Jest Unit Tests
#What is Jest?
#Jest Key Features
Most recognizable Jest features include:
- Automatic mock generation: Jest can automatically generate mock implementations for any external dependencies that your code relies on, making it easier to isolate and test specific parts of your code.
- Snapshot testing: Jest allows you to create snapshots of your React components, which can be used to quickly identify any unintended changes that may have occurred as a result of code changes.
- Code coverage reporting: Jest can provide you with detailed code coverage reports, highlighting which parts of your code are being tested and which are not.
- Built-in test runner: Jest includes a built-in test runner that allows you to run your tests from the command line, with support for parallel test execution and test filtering.
- Test coverage analysis: Jest can analyze the test coverage of your codebase, identifying which parts of your code are being tested and which are not.
- Built-in assertion library: Jest includes a built-in assertion library that makes it easy to write test assertions.
Some of the Jest use-cases are:
- Testing React components: Jest is widely used for testing React components, due to its seamless integration with the React framework and its built-in snapshot testing functionality.
- Continuous integration: Jest can be integrated into continuous integration (CI) pipelines, allowing for automated testing and code coverage reporting.
- Unit testing: Jest can be used for writing and running unit tests for individual functions and modules in your codebase.
- Integration testing: Jest can also be used for writing and running integration tests that test the interactions between different parts of your codebase.
- Regression testing: Jest can be used to test that changes made to your codebase do not introduce any unexpected bugs or regressions.