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Feature: Custom formatters
RSpec ships with general purpose output formatters. You can tell RSpec which
one to use using the [`--format` command line option](../command-line/format-option).
When RSpec's built-in output formatters don't, however, give you everything
you need, you can write your own custom formatter and tell RSpec to use that
one instead. The simplest way is to subclass RSpec's `BaseTextFormatter`, and
then override just the methods that you want to modify.
Scenario: Custom formatter
Given a file named "custom_formatter.rb" with:
"""ruby
class CustomFormatter
# This registers the notifications this formatter supports, and tells
# us that this was written against the RSpec 3.x formatter API.
RSpec::Core::Formatters.register self, :example_started
def initialize(output)
@output = output
end
def example_started(notification)
@output << "example: " << notification.example.description
end
end
"""
And a file named "example_spec.rb" with:
"""ruby
RSpec.describe "my group" do
specify "my example" do
end
end
"""
When I run `rspec example_spec.rb --require ./custom_formatter.rb --format CustomFormatter`
Then the output should contain "example: my example"
And the exit status should be 0
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