The test checks the single tag creation with extra attributes.

>>>>templates/test.tpl
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<opt:root>
<opt:tag name="foo" single="yes">
<opt:attribute str:name="name" str:value="bar" />
bar
</opt:tag>
</opt:root>

>>>>expected.txt
OUTPUT

>>>>result.txt
<foo name="bar" />