Simple, composable Bugsnag matcher.

notify_bugsnag.rb

RSpec::Matchers.define :notify_bugsnag do |error = nil, message = nil|
  supports_block_expectations

  match do |block|
    if error
      expect(Bugsnag).to receive(:notify).with(instance_of(error))
    else
      expect(Bugsnag).to receive(:notify)
    end

    yield_to block
  end

  match_when_negated do |block|
    expect(Bugsnag).to_not receive(:notify)

    yield_to block
  end

  # Used to chain an assertion about the return value of the block.
  # eg. expect { boop }.to notify_bugsnag.and eq "abc123"
  chain :and do |matcher|
    @result_matcher = matcher
  end

  private def yield_to(block)
    # Suppresses a warning when not chained with "and"
    if instance_variable_defined?(:@result_matcher) && @result_matcher
      expect(block.yield).to @result_matcher
    else
      block.yield
    end
  end
end