In RSpec, the --fail-fast option stops the test suite execution as soon as a test failure occurs. This means that RSpec will immediately stop running any further tests as soon as it encounters the first failure, and will exit with a non-zero status code indicating that the test run has failed.

By default, when running RSpec tests, the entire test suite is executed regardless of whether a test fails or not. This can be time-consuming and may not be necessary if you’re only interested in fixing the first failure you encounter.

With --fail-fast, you can quickly identify the first failing test and focus on fixing that specific issue before running the entire test suite again.

To use --fail-fast, you can pass it as an argument when running the rspec command. For example:

rspec --fail-fast

Alternatively, you can set --fail-fast as a default option in your RSpec configuration file. To do this, you can add the following line to your spec_helper.rb or rails_helper.rb file:

RSpec.configure do |config|
  config.fail_fast = true

This will make --fail-fast the default behavior for all rspec commands executed within your project.

For more info, see the Configuration section.

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