Caused by: org.xml.sax.SAXNotRecognizedException: Feature 'http://cyberneko.org/html/features/scanner/allow-selfclosing-iframe' is not recognized.

[mxrguspxrt]

Steps:

1. grails create-app SomeApp
2. Do by the manual. (Add compile ":functional-test:2.0.0" to BuildConfig.groovy and make TwitterTests)
3. run grails test-app functional:

Result:

| Failure: testSearch(GroupTests)
| com.gargoylesoftware.htmlunit.ObjectInstantiationException: unable to create HTML parser

[gdubicki]

Same error here.

Tried to switch from extending BrowserTestCase to functionaltestplugin.FunctionalTestCase (as in examples in the documentation) in generated code but it didn't help.

UPDATE: ..but switching to version ":functional-test:2.0.M2", as suggested here did. :)