describe :stringio_each_separator, :shared => true do
  before(:each) do
    @io = StringIO.new("a b c d e\n1 2 3 4 5")
  end

  it "uses the passed argument as the line seperator" do
    seen = []
    @io.send(@method, " ") {|s| seen << s}
    seen.should == ["a ", "b ", "c ", "d ", "e\n1 ", "2 ", "3 ", "4 ", "5"]
  end

  it "does not change $_" do
    $_ = "test"
    @io.send(@method, " ") { |s| s}
    $_.should == "test"
  end

  it "returns self" do
    @io.send(@method) {|l| l }.should equal(@io)
  end

  it "tries to convert the passed seperator to a String using #to_str" do
    obj = mock("to_str")
    obj.stub!(:to_str).and_return(" ")

    seen = []
    @io.send(@method, obj) { |l| seen << l }
    seen.should == ["a ", "b ", "c ", "d ", "e\n1 ", "2 ", "3 ", "4 ", "5"]
  end

  it "checks whether the passed seperator responds to #to_str" do
    obj = mock('method_missing to_str')
    obj.should_receive(:respond_to?).any_number_of_times.with(:to_str).and_return(true)
    obj.should_receive(:method_missing).any_number_of_times.with(:to_str).and_return(" ")

    seen = []
    @io.send(@method, obj) { |l| seen << l }
    seen.should == ["a ", "b ", "c ", "d ", "e\n1 ", "2 ", "3 ", "4 ", "5"]
  end

  it "yields self's content starting from the current position when the passed seperator is nil" do
    seen = []
    io = StringIO.new("1 2 1 2 1 2")
    io.pos = 2
    io.send(@method, nil) {|s| seen << s}
    seen.should == ["2 1 2 1 2"]
  end

  it "yields each paragraph when passed an empty String as seperator" do
    seen = []
    io = StringIO.new("para1\n\npara2\n\n\npara3")
    io.send(@method, "") {|s| seen << s}
    seen.should == ["para1\n", "para2\n", "para3"]
  end
end

describe :stringio_each_no_arguments, :shared => true do
  before(:each) do
    @io = StringIO.new("a b c d e\n1 2 3 4 5")
  end

  it "yields each line to the passed block" do
    seen = []
    @io.send(@method) {|s| seen << s }
    seen.should == ["a b c d e\n", "1 2 3 4 5"]
  end

  it "yields each line starting from the current position" do
    seen = []
    @io.pos = 4
    @io.send(@method) {|s| seen << s }
    seen.should == ["c d e\n", "1 2 3 4 5"]
  end

  it "does not change $_" do
    $_ = "test"
    @io.send(@method) { |s| s}
    $_.should == "test"
  end

  it "uses $/ as the default line seperator" do
    seen = []
    begin
      old_rs, $/ = $/, " "
      @io.send(@method) {|s| seen << s }
      seen.should eql(["a ", "b ", "c ", "d ", "e\n1 ", "2 ", "3 ", "4 ", "5"])
    ensure
      $/ = old_rs
    end
  end

  it "returns self" do
    @io.send(@method) {|l| l }.should equal(@io)
  end

  ruby_version_is "" ... "1.8.7" do
    it "yields a LocalJumpError when passed no block" do
      lambda { @io.send(@method) }.should raise_error(LocalJumpError)
    end
  end

  ruby_version_is "1.8.7" do
    it "returns an Enumerator when passed no block" do
      enum = @io.send(@method)
      enum.instance_of?(Enumerable::Enumerator).should be_true

      seen = []
      enum.each { |b| seen << b }
      seen.should == ["a b c d e\n", "1 2 3 4 5"]
    end
  end
end

describe :stringio_each_not_readable, :shared => true do
  it "raises an IOError" do
    io = StringIO.new("a b c d e", "w")
    lambda { io.send(@method) { |b| b } }.should raise_error(IOError)

    io = StringIO.new("a b c d e")
    io.close_read
    lambda { io.send(@method) { |b| b } }.should raise_error(IOError)
  end
end
