Fix FQN of unittest.mock.Mock (#678)

Author: guillaume-dequenne

python-checks/src/main/java/org/sonar/python/checks/ArgumentTypeCheck.java

@@ -219,6 +219,6 @@ private static int firstParameterOffset(FunctionSymbol functionSymbol, boolean i
   private static boolean isException(InferredType inferredType) {
     return SymbolUtils.externalModulesSymbols().values()
       .stream().flatMap(Collection::stream)
-      .anyMatch(symbol -> inferredType.canBeOrExtend(symbol.fullyQualifiedName())) || inferredType.canBeOrExtend("unittest.Mock");
+      .anyMatch(symbol -> inferredType.canBeOrExtend(symbol.fullyQualifiedName())) || inferredType.canBeOrExtend("unittest.mock.Mock");
   }
 }

python-checks/src/test/resources/checks/argumentType.py

@@ -5,7 +5,7 @@
 import genericpath
 import _heapq
 import imaplib
-import unittest
+from unittest.mock import Mock
 from typing import Dict, Tuple, Set
 from collections import OrderedDict, Counter
 
@@ -163,6 +163,6 @@ def method_with_multiple_decorators(y: str): ...
   A.method_with_multiple_decorators(42) # OK, multiple decorators
 
 def exception_for_unittest_mock():
-  class SomeMock(unittest.Mock): ...
+  class SomeMock(Mock): ...
   my_mock = SomeMock()
   hex(my_mock) # OK