Add functional test

Author: pmiddend

pylint/extensions/dictionary_subscript.py

@@ -14,7 +14,7 @@ class NoDictSubscriptChecker(BaseChecker):
     name = "no-dict-subscript"
     msgs = {
         "R5701": (
-            "Uses dict operator []",
+            "Using dict operator [], consider using get() instead",
             "dict-subscript",
             "Used to warn when subscripting a dictionary instead of using the get() function",
         ),

tests/functional/ext/check_dictionary_subscript/check_dictionary_subscript.py

@@ -0,0 +1,8 @@
+"""Checks the use of dictionary subscripts"""
+
+mydict = {"foo": 3}
+
+print(mydict["foo"])
+print(mydict.get("foo"))
+
+mydict["foo"] = 4

tests/functional/ext/check_dictionary_subscript/check_dictionary_subscript.rc

@@ -0,0 +1,2 @@
+[MAIN]
+load-plugins=pylint.extensions.dictionary_subscript,

tests/functional/ext/check_dictionary_subscript/check_dictionary_subscript.txt

@@ -0,0 +1 @@
+dict-subscript:5:6:5:19::"Using dict operator [], consider using get() instead":UNDEFINED