ruby--ruby/spec/ruby/core/exception/receiver_spec.rb

require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/common', __FILE__)

ruby_version_is "2.3" do
  describe "NameError#receiver" do
    class ::ReceiverClass
      def call_undefined_class_variable; @@doesnt_exist end
    end

    it "returns the object that raised the exception" do
      receiver = Object.new

      -> {
        receiver.doesnt_exist
      }.should raise_error(NameError) {|e| e.receiver.should equal(receiver) }
    end

    it "returns the Object class when an undefined constant is called without namespace" do
      -> {
        DoesntExist
      }.should raise_error(NameError) {|e| e.receiver.should equal(Object) }
    end

    it "returns a class when an undefined constant is called" do
      -> {
        NameErrorSpecs::ReceiverClass::DoesntExist
      }.should raise_error(NameError) {|e| e.receiver.should equal(NameErrorSpecs::ReceiverClass) }
    end

    it "returns the Object class when an undefined class variable is called" do
      -> {
        -> {
          @@doesnt_exist
        }.should complain(/class variable access from toplevel/)
      }.should raise_error(NameError) {|e| e.receiver.should equal(Object) }
    end

    it "returns a class when an undefined class variable is called in a subclass' namespace" do
      -> {
        NameErrorSpecs::ReceiverClass.new.call_undefined_class_variable
      }.should raise_error(NameError) {|e| e.receiver.should equal(NameErrorSpecs::ReceiverClass) }
    end

    it "returns the receiver when raised from #instance_variable_get" do
      receiver = Object.new

      -> {
        receiver.instance_variable_get("invalid_ivar_name")
      }.should raise_error(NameError) {|e| e.receiver.should equal(receiver) }
    end

    it "returns the receiver when raised from #class_variable_get" do
      -> {
        Object.class_variable_get("invalid_cvar_name")
      }.should raise_error(NameError) {|e| e.receiver.should equal(Object) }
    end

    it "raises an ArgumentError when the receiver is none" do
      -> { NameError.new.receiver }.should raise_error(ArgumentError)
    end
  end
end