require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes.rb', __FILE__)

ruby_version_is '1.9.3' do
  describe "String#prepend" do
    it "prepends the given argument to self and returns self" do
      str = "world"
      str.prepend("hello ").should equal(str)
      str.should == "hello world"
    end

    it "converts the given argument to a String using to_str" do
      obj = mock("hello")
      obj.should_receive(:to_str).and_return("hello")
      a = " world!".prepend(obj)
      a.should == "hello world!"
    end

    it "raises a TypeError if the given argument can't be converted to a String" do
      lambda { a = "hello ".prepend [] }.should raise_error(TypeError)
      lambda { a = 'hello '.prepend mock('x') }.should raise_error(TypeError)
    end

    it "raises a RuntimeError when self if frozen" do
      a = "hello"
      a.freeze

      lambda { a.prepend "" }.should raise_error(RuntimeError)
      lambda { a.prepend "test" }.should raise_error(RuntimeError)
    end

    it "works when given a subclass instance" do
      a = " world"
      a.prepend StringSpecs::MyString.new("hello")
      a.should == "hello world"
    end

    it "taints self if other is tainted" do
      x = "x"
      x.prepend("".taint).tainted?.should be_true

      x = "x"
      x.prepend("y".taint).tainted?.should be_true
    end
  end
end