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Diffstat (limited to 'spec/ruby/core/kernel/String_spec.rb')
-rw-r--r-- | spec/ruby/core/kernel/String_spec.rb | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/String_spec.rb b/spec/ruby/core/kernel/String_spec.rb new file mode 100644 index 0000000000..b24bc798e5 --- /dev/null +++ b/spec/ruby/core/kernel/String_spec.rb @@ -0,0 +1,106 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +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 |