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

describe "Kernel#respond_to?" do
  before :each do
    @a = KernelSpecs::A.new
  end

  it "is a public method" do
    Kernel.should have_public_instance_method(:respond_to?, false)
  end

  it "is only an instance method" do
    Kernel.method(:respond_to?).owner.should == Kernel
  end

  it "returns false if the given method was undefined" do
    @a.respond_to?(:undefed_method).should == false
    @a.respond_to?("undefed_method").should == false
  end

  it "returns true if obj responds to the given public method" do
    @a.respond_to?(:pub_method).should == true
    @a.respond_to?("pub_method").should == true
  end

  it "throws a type error if argument can't be coerced into a Symbol" do
    lambda { @a.respond_to?(Object.new) }.should raise_error(TypeError)
  end

  it "returns false if obj responds to the given protected method" do
    @a.respond_to?(:protected_method).should == false
    @a.respond_to?("protected_method").should == false
  end

  it "returns false if obj responds to the given private method" do
    @a.respond_to?(:private_method).should == false
    @a.respond_to?("private_method").should == false
  end

  it "returns true if obj responds to the given protected method (include_private = true)" do
    @a.respond_to?(:protected_method, true).should == true
    @a.respond_to?("protected_method", true).should == true
  end

  it "returns false if obj responds to the given protected method (include_private = false)" do
    @a.respond_to?(:protected_method, false).should == false
    @a.respond_to?("protected_method", false).should == false
  end

  it "returns false even if obj responds to the given private method (include_private = false)" do
    @a.respond_to?(:private_method, false).should == false
    @a.respond_to?("private_method", false).should == false
  end

  it "returns true if obj responds to the given private method (include_private = true)" do
    @a.respond_to?(:private_method, true).should == true
    @a.respond_to?("private_method", true).should == true
  end

  it "does not change method visibility when finding private method" do
    KernelSpecs::VisibilityChange.respond_to?(:new, false).should == false
    KernelSpecs::VisibilityChange.respond_to?(:new, true).should == true
    lambda { KernelSpecs::VisibilityChange.new }.should raise_error(NoMethodError)
  end

  it "indicates if an object responds to a particular message" do
    class KernelSpecs::Foo; def bar; 'done'; end; end
    KernelSpecs::Foo.new.respond_to?(:bar).should == true
    KernelSpecs::Foo.new.respond_to?(:invalid_and_silly_method_name).should == false
  end

end