TDD Adoption Plan and Strategies for Successful Implementation
Discover the TDD adoption plan for achieving ATDD and TDD in all projects, starting with small steps, pilot projects, and test automation strategies. Overcome anticipated problems and ensure a smooth transition to Test-Driven Development.
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Presentation Transcript
TDD adoption plan 5/27/2025 1
The goal and how to get there Goal: ATDD and TDD performed in all projects Strategy: One small step at a time New projects Easy projects first. So, services then UI modules. Learn from experience Existing non-TDD projects Automated unit testing must be completed before TDD can be applied 5/27/2025 2
Plan of the first step Pilot experiment project As plain and simple as possible to be able to focus on the TDD process As little dependency on legacy code as possible 5/27/2025 3
Pilot project Before: Some TDD training/refreshing. Posters of TDD steps and Refactor guide on the wall. During: Documentation of issues and lessons learned Daily meeting to review code, with observers from other teams. Pair programming. After: Evaluation and plan for next TDD projects Small exam for team members Team members spread out to join new TDD projects. 5/27/2025 4
Test automation Middle-tier modules JUnit, test script at app level Web modules Selenium Android non-UI modules JUnit Android UI modules Robotium iOS non-UI modules ? iOS UI modules ? XML? Routing? JSON, Javascript? 5/27/2025 5
Preparation All developers Start preparing as soon as possible, while the pilot project is running: Master writing/preparing automated tests using Junit / Selenium / Robotium, Complete automated unit tests for existing code. Master deriving specific test cases from user story spec. Someone (who?): Learn to verify if a test script covers a certain set of spec (Developer? Team leader? QA personnel?) 5/27/2025 6
Problems anticipated Easy to follow TDD steps, but not so easy to do a good job at each step Programmers confusion on where to start, what to test and what not to test, how much to test in one go, what to call their tests, and how to understand why a test fails. A guideline or a how-to doc might be necessary Not enough emphasis on refactoring. 5/27/2025 7
TDD and ATDD TDD Test Driven Development Each test pins down a technical behavior. Written by developers For developers Run frequently by the team All tests pass 100% before commit and at integration ATDD Acceptance Test Driven Development Each test pins down a business rule. Written by the team. For the team. Run frequently by the team. New tests fail until the story is done. Prior tests should all pass. 5/27/2025 8
http://www.methodsandtools.com/archive/archive.php?id=72p9 5/27/2025 10
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TDD 5/27/2025 13
TDD Steps 1. Write one unit test. 2. Build or add to the object under test until everything compiles 3. Red: Watch the test fail! 4. Green: Make all the tests pass by changing the object under tests. 5. Clean: Refactor mercilessly! 6. Repeat. 5/27/2025 14
BDD - stuff to explore TDD automatically ensures that no code is not tested. How to ensure that all functional requirements are included in the tests? BDD can help? The idea: http://www.codeproject.com/Articles/148043/Say-Hello-To- Behavior-Driven-Development-BDD-Part http://dannorth.net/introducing-bdd/ Tools with a business readable output Tools with a business readable input 5/27/2025 15
