require_relative '../../spec_helper' require_relative 'fixtures/classes' describe :kernel_String, shared: true do it "converts nil to a String" do @object.send(@method, nil).should == "" end it "converts a Float to a String" do @object.send(@method, 1.12).should == "1.12" end it "converts a boolean to a String" do @object.send(@method, false).should == "false" @object.send(@method, true).should == "true" end it "converts a constant to a String" do @object.send(@method, Object).should == "Object" end it "calls #to_s to convert an arbitrary object to a String" do obj = mock('test') obj.should_receive(:to_s).and_return("test") @object.send(@method, obj).should == "test" end it "raises a TypeError if #to_s does not exist" do obj = mock('to_s') class << obj undef_method :to_s end lambda { @object.send(@method, obj) }.should raise_error(TypeError) end # #5158 it "raises a TypeError if respond_to? returns false for #to_s" do obj = mock("to_s") class << obj def respond_to?(meth, include_private=false) meth == :to_s ? false : super end end lambda { @object.send(@method, obj) }.should raise_error(TypeError) end it "raises a TypeError if #to_s is not defined, even though #respond_to?(:to_s) returns true" do # cannot use a mock because of how RSpec affects #method_missing obj = Object.new class << obj undef_method :to_s def respond_to?(meth, include_private=false) meth == :to_s ? true : super end end lambda { @object.send(@method, obj) }.should raise_error(TypeError) end it "calls #to_s if #respond_to?(:to_s) returns true" do obj = mock('to_s') class << obj undef_method :to_s def method_missing(meth, *args) meth == :to_s ? "test" : super end end @object.send(@method, obj).should == "test" end it "raises a TypeError if #to_s does not return a String" do (obj = mock('123')).should_receive(:to_s).and_return(123) lambda { @object.send(@method, obj) }.should raise_error(TypeError) end it "returns the same object if it is already a String" do string = "Hello" string.should_not_receive(:to_s) string2 = @object.send(@method, string) string.should equal(string2) end it "returns the same object if it is an instance of a String subclass" do subklass = Class.new(String) string = subklass.new("Hello") string.should_not_receive(:to_s) string2 = @object.send(@method, string) string.should equal(string2) end end describe "Kernel.String" do it_behaves_like :kernel_String, :String, Kernel end describe "Kernel#String" do it_behaves_like :kernel_String, :String, Object.new it "is a private method" do Kernel.should have_private_instance_method(:String) end end