Refactor assertion messages in test_function.py for clarity

Author: Buba98

tests/test_function.py

@@ -4,8 +4,7 @@
 def f_finite(regexEnumerator: RegexEnumerator, possibilities: list[str]):
     while len(possibilities) != 0:
         res = regexEnumerator.next()
-        assert res in possibilities, f"Generated string '{
-            res}' is not in the possibilities."
+        assert res in possibilities, f"'{res}' is not in the possibilities."
         possibilities.remove(res)
 
     assert regexEnumerator.done
@@ -14,8 +13,7 @@ def f_finite(regexEnumerator: RegexEnumerator, possibilities: list[str]):
 def f_infinite(regexEnumerator: RegexEnumerator, possibilities: list[str]):
     while len(possibilities) != 0:
         res = regexEnumerator.next()
-        assert res in possibilities, f"Generated string '{
-            res}' is not in the possibilities."
+        assert res in possibilities, f"'{res}' is not in the possibilities."
         possibilities.remove(res)
 
     assert not regexEnumerator.done