📝 Add an example of setting up a test database (#1144)

* Add an example of setting up a test database.

* 📝 Add/update docs for testing a DB with dependency overrides

* 🔧 Update test script, remove line removing test file as it is removed during testing

* ✅ Update testing coverage pragma

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

tests/test_tutorial/test_sql_databases/test_sql_databases.py

@@ -286,7 +286,7 @@ def client():
     # Import while creating the client to create the DB after starting the test session
     from sql_databases.sql_app.main import app
 
-    test_db = Path("./test.db")
+    test_db = Path("./sql_app.db")
     with TestClient(app) as c:
         yield c
     test_db.unlink()

tests/test_tutorial/test_sql_databases/test_sql_databases_middleware.py

@@ -286,7 +286,7 @@ def client():
     # Import while creating the client to create the DB after starting the test session
     from sql_databases.sql_app.alt_main import app
 
-    test_db = Path("./test.db")
+    test_db = Path("./sql_app.db")
     with TestClient(app) as c:
         yield c
     test_db.unlink()

tests/test_tutorial/test_sql_databases/test_testing_databases.py

@@ -0,0 +1,13 @@
+from pathlib import Path
+
+
+def test_testing_dbs():
+    # Import while creating the client to create the DB after starting the test session
+    from sql_databases.sql_app.tests.test_sql_app import test_create_user
+
+    test_db = Path("./test.db")
+    app_db = Path("./sql_app.db")
+    test_create_user()
+    test_db.unlink()
+    if app_db.is_file():  # pragma: nocover
+        app_db.unlink()