ruby--ruby/spec/ruby/core/string/encode_spec.rb

# -*- encoding: utf-8 -*-
require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../shared/encode', __FILE__)

with_feature :encoding do
  describe "String#encode" do
    before :each do
      @external = Encoding.default_external
      @internal = Encoding.default_internal
    end

    after :each do
      Encoding.default_external = @external
      Encoding.default_internal = @internal
    end

    it_behaves_like :string_encode, :encode

    describe "when passed no options" do
      it "returns a copy when Encoding.default_internal is nil" do
        Encoding.default_internal = nil
        str = "あ"
        str.encode.should_not equal(str)
      end

      it "returns a copy for a ASCII-only String when Encoding.default_internal is nil" do
        Encoding.default_internal = nil
        str = "abc"
        str.encode.should_not equal(str)
      end

      it "encodes an ascii substring of a binary string to UTF-8" do
        x82 = [0x82].pack('C')
        str =  "#{x82}foo".force_encoding("ascii-8bit")[1..-1].encode("utf-8")
        str.should == "foo".force_encoding("utf-8")
        str.encoding.should equal(Encoding::UTF_8)
      end
    end

    describe "when passed to encoding" do
      it "returns a copy when passed the same encoding as the String" do
        str = "あ"
        str.encode(Encoding::UTF_8).should_not equal(str)
      end

      it "round trips a String" do
        str = "abc def".force_encoding Encoding::US_ASCII
        str.encode("utf-32be").encode("ascii").should == "abc def"
      end
    end

    describe "when passed options" do
      it "returns a copy when Encoding.default_internal is nil" do
        Encoding.default_internal = nil
        str = "あ"
        str.encode(invalid: :replace).should_not equal(str)
      end

      it "normalizes newlines" do
        "\r\nfoo".encode(universal_newline: true).should == "\nfoo"

        "\rfoo".encode(universal_newline: true).should == "\nfoo"
      end
    end

    describe "when passed to, from" do
      it "returns a copy in the destination encoding when both encodings are the same" do
        str = "あ"
        str.force_encoding("ascii-8bit")
        encoded = str.encode("utf-8", "utf-8")

        encoded.should_not equal(str)
        encoded.encoding.should == Encoding::UTF_8
      end

      it "returns the transcoded string" do
        str = "\x00\x00\x00\x1F"
        str.encode(Encoding::UTF_8, Encoding::UTF_16BE).should == "\u0000\u001f"
      end
    end

    describe "when passed to, options" do
      it "returns a copy when the destination encoding is the same as the String encoding" do
        str = "あ"
        str.encode(Encoding::UTF_8, undef: :replace).should_not equal(str)
      end
    end

    describe "when passed to, from, options" do
      it "returns a copy when both encodings are the same" do
        str = "あ"
        str.encode("utf-8", "utf-8", invalid: :replace).should_not equal(str)
      end
    end
  end

  describe "String#encode!" do
    before :each do
      @external = Encoding.default_external
      @internal = Encoding.default_internal
    end

    after :each do
      Encoding.default_external = @external
      Encoding.default_internal = @internal
    end

    it_behaves_like :string_encode, :encode!

    it "raises a #{frozen_error_class} when called on a frozen String" do
      lambda { "foo".freeze.encode!("euc-jp") }.should raise_error(frozen_error_class)
    end

    # http://redmine.ruby-lang.org/issues/show/1836
    it "raises a #{frozen_error_class} when called on a frozen String when it's a no-op" do
      lambda { "foo".freeze.encode!("utf-8") }.should raise_error(frozen_error_class)
    end

    describe "when passed no options" do
      it "returns self when Encoding.default_internal is nil" do
        Encoding.default_internal = nil
        str = "あ"
        str.encode!.should equal(str)
      end

      it "returns self for a ASCII-only String when Encoding.default_internal is nil" do
        Encoding.default_internal = nil
        str = "abc"
        str.encode!.should equal(str)
      end
    end

    describe "when passed options" do
      it "returns self for ASCII-only String when Encoding.default_internal is nil" do
        Encoding.default_internal = nil
        str = "abc"
        str.encode!(invalid: :replace).should equal(str)
      end
    end

    describe "when passed to encoding" do
      it "returns self" do
        str = "abc"
        result = str.encode!(Encoding::BINARY)
        result.encoding.should equal(Encoding::BINARY)
        result.should equal(str)
      end
    end

    describe "when passed to, from" do
      it "returns self" do
        str = "ああ"
        result = str.encode!("euc-jp", "utf-8")
        result.encoding.should equal(Encoding::EUC_JP)
        result.should equal(str)
      end
    end
  end
end