Add more test cases with invalid python code

Author: Pierre-Sassoulas

tests/functional/p/possible_forgotten_f_prefix.py

@@ -11,6 +11,11 @@
 y = "This is a {var} used for formatting later"
 z = y.format(var="string")
 
+g = "This is a {another_var} used for formatting later"
+h = y.format(another_var="string")
+
+i = "This is {invalid /// python /// inside}"
+
 examples = [var, var_two]
 x = f"This is an example with a list: {''.join(examples) + 'well...' }"
 x = "This is an example with a list: {''.join(examples) + 'well...' }"  # [possible-forgotten-f-prefix]