require File.expand_path('../../../spec_helper', __FILE__)
require 'expect'

describe "IO#expect" do
  before :each do
    @read, @write = IO.pipe
  end

  after :each do
    @read.close unless @read.closed?
    @write.close unless @write.closed?
  end

  it "matches data against a Regexp" do
    @write << "prompt> hello"

    result = @read.expect(/[pf]rompt>/)
    result.should == ["prompt>"]
  end

  it "matches data against a String" do
    @write << "prompt> hello"

    result = @read.expect("prompt>")
    result.should == ["prompt>"]
  end

  it "returns any captures of the Regexp" do
    @write << "prompt> hello"

    result = @read.expect(/(pro)mpt(>)/)
    result.should == ["prompt>", "pro", ">"]
  end

  it "returns raises IOError if the IO is closed" do
    @write << "prompt> hello"
    @read.close

    lambda {
      @read.expect("hello")
    }.should raise_error(IOError)
  end

  it "returns nil if eof is hit" do
    @write << "pro"
    @write.close

    @read.expect("prompt").should be_nil
  end

  it "yields the result if a block is given" do
    @write << "prompt> hello"

    res = nil

    @read.expect("prompt>") { |x| res = x }

    res.should == ["prompt>"]
  end
end
