26 September 2021

Unit Testing (UT)

Unit Testing definition

  • Unit Testing is a Practice of testing certain functions and areas of code or individual units of source code :
    • Unit Tests is a test that isolates and verifies individual units of source code.
    • A Unit test is a way of testing a unit (the smallest piece of code) that can be logically isolated in a system.Unit Testing benefits

Unit Testing benefits

  • Identify Failures to improve quality
  • Easy to test Code produced
  • Prevent future changes from breaking functionality

Unit Testing characteristics

  • Code in each test is as small as possible while maintaining readability of the code.
  • Each test is independent of other unit tests.
  • They exercise the persistence layer of a solution.
  • Each test makes assertions about only one logical concept.

Unit Testing practice

  • Unit Testing is performed by Developers
  • Code in each Unit test should be as small as possible while maintaining readability of the code.
    • Low-level test focusing on small parts of a software system that can be executed fast and in isolation.
    • The definition and boundaries of a ‘unit’ generally depends on the context and is to be agreed by all the Developers
    • In most programming languages, that is a function, a subroutine, a method or property.
  • A Unit test can be automated.

Good Unit Test

  • A unit test is a separated and isolated test that validates a unit of functionality.
  • A good unit test should have the following characteristics:
    • A unit test does not depend on the environment
      • Does not depend on the environment; e.g. it will run on your computer and it will run on your colleague’s computer
  • Each Unit test should be independent of other unit tests.
    • Does not depend on other unit tests
  • Does not depend on external data
  • Does not have side effects
  • Asserts the results of code
  • Tests a single unit of work (mostly a method)
  • Covers all the paths of the code under test
  • Tests and asserts edge cases and different ranges of data
  • Runs fast
  • Is well‐factored and as small as possible

Good Unit Test Attributes

  • Asserts the results of code
  • Is well‐factored and as small as possible
  • Does not have side effects
  • Tests and asserts edge cases and different ranges of data
  • Runs fast

More informations for Scrum Testing

More informations for the Scrum PSD certification here.

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