test_input_stack.rb

require 'helper'

describe "Pry#input_stack" do
  it 'should accept :input_stack as a config option' do
    stack = [StringIO.new("test")]
    Pry.new(:input_stack => stack).input_stack.should == stack
  end

  it 'should use defaults from Pry.config' do
    Pry.config.input_stack = [StringIO.new("exit")]
    Pry.new.input_stack.should == Pry.config.input_stack
    Pry.config.input_stack = []
  end

  it 'should read from all input objects on stack and exit session (usingn repl)' do
    stack = [b = StringIO.new(":cloister\nexit\n"), c = StringIO.new(":baron\n")]
    instance = Pry.new(:input => StringIO.new(":alex\n"),
                       :output => str_output = StringIO.new,
                       :input_stack => stack)

    instance.repl
    str_output.string.should =~ /:alex/
    str_output.string.should =~ /:baron/
    str_output.string.should =~ /:cloister/
  end

  it 'input objects should be popped off stack as they are used up' do
    stack = [StringIO.new(":cloister\n"), StringIO.new(":baron\n")]
    instance = Pry.new(:input => StringIO.new(":alex\n"),
                       :output => str_output = StringIO.new,
                       :input_stack => stack)

    stack.size.should == 2

    instance.rep
    str_output.string.should =~ /:alex/
    instance.rep
    str_output.string.should =~ /:baron/
    stack.size.should == 1
    instance.rep
    str_output.string.should =~ /:cloister/
    stack.size.should == 0
  end

  it 'should revert to Pry.config.input when it runs out of input objects in input_stack' do
    redirect_pry_io(StringIO.new(":rimbaud\nexit\n"), StringIO.new) do
      stack = [StringIO.new(":cloister\n"), StringIO.new(":baron\n")]
      instance = Pry.new(:input => StringIO.new(":alex\n"),
                         :output => str_output = StringIO.new,
                         :input_stack => stack)

      instance.repl
      str_output.string.should =~ /:alex/
      str_output.string.should =~ /:baron/
      str_output.string.should =~ /:cloister/
      str_output.string.should =~ /:rimbaud/
    end
  end

  it 'should display error and throw(:breakout) if at end of input after using up input_stack objects' do
    str_output = StringIO.new
    catch(:breakout) do
      redirect_pry_io(StringIO.new(":rimbaud\n"), str_output) do
        Pry.new(:input_stack => [StringIO.new(":a\n"), StringIO.new(":b\n")]).repl
      end
    end
    str_output.string.should =~ /Error: Pry ran out of things to read/
  end

end