fix: add test for file embed and code fragments #2616
                
     Merged
            
            
          
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Summary
Had an idea of adding a full line code fragment keyword (simliar to
/// [demo]). This would be useful in a HTML context, where there will be a trailing-->after a/// [demo]if it's wrapped in a comment. Thought I should add some tests for the current file embed code fragment setup first at least.Related issue, if any:
What kind of change does this PR introduce?
For any code change,
Does this PR introduce a breaking change?
Tested in the following browsers: