Software Testing 101

Eni Sinanaj
15 min readOct 24, 2023

The testing pyramid is a concept in software engineering that illustrates the ideal distribution of different types of automated tests. It is often used as a guideline to encourage teams to prioritize certain types of tests over others. The testing pyramid typically consists of three layers: unit tests at the base, followed by integration tests, and finally, end-to-end tests at the top. The rationale behind this structure is to create a robust and efficient testing strategy that ensures high test coverage and fast feedback loops.

1. Unit Tests

  • These are small, focused tests that verify the behavior of individual components or units of code in isolation.
  • They are typically written and executed by developers and are usually fast, reliable, and inexpensive to run.
  • Unit tests help catch bugs early in the development process and provide a solid foundation for the overall test suite.

2. Integration Tests

  • These tests focus on verifying the interactions between different components, modules, or services within a system.
  • Integration tests ensure that various parts of the system work together correctly and that data is transferred between components as expected.
  • They are broader in scope compared to unit tests and often involve testing the integration points between modules.

3. End-to-End Tests

  • These tests simulate real user scenarios and test the entire application from start to finish, including all layers and components.
  • End-to-end tests are designed to mimic how a user would interact with the system and are typically slower and more complex to set up than unit and integration tests.
  • They help ensure that the system functions as a whole and that all the integrated parts work together seamlessly.

The testing pyramid encourages a greater emphasis on writing a larger number of fast and reliable unit tests, followed by a smaller number of integration tests, and an even smaller number of end-to-end tests. This approach helps to maintain a balance between test coverage, execution speed, and overall testing costs.



Eni Sinanaj

him/him and stuff… :) Engineer, Business Development, Management, Writer #diy #automation #digitalizationftw