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

# -*- encoding: utf-8 -*-
require_relative '../../spec_helper'
require_relative 'fixtures/classes'

describe "String#upcase" do
  it "returns a copy of self with all lowercase letters upcased" do
    "Hello".upcase.should == "HELLO"
    "hello".upcase.should == "HELLO"
  end

  ruby_version_is ''...'2.4' do
    it "is locale insensitive (only replaces a-z)" do
      "äöü".upcase.should == "äöü"

      str = Array.new(256) { |c| c.chr }.join
      expected = Array.new(256) do |i|
        c = i.chr
        c.between?("a", "z") ? c.upcase : c
      end.join

      str.upcase.should == expected
    end
  end

  ruby_version_is '2.4' do
    describe "full Unicode case mapping" do
      it "works for all of Unicode with no option" do
        "äöü".upcase.should == "ÄÖÜ"
      end

      it "updates string metadata" do
        upcased = "aßet".upcase

        upcased.should == "ASSET"
        upcased.size.should == 5
        upcased.bytesize.should == 5
        upcased.ascii_only?.should be_true
      end
    end

    describe "ASCII-only case mapping" do
      it "does not upcase non-ASCII characters" do
        "aßet".upcase(:ascii).should == "AßET"
      end
    end

    describe "full Unicode case mapping adapted for Turkic languages" do
      it "upcases ASCII characters according to Turkic semantics" do
        "i".upcase(:turkic).should == "İ"
      end

      it "allows Lithuanian as an extra option" do
        "i".upcase(:turkic, :lithuanian).should == "İ"
      end

      it "does not allow any other additional option" do
        lambda { "i".upcase(:turkic, :ascii) }.should raise_error(ArgumentError)
      end
    end

    describe "full Unicode case mapping adapted for Lithuanian" do
      it "currently works the same as full Unicode case mapping" do
        "iß".upcase(:lithuanian).should == "ISS"
      end

      it "allows Turkic as an extra option (and applies Turkic semantics)" do
        "iß".upcase(:lithuanian, :turkic).should == "İSS"
      end

      it "does not allow any other additional option" do
        lambda { "iß".upcase(:lithuanian, :ascii) }.should raise_error(ArgumentError)
      end
    end

    it "does not allow the :fold option for upcasing" do
      lambda { "abc".upcase(:fold) }.should raise_error(ArgumentError)
    end

    it "does not allow invalid options" do
      lambda { "abc".upcase(:invalid_option) }.should raise_error(ArgumentError)
    end
  end

  it "taints result when self is tainted" do
    "".taint.upcase.tainted?.should == true
    "X".taint.upcase.tainted?.should == true
    "x".taint.upcase.tainted?.should == true
  end

  it "returns a subclass instance for subclasses" do
    StringSpecs::MyString.new("fooBAR").upcase.should be_an_instance_of(StringSpecs::MyString)
  end
end

describe "String#upcase!" do
  it "modifies self in place" do
    a = "HeLlO"
    a.upcase!.should equal(a)
    a.should == "HELLO"
  end

  ruby_version_is '2.4' do
    describe "full Unicode case mapping" do
      it "modifies self in place for all of Unicode with no option" do
        a = "äöü"
        a.upcase!
        a.should == "ÄÖÜ"
      end

      it "updates string metadata for self" do
        upcased = "aßet"
        upcased.upcase!

        upcased.should == "ASSET"
        upcased.size.should == 5
        upcased.bytesize.should == 5
        upcased.ascii_only?.should be_true
      end
    end

    describe "modifies self in place for ASCII-only case mapping" do
      it "does not upcase non-ASCII characters" do
        a = "aßet"
        a.upcase!(:ascii)
        a.should == "AßET"
      end
    end

    describe "modifies self in place for full Unicode case mapping adapted for Turkic languages" do
      it "upcases ASCII characters according to Turkic semantics" do
        a = "i"
        a.upcase!(:turkic)
        a.should == "İ"
      end

      it "allows Lithuanian as an extra option" do
        a = "i"
        a.upcase!(:turkic, :lithuanian)
        a.should == "İ"
      end

      it "does not allow any other additional option" do
        lambda { a = "i"; a.upcase!(:turkic, :ascii) }.should raise_error(ArgumentError)
      end
    end

    describe "modifies self in place for full Unicode case mapping adapted for Lithuanian" do
      it "currently works the same as full Unicode case mapping" do
        a = "iß"
        a.upcase!(:lithuanian)
        a.should == "ISS"
      end

      it "allows Turkic as an extra option (and applies Turkic semantics)" do
        a = "iß"
        a.upcase!(:lithuanian, :turkic)
        a.should == "İSS"
      end

      it "does not allow any other additional option" do
        lambda { a = "iß"; a.upcase!(:lithuanian, :ascii) }.should raise_error(ArgumentError)
      end
    end

    it "does not allow the :fold option for upcasing" do
      lambda { a = "abc"; a.upcase!(:fold) }.should raise_error(ArgumentError)
    end

    it "does not allow invalid options" do
      lambda { a = "abc"; a.upcase!(:invalid_option) }.should raise_error(ArgumentError)
    end
  end

  it "returns nil if no modifications were made" do
    a = "HELLO"
    a.upcase!.should == nil
    a.should == "HELLO"
  end

  it "raises a #{frozen_error_class} when self is frozen" do
    lambda { "HeLlo".freeze.upcase! }.should raise_error(frozen_error_class)
    lambda { "HELLO".freeze.upcase! }.should raise_error(frozen_error_class)
  end
end