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

## App Constants

When the app works but the tests fail, we have a false negative. **False negatives happen sometimes,** especially when the tests rely on something external (like the E2E tests do). Anyway, **We should decrease false negatives** as much as possible. 

A lot of things can cause false negatives. For instance,  the difference between the constants used by the web app and the ones used by the tests. What are the constants used by the actual test?





# App Constants

When the app works but the tests fail, we have a false negative. **False negatives happen sometimes,** especially when the tests rely on something external (like the E2E tests do). Anyway, **We should decrease false negatives** as much as possible. 

A lot of things can cause false negatives. For instance,  the difference between the constants used by the web app and the ones used by the tests. What are the constants used by the actual test?





Let's learn how to use `share app constants` in Cypress 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

Sharing App Constants

App Constants