Snapshot testing is a useful tool to test that there are no unwanted changes in your user interface. Jest generates snapshot files when the snapshot tests are executed. The next time the tests are executed, the new snapshot is compared to the previous one. If there are changes between the content of the files, the test case fails and an error message is shown in the Terminal.
To start snapshot testing, perform the following steps:
- Install the react-test-renderer package. The --save-dev parameter means that this dependency is saved to the package.json file's devDependencies part and it is only used for development purposes. If you type the npm install --production command in the installation phase, dependencies in the devDependencies part are not installed. So, all dependencies that are only required in the development phase should be installed using the...
