> For the complete documentation index, see [llms.txt](https://sydrawat.gitbook.io/react/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sydrawat.gitbook.io/react/miscellaneous/testing.md).

# Testing

## What & Why?

What is testing? Why do we need tests.

![Manual vs Automated Testing](/files/-M_UN0GpxQxWR3QBE2z8)

## Types of Automated Tests

There are 3 basic categories of automated tests:

1. Unit Tests
2. Integration Tests
3. End-to-end (e2e) Tests

![Types of Automated Tests](/files/-M_URUH5hsLR5aJCAE17)

### Unit Tests

These are the most common and important type of tests. Unit tests are basically the ones that test the **individual building blocks** (functions, components) of the app **in isolation**.

A typical app contains dozens and hundreds of unit tests.

### Integration Tests

Integration tests usually test the **combination** of multiple building blocks. Projects typically contain a couple of integration tests. These are also important, but the focus is more on unit tests.

### E2E Tests

These automated tests test the complete scenarios in our app as the user would experience them. Projects typically contain a few end-to-end tests. These types of test are important, but can also be done manually (*partially*).

## What & How to Test?

We'll be working with unit tests, so typically we will be testing the smallest building blocks of our code.

![What & How to test our app.](/files/-M_UTdKG1PfyYQewK-8Y)


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