How do I verify an xPath expression in Selenium IDE?

How would I test for the following expression in Selenium?

not(//select[@id='ddlCountry']/@clas开发者_StackOverflows) or
not(contains(//select[@id='ddlCountry']/@class,'invalidValue'))

true if the class attribute doesnt exist, or if it does, the attribute doesn't contain invalidValue.

I've tried using the verifyElementPresent command, but it errors out, I assume because I'm returning a boolean rather than a node.

I'm happy with an alternative to this if theres no way to do the above using xPath.

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In case your XPath engine API doesnt allow expressions returning atomic values (not nodes), then you still can

Use:

//select[@id='ddlCountry'][contains(@class,'invalidValue')]

and test if an element was selected or not.

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true if the class attribute doesnt exist, or if it does, the attribute doesn't contain invalidValue.

not(//select[@id='ddlCountry']/@class[contains(.,'invalidValue')])