Remove unused mock object

Author: Cito

tests/pyutils/test_is_nullish.py

@@ -4,22 +4,6 @@
 from graphql.pyutils import is_nullish
 
 
-class FakeNumpyArray:
-    def __eq__(self, other):
-        # Numpy arrays return an array when compared with another numpy array
-        # containing the pointwise equality of the two
-        if isinstance(other, FakeNumpyArray):
-            return FakeNumpyArray()
-        else:
-            return False
-
-    def __bool__(self):
-        raise TypeError(
-            "The truth value of an array with more than one element is "
-            "ambiguous. Use a.any() or a.all()"
-        )
-
-
 def describe_is_nullish():
     def null_is_nullish():
         assert is_nullish(None) is True