reading-notes

401 Class-02 Testing and Modules

In Tests We Trust

• TDD - test driven development

• Unit Tests - piece of code to exercise input, output and behavior.

• Test Name - descriptive, expected result and what is testing.

• Test File Name - follow module name

mymodule/ module.py

• Arrange - organize data to execute piece of code (input)
• Act - execute test code

• Assert - check the result (output)

• Cycle - 3 steps
  • Write a unit test and make it fail
  • Write a feature and make it pass
  • Refactor the code

Recursion

• Recursion - function calls itself directly or indirectly

• Recursive function - corresponding function

f(n) = 1                  n=1

f(n) = n + f(n-1)    n>1

function “ f( ) ” itself is being called inside the function

• Direct recursive - function calls same function

• Indirect recursive - functions calls another function which calls the latter function directly or indirectly

• Tail recursive - recursive call is last thing executed by function

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