require_relative '../../spec_helper' require_relative 'fixtures/classes' require_relative 'shared/concat' describe "String#+" do it "returns a new string containing the given string concatenated to self" do ("" + "").should == "" ("" + "Hello").should == "Hello" ("Hello" + "").should == "Hello" ("Ruby !" + "= Rubinius").should == "Ruby != Rubinius" end it "converts any non-String argument with #to_str" do c = mock 'str' c.should_receive(:to_str).any_number_of_times.and_return(' + 1 = 2') ("1" + c).should == '1 + 1 = 2' end it "raises a TypeError when given any object that fails #to_str" do lambda { "" + Object.new }.should raise_error(TypeError) lambda { "" + 65 }.should raise_error(TypeError) end it "doesn't return subclass instances" do (StringSpecs::MyString.new("hello") + "").should be_an_instance_of(String) (StringSpecs::MyString.new("hello") + "foo").should be_an_instance_of(String) (StringSpecs::MyString.new("hello") + StringSpecs::MyString.new("foo")).should be_an_instance_of(String) (StringSpecs::MyString.new("hello") + StringSpecs::MyString.new("")).should be_an_instance_of(String) (StringSpecs::MyString.new("") + StringSpecs::MyString.new("")).should be_an_instance_of(String) ("hello" + StringSpecs::MyString.new("foo")).should be_an_instance_of(String) ("hello" + StringSpecs::MyString.new("")).should be_an_instance_of(String) end it "taints the result when self or other is tainted" do strs = ["", "OK", StringSpecs::MyString.new(""), StringSpecs::MyString.new("OK")] strs += strs.map { |s| s.dup.taint } strs.each do |str| strs.each do |other| (str + other).tainted?.should == (str.tainted? | other.tainted?) end end end it_behaves_like :string_concat_encoding, :+ end