From: Michael Fellinger <m.fellinger@...>
Date: 2009-03-02T19:34:06+09:00
Subject: Re: passing a method as a paramter

On Mon, Mar 2, 2009 at 6:49 PM, Sarah Allen <sarah@ultrasaurus.com> wrote:
> I'm probably missing some basic Ruby syntax, but I'm relatively new to
> Ruby and can't figure this out from the various references I've looked
> at
>
> I'd like to use this nifty test helper:
>
>  # Calls creation_method with nil values for field_names and asserts
> that
>  # the resulting object was not saved and that errors were added for
> that field.
>  #
>  #  assert_required_fields :create_article, :subject, :body, :author
>  def assert_required_fields(creation_method, *field_names)
>    field_names.each do |field|
>      record = send(creation_method, field => nil)
>      assert_equal false, record.valid?
>      assert_not_nil record.errors.on(field)
>    end
>  end

## Using blocks:

def assert_required_fields(*field_names, &block)
  field_names.each do |field_name|
    record = yield(field_name => nil)
    assert_equal(false, record.valid?)
    assert_not_nil(record.errors.on(field)
  end
end

# Usage:
assert_required_fields(:email, :lastname, :password){|field|
User::create(field) }


## Using the method itself

def assert_required_fields(method, *field_names)
  field_names.each do |field_name|
    record = method.call(field_name => nil)
    assert_equal(false, record.valid?)
    assert_not_nil(record.errors.on(field)
  end
end

# Usage
assert_required_fields(User.method(:create), :email, :lastname, :password)


## Using send
def assert_required_fields(obj, method, *field_names)
  field_names.each do |field_name|
    record = obj.send(method, field_name => nil)
    assert_equal(false, record.valid?)
    assert_not_nil(record.errors.on(field)
  end
end

# Usage
assert_required_fields(User, :create, :email, :lastname, :password)


^ manveru