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Takeaways from TDD and Software Design

video

  • TDD by its own CANNOT leads to good design, obviously
  • TDD as a mechanism to help us to learn more about good design
  • Software is "Soft" just because it can be changed, it is not meant to be settled in the stone
  • Test-first programming can help the team to reduce defects but it will not lead to good design

Code qualities

Practice 5: Create CLEAN Code

  • Cohesive
  • Loosely coupled
  • Encapsulated
  • Assertive
  • Nonredundant

Good code is CLEAN code

Simple design

  • Passes its tests
  • Minimizes duplication
  • Maximizes clarity
  • Has fewer elements

When a test is not a unit test

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  • It talks to the database
  • It communicates across the network
  • It touches the file system
  • It can't run at the same time as any of your other unit tests
  • You have to do special things to your environment (such as editing config files) to run it.

TDD cycle

  • Red: Write a failing test
  • Green: Make the test pass as fast as possible
  • Refactor: Take a look at your code

The Twelve-Factor App

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  • One codebase tracked in revision control, many deploys
  • Explicitly declare and isolate dependencies
  • Store config in the environment
  • Treat backing services as attached resources
  • Strictly separate build and run stages
  • Execute the app as one or more stateless processes
  • Export services via port binding
  • Scale out via the process model
  • Maximize robustness with fast startup and graceful shutdown
  • Keep development, staging, and production as similar as possible
  • Treat logs as event streams
  • Run admin/management tasks as one-off processes
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