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Backtrace filtering

The following configuration setting will filter out lines in backtraces that come from Rails gems in order to reduce the noise in test failure output:

RSpec.configure do |config|
  config.filter_rails_from_backtrace!
end

rspec will always show the full backtrace output when run with the --backtrace commandline option.

Background (Using filter_rails_from_backtrace!)​

Given a file named "spec/failing_spec.rb" with:

require "rails_helper"

RSpec.configure do |config|
  config.filter_rails_from_backtrace!
end

RSpec.describe "Controller", type: :controller do
  controller do
    def index
      raise "Something went wrong."
    end
  end

  describe "GET index" do
    it "raises an error" do
      get :index
    end
  end
end

Using the bare rspec command​

When I run rspec

Then the output should contain "1 example, 1 failure"

And the output should not contain "activesupport".

Using rspec --backtrace​

When I run rspec --backtrace

Then the output should contain "1 example, 1 failure"

And the output should contain "activesupport".