From 3e3cb00013f7727f73197f88aad1aabc9298e2d0 Mon Sep 17 00:00:00 2001
From: JasonHomeWorkstationUbuntu <jasonzhuyq@outlook.com>
Date: Mon, 9 Nov 2020 15:10:06 +1100
Subject: [PATCH] Chapter 5. Recap

---
 textbook/chap5.md | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/textbook/chap5.md b/textbook/chap5.md
index 6e6760d..5bc7cdc 100644
--- a/textbook/chap5.md
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@@ -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
-```
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+```
+
+## 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.
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