Python: add test for part boundaries

python/ql/test/library-tests/regexparser/locations.py

@@ -55,9 +55,10 @@ re.compile( # $ location=1:2 location=1:26
 )
 
 # plain string with multiple parts across lines
-re.compile( # $ location=1:2 location=2:7
+re.compile( # $ location=1:2 location=2:7 SPURIOUS:location=2:29 MISSING:location=3:2
 '[this] is a test'
 ' and [this] is another test'
+'[this] comes right at the start of a part'
 )
 
 # plain string with multiple parts across lines and comments