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

# Introduction
Recalling the signup flow E2E test:

```js
context("Signup flow", () => {
  it("The happy path should work", () => {
    cy.visit("/register");
    cy.get(".form-control").then($els => {
      cy.get($els[0]).type("Tester");
      cy.get($els[1]).type("user@realworld.io");
      cy.get($els[2]).type("mysupersecretpassword");
    });
    cy.get("button").click();
    cy.contains("No articles are here").should("be.visible");
  });
});
```

This test contains many problems. 

The test is not deterministic, meaning  **its behavior is not the same every time we restart the test**. 






Make Cypress tests more deterministic by randomizing a user.

Main E2E Test Defects: Determinism

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

Main E2E Test Defects: Determinism

Introduction