keep our settings, our database table definitions, and our
 application logic separated:
 
-**myproject/settings.py**:
-
-```python
+```python title="myproject/settings.py"
 from starlette.config import Config
 from starlette.datastructures import Secret
 
 config = Config(".env")
 
 DEBUG = config('DEBUG', cast=bool, default=False)
-TESTING = config('TESTING', cast=bool, default=False)
 SECRET_KEY = config('SECRET_KEY', cast=Secret)
 
 DATABASE_URL = config('DATABASE_URL')
 ```
 
-**myproject/tables.py**:
-
-```python
+```python title="myproject/tables.py"
 import sqlalchemy
 
 # Database table definitions.
@@ -160,9 +149,7 @@ organisations = sqlalchemy.Table(
 )
 ```
 
-**myproject/app.py**
-
-```python
+```python title="myproject/app.py"
 from starlette.applications import Starlette
 from starlette.middleware import Middleware
 from starlette.middleware.sessions import SessionMiddleware
@@ -192,16 +179,14 @@ Now let's deal with our test configuration.
 We'd like to create a new test database every time the test suite runs,
 and drop it once the tests complete. We'd also like to ensure
 
-**tests/conftest.py**:
-
-```python
+```python title="tests/conftest.py"
 from starlette.config import environ
 from starlette.testclient import TestClient
 from sqlalchemy import create_engine
 from sqlalchemy_utils import create_database, database_exists, drop_database
 
 # This line would raise an error if we use it after 'settings' has been imported.
-environ['TESTING'] = 'TRUE'
+environ['DEBUG'] = 'TRUE'
 
 from myproject import settings
 from myproject.app import app