Delve into front-end testing principles, learn best practices for writing enduring tests, and discover strategies for E2E testing and integration into CI pipelines. Gain actionable testing insights.

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This course will provide you with important information, principles, and experience-based advice, to enter the world of testing methodologies. 

Here, you will learn the best practices to follow to write useful and lasting tests, how to test different user flows without a working back-end, how to write effective end-to-end tests (E2E), and how to integrate tests into development and Continuous Integration pipelines.

At the end of the course, you will be able to apply the fundamental principles of the test methodologies to understand what and how to test effectively.

Front-end Testing 101: Integration and End-to-end Testing

## Top to bottom approach

When you are an experienced tester, approaching a test suite is smooth sailing, but learning how to test properly is not an easy journey.

**Testing is expensive at the beginning**. Everything is new, the examples implemented might not work, and debugging a test can be difficult.


Approaching a test suite from the bottom to the top does not help. Bottom-to-top (or bottom-up) testing involves testing low-level modules first, then testing high-level modules afterward. Top to bottom testing involves verifying that high-level modules work first (**end-to-end testing**), then testing lower-level modules (**unit tests**). 



# Top to bottom approach

When you are an experienced tester, approaching a test suite is smooth sailing, but learning how to test properly is not an easy journey.

**Testing is expensive at the beginning**. Everything is new, the examples implemented might not work, and debugging a test can be difficult.


Approaching a test suite from the bottom to the top does not help. Bottom-to-top (or bottom-up) testing involves testing low-level modules first, then testing high-level modules afterward. Top to bottom testing involves verifying that high-level modules work first (**end-to-end testing**), then testing lower-level modules (**unit tests**). 



Let's explore the "top to bottom" approach in testing.

Introduction

E2E Testing

The First E2E Test

Polishing the E2E test

Ajax Requests

Custom Commands

UI Integration Tests

Other Best Practices

Bonus Section

Conclusion

Appendix

An Easier Journey: Top to Bottom

Top to bottom approach