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

with_feature :encoding do
  describe "Encoding.default_internal" do
    before :each do
      @original_encoding = Encoding.default_internal
    end

    after :each do
      Encoding.default_internal = @original_encoding
    end

    it "is nil by default" do
      Encoding.default_internal.should be_nil
    end

    it "returns an Encoding object if a default internal encoding is set" do
      Encoding.default_internal = Encoding::ASCII
      Encoding.default_internal.should be_an_instance_of(Encoding)
    end

    it "returns nil if no default internal encoding is set" do
      Encoding.default_internal = nil
      Encoding.default_internal.should be_nil
    end

    it "returns the default internal encoding" do
      Encoding.default_internal = Encoding::ASCII_8BIT
      Encoding.default_internal.should == Encoding::ASCII_8BIT
    end

    describe "with command line options" do
      it "returns Encoding::UTF_8 if ruby was invoked with -U" do
        ruby_exe("print Encoding.default_internal", options: '-U').
          should == 'UTF-8'
      end

      it "uses the encoding specified when ruby is invoked with an '-E :internal' argument" do
        ruby_exe("print Encoding.default_internal", options: '-E :SHIFT_JIS').
          should == 'Shift_JIS'
      end

      it "uses the encoding specified when ruby is invoked with an '-E external:internal' argument" do
        ruby_exe("print Encoding.default_internal", options: '-E UTF-8:SHIFT_JIS').
          should == 'Shift_JIS'
      end
    end
  end

  describe "Encoding.default_internal=" do
    before :each do
      @original_encoding = Encoding.default_internal
    end

    after :each do
      Encoding.default_internal = @original_encoding
    end

    it "sets the default internal encoding" do
      Encoding.default_internal = Encoding::SHIFT_JIS
      Encoding.default_internal.should == Encoding::SHIFT_JIS
    end

    it "can accept a name of an encoding as a String" do
      Encoding.default_internal = 'Shift_JIS'
      Encoding.default_internal.should == Encoding::SHIFT_JIS
    end

    it "calls #to_str to convert an object to a String" do
      obj = mock('string')
      obj.should_receive(:to_str).at_least(1).times.and_return('ascii')

      Encoding.default_internal = obj
      Encoding.default_internal.should == Encoding::ASCII
    end

    it "raises a TypeError if #to_str does not return a String" do
      obj = mock('string')
      obj.should_receive(:to_str).at_least(1).times.and_return(1)

      lambda { Encoding.default_internal = obj }.should raise_error(TypeError)
    end

    it "raises a TypeError when passed an object not providing #to_str" do
      lambda { Encoding.default_internal = mock("encoding") }.should raise_error(TypeError)
    end

    it "accepts an argument of nil to unset the default internal encoding" do
      Encoding.default_internal = nil
      Encoding.default_internal.should be_nil
    end
  end
end