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If you want to be selective about which tests run, you can use the --filter option, which can take mutliple values. Each filter should be a regular expression.

Run yarn betterer --filter my-test to run Betterer with a filter.

Run yarn betterer --filter my-test --filter my-other-test to run Betterer with multiple filters.

When running in Watch mode, filters can be updated on the fly by first pressing f, and then modifying the current filter.