# Keep encoding-related specs in a separate shared example to be able to skip them in IO/File/StringIO specs.
# It's difficult to check result's encoding in the test after writing to a file/io buffer.
describe :kernel_sprintf_encoding, shared: true do
  it "can produce a string with valid encoding" do
    string = @method.call("good day %{valid}", valid: "e")
    string.encoding.should == Encoding::UTF_8
    string.valid_encoding?.should be_true
  end

  it "can produce a string with invalid encoding" do
    string = @method.call("good day %{invalid}", invalid: "\x80")
    string.encoding.should == Encoding::UTF_8
    string.valid_encoding?.should be_false
  end

  it "returns a String in the same encoding as the format String if compatible" do
    string = "%s".dup.force_encoding(Encoding::KOI8_U)
    result = @method.call(string, "dogs")
    result.encoding.should equal(Encoding::KOI8_U)
  end

  it "returns a String in the argument's encoding if format encoding is more restrictive" do
    string = "foo %s".dup.force_encoding(Encoding::US_ASCII)
    argument = "b\303\274r".dup.force_encoding(Encoding::UTF_8)

    result = @method.call(string, argument)
    result.encoding.should equal(Encoding::UTF_8)
  end

  it "raises Encoding::CompatibilityError if both encodings are ASCII compatible and there are not ASCII characters" do
    string = "Ä %s".encode('windows-1252')
    argument = "Ђ".encode('windows-1251')

    -> {
      @method.call(string, argument)
    }.should raise_error(Encoding::CompatibilityError)
  end

  describe "%c" do
    it "supports Unicode characters" do
      result = @method.call("%c", 1286)
      result.should == "Ԇ"
      result.bytes.should == [212, 134]

      result = @method.call("%c", "ش")
      result.should == "ش"
      result.bytes.should == [216, 180]
    end

    it "raises error when a codepoint isn't representable in an encoding of a format string" do
      format = "%c".encode("ASCII")

      -> {
        @method.call(format, 1286)
      }.should raise_error(RangeError, /out of char range/)
    end

    it "uses the encoding of the format string to interpret codepoints" do
      format = "%c".dup.force_encoding("euc-jp")
      result = @method.call(format, 9415601)

      result.encoding.should == Encoding::EUC_JP
      result.should == "é".encode(Encoding::EUC_JP)
      result.bytes.should == [143, 171, 177]
    end
  end
end