test: add a test for a non-pickleable behaviour

tests/test_2770_serialize_and_deserialize_behaviour_for_numba.py

@@ -0,0 +1,27 @@
+# BSD 3-Clause License; see https://github.com/scikit-hep/awkward-1.0/blob/main/LICENSE
+
+import pytest
+
+import awkward as ak
+
+numba = pytest.importorskip("numba")
+
+
+def test_ArrayBuilder_inNumba():
+    SOME_ATTRS = {"FOO": "BAR"}
+    builder = ak.ArrayBuilder(behavior=SOME_ATTRS)
+
+    @numba.njit
+    def func(array):
+        return array
+
+    assert builder.behavior is SOME_ATTRS
+    # In Python, when we create a dictionary literal like {'FOO': 'BAR'}, it
+    # creates a new dictionary object. If we serialize this dictionary to
+    # a JSON string, or to a tuple and then deserialize it, we get a new dictionary
+    # object that is structurally identical to the original one, but it is not
+    # the same object in terms of identity.
+
+    # To check if two dictionaries are equal in terms of their contents,
+    # we should use the == operator instead of is.
+    assert func(builder).behavior == SOME_ATTRS