test: ensure that parameters are kept for NumpyArrays under ufunc operations

tests/test_1707-broadcast-parameters-ufunc.py

@@ -0,0 +1,65 @@
+# BSD 3-Clause License; see https://github.com/scikit-hep/awkward-1.0/blob/main/LICENSE
+
+import pytest  # noqa: F401
+
+import awkward as ak  # noqa: F401
+
+numpy = ak.nplike.Numpy.instance()
+
+
+def test_numpy_1d():
+    x = ak.Array(
+        ak.contents.NumpyArray(
+            numpy.array([1, 2, 3]),
+            parameters={"attrs": {"not": "hashable"}, "name": "x"},
+        )
+    )
+    y = ak.Array(
+        ak.contents.NumpyArray(
+            numpy.array([1, 2, 3]),
+            parameters={"attrs": {"not": "hashable"}, "name": "y"},
+        )
+    )
+    result = x + y
+    assert ak.parameters(result) == {"attrs": {"not": "hashable"}}
+
+
+def test_numpy_2d():
+    x = ak.Array(
+        ak.contents.NumpyArray(
+            numpy.array([[1, 2, 3]]),
+            parameters={"attrs": {"not": "hashable"}, "name": "x"},
+        )
+    )
+    y = ak.Array(
+        ak.contents.NumpyArray(
+            numpy.array([[1, 2, 3]]),
+            parameters={"attrs": {"not": "hashable"}, "name": "y"},
+        )
+    )
+    result = x + y
+    assert ak.parameters(result) == {"attrs": {"not": "hashable"}}
+
+
+def test_regular_array_numpy_1d():
+    x = ak.Array(
+        ak.contents.RegularArray(
+            ak.contents.NumpyArray(
+                numpy.array([1, 2, 3, 4, 5, 6]),
+                parameters={"attrs": {"not": "hashable"}, "name": "x"},
+            ),
+            3,
+        )
+    )
+    y = ak.Array(
+        ak.contents.RegularArray(
+            ak.contents.NumpyArray(
+                numpy.array([7, 8, 9, 10, 11, 12]),
+                parameters={"attrs": {"not": "hashable"}, "name": "y"},
+            ),
+            3,
+        )
+    )
+    result = x + y
+    assert result.layout.parameters == {}
+    assert result.layout.content.parameters == {"attrs": {"not": "hashable"}}

tests/test_1709-ak-array-constructor-behavior.py

@@ -1,8 +1,8 @@
 # BSD 3-Clause License; see https://github.com/scikit-hep/awkward-1.0/blob/main/LICENSE
 
 import pytest  # noqa: F401
-import awkward as ak  # noqa: F401
 
+import awkward as ak  # noqa: F401
 
 numpy = ak.nplike.Numpy.instance()