require File.join(File.dirname(__FILE__), "..", "test_helper")
require 'method_definer'

require 'stubba/instance_method'

class InstanceMethodTest < Test::Unit::TestCase
  
  include Stubba
   
  def test_should_exist
    klass = Class.new { def method_x; end }
    instance = klass.new
    method = InstanceMethod.new(instance, :method_x)
    
    assert method.exists?
  end
  
  def test_should_not_exist
    klass = Class.new { }
    instance = klass.new
    method = InstanceMethod.new(instance, :non_existent_method)
    
    assert !method.exists?
  end
  
  def test_should_raise_assertion_failed_error_when_attempting_to_stub_non_existent_method
    klass = Class.new
    instance = klass.new
    method = InstanceMethod.new(instance, :non_existent_method)

    assert_raise(Test::Unit::AssertionFailedError) { method.stub }
  end
  
  def test_should_not_raise_assertion_failed_error_when_attempting_to_stub_existing_method
    klass = Class.new { def method_x; end }
    instance = klass.new
    method = InstanceMethod.new(instance, :method_x)

    assert_nothing_raised(Test::Unit::AssertionFailedError) { method.stub }
  end
  
  def test_should_inherit_from_class_method
    assert_equal ClassMethod, InstanceMethod.superclass
  end

end