python: add test for re.Match objects returned from finditer

Author: yoff

python/ql/test/library-tests/frameworks/stdlib/test_re.py

@@ -38,6 +38,12 @@
 
     compiled_pat.match(ts).string, # $ tainted
     re.compile(ts).match("safe").re.pattern, # $ tainted
+
+    list(re.finditer(pat, ts))[0].string, # $ MISSING: tainted
+    [m.string for m in re.finditer(pat, ts)], # $ MISSING: tainted
+
+    list(re.finditer(pat, ts))[0].groups()[0], # $ MISSING: tainted
+    [m.groups()[0] for m in re.finditer(pat, ts)], # $ MISSING: tainted
 )
 ensure_not_tainted(
     safe_match.expand("Hello \1"),