require_relative '../../spec_helper'
require_relative 'fixtures/common'

describe "Exception#backtrace" do
  before :each do
    @backtrace = ExceptionSpecs::Backtrace.backtrace
  end

  it "returns nil if no backtrace was set" do
    Exception.new.backtrace.should == nil
  end

  it "returns an Array" do
    @backtrace.should.instance_of?(Array)
  end

  it "sets each element to a String" do
    @backtrace.each {|l| l.should.instance_of?(String)}
  end

  it "includes the filename of the location where self raised in the first element" do
    @backtrace.first.should =~ /common\.rb/
  end

  it "includes the line number of the location where self raised in the first element" do
    @backtrace.first.should =~ /:7:in /
  end

  it "includes the name of the method from where self raised in the first element" do
    @backtrace.first.should =~ /in [`'](?:ExceptionSpecs::Backtrace\.)?backtrace'/
  end

  it "includes the filename of the location immediately prior to where self raised in the second element" do
    @backtrace[1].should =~ /backtrace_spec\.rb/
  end

  it "includes the line number of the location immediately prior to where self raised in the second element" do
    @backtrace[1].should =~ /:6(:in )?/
  end

  ruby_version_is ""..."3.4" do
    it "contains lines of the same format for each prior position in the stack" do
      @backtrace[2..-1].each do |line|
        # This regexp is deliberately imprecise to account for the need to abstract out
        # the paths of the included mspec files and the desire to avoid specifying in any
        # detail what the in `...' portion looks like.
        line.should =~ /^.+:\d+:in `[^`]+'$/
      end
    end
  end

  ruby_version_is "3.4" do
    it "contains lines of the same format for each prior position in the stack" do
      @backtrace[2..-1].each do |line|
        # This regexp is deliberately imprecise to account for the need to abstract out
        # the paths of the included mspec files and the desire to avoid specifying in any
        # detail what the in '...' portion looks like.
        line.should =~ /^.+:\d+:in '[^`]+'$/
      end
    end
  end

  it "captures the backtrace for an exception into $!" do
    exception = begin
      raise
    rescue RuntimeError
      $!
    end

    exception.backtrace.first.should =~ /backtrace_spec/
  end

  it "captures the backtrace for an exception into $@" do
    backtrace = begin
      raise
    rescue RuntimeError
      $@
    end

    backtrace.first.should =~ /backtrace_spec/
  end

  it "returns an Array that can be updated" do
    begin
      raise
    rescue RuntimeError => e
      e.backtrace.unshift "backtrace first"
      e.backtrace[0].should == "backtrace first"
    end
  end

  it "returns the same array after duping" do
    begin
      raise
    rescue RuntimeError => err
      bt = err.backtrace
      err.dup.backtrace.should.equal?(bt)

      new_bt = ['hi']
      err.set_backtrace new_bt

      err.backtrace.should == new_bt
      err.dup.backtrace.should.equal?(new_bt)
    end
  end
end
