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Part 2 - Modularization

Chapter 4 - Separation of Concerns

  • Our source code has grown
  • Let's spend some time organizing it

Test and Production Code

We have written 2 types of code :

  1. Code that solves our Money problem
  • Including Money / Portfolio
  • We call this production code
  1. Code that verifies the problem is correctly solved
    • Including all the tests and the code needed to support these tests
    • We call this test code

Test code depends on production code, however there should be no dependency in the other direction

Checklist for cleaning tests :

  • Would we have the same code coverage if we delete a test ?
  • Does one of the tests verify a significant edge case ?
  • Do the different tests provide unique value as a living documentation ?

Update our feature list

✅ 5 USD x 2 = 10 USD 
✅ 10 EUR x 2 = 20 EUR
✅ 4002 KRW / 4 = 1000.5 KRW
✅ 5 USD + 10 USD = 15 USD
Separate test code from production code
Remove redundant tests
5 USD + 10 EUR = 17 USD
1 USD + 1100 KRW = 2200 KRW

The steps of separation of concerns vary from language to language. Saleem has dedicated 3 chapters in his boook on this topic :

  • Chapter 5, "Packages and Modules in Go"

  • Chapter 6, "Modules in Javascript"

  • Chapter 7, "Modules in Python"

  • Separate the test code from the production code

    • How to do it ?
    • Reflect on dependencies

  • Remove redundancy

    • We have 2 multiplication tests
    • Should we keep both the multiplication tests ?
    • Fill the checklist mentioned above

Where we are ?

✅ 5 USD x 2 = 10 USD 
✅ 10 EUR x 2 = 20 EUR
✅ 4002 KRW / 4 = 1000.5 KRW
✅ 5 USD + 10 USD = 15 USD
✅ Separate test code from production code
✅ Remove redundant tests
5 USD + 10 EUR = 17 USD
1 USD + 1100 KRW = 2200 KRW

step by step guide