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---
title: >
Writing test and implementation code are the same task
pubDate: 2023-08-15
permalink: >-
daily/2023/08/15/writing-test-and-implementation-code-are-the-same-task
tags:
- automated-testing
- test-driven-development
---
In Sunday's email, I said not to estimate separately for testing and implementation.
But you can't do this anyway if you're doing test-driven development.
With TDD, you aren't writing all of your tests and all of the implementation code or vice versa.
You're continuously switching back and forth, starting by writing a failing test and then enough implementation code for it to pass.
Then you write more test code, whether expanding the same test or writing a new one until you have a new failure.
You get it to pass, refactor, and repeat the process until the task is complete.
It's all part of the same task and the same estimate.