rspec users - Jul 2010 - [rails] shoud I test validate_presentence_of series?

Suppose I have a model Forum, have some attributes, title, content,
tag.so I do it in Forum model.
validates_presence_of :title
validates_presence_of :tag
validates_presence_of :content.


when I added validateds_presence_of, rails will restrict the attribute
not be empty, when save record. so after that, Do I still need to test
those attributs not_valid?

like this

it ''should not be valid when title empty'' do
  Forum.new(empty_title_attrbiute_hash).should_not be_valid
end

it ''should not be valid when tag empty'' do
  Forum.new(empty_tag_attrbiute_hash).should_not be_valid
end

it ''should not be valid when content empty'' do
  Forum.new(empty_content_attrbiute_hash).should_not be_valid
end
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I like covering validation with RSpec instead of only relying on it being
covered at a higher level. I like to check for error(s) on each attribute to
be sure that the model is not invalid for some other reason. Here''s how
I do
it:

describe Forum, ''being valid'' do

  it "requires a name" do
    forum = Forum.new(:title => nil)
    forum.should_not be_valid
    forum.should have_at_least(1).error_on(:title)
  end

  it "requires a code" do
    forum = Forum.new(:tag => nil)
    forum.should_not be_valid
    forum.should have_at_least(1).error_on(:tag)
  end

  it "requires content" do
    forum = Forum.new(:content => nil)
    forum.should_not be_valid
    forum.should have_at_least(1).error_on(:content)
  end

end

Note that, in this example, you can put all of your validates_presence_of
declarations on one line.

validates_presence_of :title, :tag, :content

Regards,
Craig
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On 2010-07-21 1:41 AM, Zhenning Guan wrote:
> Suppose I have a model Forum, have some attributes, title, content,
> tag.so I do it in Forum model.
> validates_presence_of :title
> validates_presence_of :tag
> validates_presence_of :content.
>
>
> when I added validateds_presence_of, rails will restrict the attribute
> not be empty, when save record. so after that, Do I still need to test
> those attributs not_valid?
>
> like this
>
> it ''should not be valid when title empty'' do
>    Forum.new(empty_title_attrbiute_hash).should_not be_valid
> end
>
> it ''should not be valid when tag empty'' do
>    Forum.new(empty_tag_attrbiute_hash).should_not be_valid
> end
>
> it ''should not be valid when content empty'' do
>    Forum.new(empty_content_attrbiute_hash).should_not be_valid
> end
Something else to keep in mind is that in the spirit of BDD, ideally you 
are writing your specs before you write any of your code. So to write 
examples that specify attributes cannot be nil will come before the 
validates_presence_of statements in your model. Then when your tests 
pass, you know you''ve implemented the correct functionality. This is 
also a great sanity check when, later down the line, something gets 
accidentally changed or deleted in the model and you have a spec to 
catch it.

Peace,
Phillip

thank you all. :)
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