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

describe "Kernel#instance_variables" do

  describe "immediate values" do

    it "returns an empty array if no instance variables are defined" do
      0.instance_variables.should == []
    end

    ruby_version_is ""..."1.9" do
      it "returns the correct array if an instance variable is added" do
        a = 0
        a.instance_variable_set("@test", 1)
        a.instance_variables.should == ["@test"]
      end
    end

    ruby_version_is "1.9"..."2.0" do
      it "returns the correct array if an instance variable is added" do
        a = 0
        a.instance_variable_set("@test", 1)
        a.instance_variables.should == [:@test]
      end
    end

    ruby_version_is "2.0" do
      it "returns the correct array if an instance variable is added" do
        a = 0
        lambda{ a.instance_variable_set("@test", 1) }.should raise_error(RuntimeError)
      end
    end
  end

  describe "regular objects" do

    it "returns an empty array if no instance variables are defined" do
      Object.new.instance_variables.should == []
    end

    ruby_version_is ""..."1.9" do
      it "returns the correct array if an instance variable is added" do
        a = Object.new
        a.instance_variable_set("@test", 1)
        a.instance_variables.should == ["@test"]
      end
    end

    ruby_version_is "1.9" do
      it "returns the correct array if an instance variable is added" do
        a = Object.new
        a.instance_variable_set("@test", 1)
        a.instance_variables.should == [:@test]
      end
    end
  end
end
