require 'spec_helper'
require 'captivus/backtrace'

describe Captivus::Backtrace do
  def new_backtrace(*args)
    Captivus::Backtrace.new *args
  end

  describe ".new" do
    context "when the given object doesn't respond to `backtrace`" do
      it "raises an argument error" do
        object = double 'object'
        expect {
          new_backtrace object
        }.to raise_error(ArgumentError, "#{object} must respond to `backtrace`")
      end
    end
  end

  describe 'as_json' do
    before do
      @object = double 'object', :backtrace => ['/Users/x.rb:1', '/Users/x.rb:2', '/Users/x.rb:3']
    end

    context "when the object has a backtrace" do
      it 'is an array of the backtrace lines as json' do
        new_backtrace(@object).as_json.should == [
          Captivus::Backtrace::Line.new('/Users/x.rb:1').as_json,
          Captivus::Backtrace::Line.new('/Users/x.rb:2').as_json,
          Captivus::Backtrace::Line.new('/Users/x.rb:3').as_json
        ]
      end
    end

    context "when the object doesn't have a backtrace" do
      it "is an empty array" do
        @object.stub :backtrace
        new_backtrace(@object).as_json.should == []
      end
    end
  end
end