```ruby
require './lib/em-dextras'

require 'em-dextras/spec'
```

Configure focus flag for guard rspec
user
```ruby
require './lib/em-dextras'

require 'em-dextras/spec'

RSpec.configure do |config|
  config.filter_run focus: true
  config.run_all_when_everything_filtered = true
  config.treat_symbols_as_metadata_keys_with_true_values = true
end
```
assistant