Open Development

Automated Testing

Igor dos Santos Montagner ( igorsm1@insper.edu.br )

Professional Project

• Code Quality
  • Linting - Formatting and Common Errors
• Documentation
  • User
  • Developer

Professional Project

• Code Quality
  • Linting - Formatting and Common Errors
  • Does the code work?
• Documentation
  • User
  • Developer

Does my program work?

• Under what conditions?
• On which platforms?
• Which operations are supported?
• Can I check the result of an execution? If so, is there a reference value?

Automated Testing

Idea: Write a program that verifies whether another program responds as expected.

• Define situations to be tested...
• And the expected result in each situation.

Automated Testing

Doesn't help

• Reveal new bugs
• Ensure software is bug-free

Does help

• Prevent discovered bugs from returning
• Prevent unintended changes from breaking previously working code.
• Document in which situations the software works.

Automated Testing

1. Unit Testing
2. Integration Testing
3. User Interface Testing

Unit Testing

Idea: Given a function, verify whether it returns the expected value for a given set of parameters.

• Test functions in isolation.
• Coverage: Percentage of lines of code executed during unit testing.
• Serves as function documentation

Unit tests - pytest

Integration tests

Idea: Given a set of classes with interdependencies, verify that they work well together.

• Tests interaction between objects
• Possibility of creating mocks, which are fake objects designed to simulate the interaction between multiple objects.

User interface tests

Idea: Simulates user actions (clicks, data entry, etc.) and checks if the expected output is displayed on the screen.

• Must be designed as minimally specific as possible
• Most faithful to a user's actual use

User interface tests

Selenium

Allows you to create scripts that interact with a web page, performing data entry, scrolling, and clicks. Each assert can be made with the content of a page object.

What do I need to test?

What do I need to test?

Nobody knows...

Practical activity: Tested and approved

Objective: First experience with automated code testing.

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