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    describe "with --ex NUM" do
      before do
        Pry.config.editor = proc do |file, line|
          @__ex_file__ = file
          @__ex_line__ = line
          nil
        end
      end

      it 'should start editor on first level of backtrace when --ex used with no argument ' do
        pry_instance = Pry.new(:input => StringIO.new("edit -n --ex"), :output => StringIO.new)
        pry_instance.last_exception = MockPryException.new("a:1", "b:2", "c:3")
        pry_instance.rep(self)
        @__ex_file__.should == "a"
        @__ex_line__.should == 1
      end

      it 'should start editor on first level of backtrace when --ex 0 used ' do
        pry_instance = Pry.new(:input => StringIO.new("edit -n --ex 0"), :output => StringIO.new)
        pry_instance.last_exception = MockPryException.new("a:1", "b:2", "c:3")
        pry_instance.rep(self)
        @__ex_file__.should == "a"
        @__ex_line__.should == 1
      end

      it 'should start editor on second level of backtrace when --ex 1 used' do
        pry_instance = Pry.new(:input => StringIO.new("edit -n --ex 1"), :output => StringIO.new)
        pry_instance.last_exception = MockPryException.new("a:1", "b:2", "c:3")
        pry_instance.rep(self)
        @__ex_file__.should == "b"
        @__ex_line__.should == 2
      end

      it 'should start editor on third level of backtrace when --ex 2 used' do
        pry_instance = Pry.new(:input => StringIO.new("edit -n --ex 2"), :output => StringIO.new)
        pry_instance.last_exception = MockPryException.new("a:1", "b:2", "c:3")
        pry_instance.rep(self)
        @__ex_file__.should == "c"
        @__ex_line__.should == 3
      end

      it 'should display error message when backtrace level is out of bounds (using --ex 4)' do
        pry_instance = Pry.new(:input => StringIO.new("edit -n --ex 4"), :output => str_output = StringIO.new)
        pry_instance.last_exception = MockPryException.new("a:1", "b:2", "c:3")
        pry_instance.rep(self)
        str_output.string.should =~ /Exception has no associated file/
      end
    end