Testing Nokogiri XML for Attributes

Question

Using RSpec How could/should I test to ensure elements exists and have specified values In my example I'm looking to ensure I have an EnvelopeVersion with a value 1.0, i would also like to see a test just to ensure EnvelopeVersion exists ``` def self.xml_header builder = Nokogiri::XML::Builder.new do |xml| xml.Root{ xml.EnvelopeVersion "1.0" } end builder.to_xml end ``` I've tried this, but it failed undefined method `has_node?' for # ``` it 'should create valid header' do doc = GEM::xml_header doc.should have_node("EnvelopeVersion ") end ```

Accepted Answer

Your solution can be simplified:

```
doc = Nokogiri::XML::Document.parse(GEM::xml_header)    
doc.xpath('//Root/EnvelopeVersion').text.should eq("1.0")
```

can be simplified to:

```
doc = Nokogiri::XML(GEM::xml_header)    
doc.at('EnvelopeVersion').text.should eq("1.0")
```

Nokogiri has two main "find-it" methods: `search` and `at`. They are generic, in that they accept both XPath and CSS accessors. `search` returns a NodeSet of all matching nodes, and `at` returns the first Node that matches.

There are also the methods `at_xpath` and `at_css` if you want something a bit more mnemonic, along with `xpath` and `css`.

Testing Nokogiri XML for Attributes

Solution

Problem