Force the test runner to ensure the extension is loaded
!! hooks
len
pos
rpos
!! endhooks

!! test
Len
!! input
{{#len: Hello }}
!! result
<p>5
</p>
!! end

!! test
First position
!! input
{{#pos: miruvor | r }}
!! result
<p>2
</p>
!! end

!! test
Position from offset
!! input
{{#pos: miruvor | 3 }}
!! result
<p>6
</p>
!! end

!! test
Last position
!! input
{{#rpos: miruvor}}
!! result
<p>6
</p>
!! end