Chapter 5. Recap

textbook/chap5.md

@@ -422,4 +422,25 @@ AssertionError: '2: Use peacock feathers to make a fly' not found in ['1: Buy pe
 ```
 rm db.sqlite3
 python manage.py migrate --noinput
-```
+```
+
+## Recap
+
+Learning outcome:
+* Setup a form to add new items to the list using POST.
+* Setup a simple model in the database to save list items.
+* Creating database migrations, for both test database and real database
+* 2 Django template tags `{% csrf_token %}` & `{$ for ... endfor $}` loop
+
+Useful TDD Concepts:
+* **Regression**: When new code breaks some aspect of application (which used to work).
+*  **Unexpected failure**: When a test fails unexpectedly. Reason: 
+   *  1. mistake in our tests; 
+   *  2. Tests have helped us find a regression, and we need to fix sth in our code.
+*  **Red/Green/Refactor**: TDD process in another language. 
+   *  Write a test and see it fail (Red)
+   *  Write some code to get it pass (Green)
+   *  Refactor to improve implementation
+*  **Triangulation**: Generalizing the implementation by adding new test case to cover new specific e.g.
+*  **Three strikes and refactor**: Rule to remove duplication from code.
+*  **Scratchpad to-do list**: to-do list to write during coding, and check what we're doing.