Since Sonar 3.1, test files can have violations. The plugin currently does not export violations reported on test files, but this feature is planned for next release (1.4 - see SONARPLUGINS-2100)
The report can contain empty cells: this is not a bug (see SONARPLUGINS-2102) and it does not affect the results shown in the table (most of the time, an empty cell means "0").

Changelog

JIRA Issues

anonymous	true
title	Release 1.3
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width	900
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url	http://jira.codehaus.org/sr/jira.issueviews:searchrequest-xml/temp/SearchRequest.xml?fixfor=18242&pid=11911&sorter/field=priority&sorter/order=DESC&tempMax=1000

JIRA Issues

anonymous	true
title	Release 1.2
height	60
renderMode	static
width	900
columns	type;key;summary;priority;status;resolution
url	http://jira.codehaus.org/sr/jira.issueviews:searchrequest-xml/temp/SearchRequest.xml?fixfor=18226&pid=11911&sorter/field=priority&sorter/order=DESC&tempMax=1000

CSV Export Plugin