add test for BulkWriteResult reduction

tests/idiomatic/unit/test_bulk_write_results.py

@@ -0,0 +1,93 @@
+# Copyright DataStax, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import pytest
+
+from astrapy.idiomatic.results import BulkWriteResult
+from astrapy.idiomatic.operations import reduce_bulk_write_results
+
+
+class TestBulkWriteResults:
+    @pytest.mark.describe("test of reduction of bulk write results")
+    def test_reduce_bulk_write_results(self) -> None:
+        bwr1 = BulkWriteResult(
+            bulk_api_results={1: {"seq1": 1}},
+            deleted_count=100,
+            inserted_count=200,
+            matched_count=300,
+            modified_count=400,
+            upserted_count=500,
+            upserted_ids={1: {"useq1": 1}},
+        )
+        bwr2 = BulkWriteResult(
+            bulk_api_results={},
+            deleted_count=10,
+            inserted_count=20,
+            matched_count=30,
+            modified_count=40,
+            upserted_count=50,
+            upserted_ids={2: {"useq2": 2}},
+        )
+        bwr3 = BulkWriteResult(
+            bulk_api_results={3: {"seq3": 3}},
+            deleted_count=1,
+            inserted_count=2,
+            matched_count=3,
+            modified_count=4,
+            upserted_count=5,
+            upserted_ids={},
+        )
+
+        reduced_a = reduce_bulk_write_results([bwr1, bwr2, bwr3])
+        expected_a = BulkWriteResult(
+            bulk_api_results={1: {"seq1": 1}, 3: {"seq3": 3}},
+            deleted_count=111,
+            inserted_count=222,
+            matched_count=333,
+            modified_count=444,
+            upserted_count=555,
+            upserted_ids={1: {"useq1": 1}, 2: {"useq2": 2}},
+        )
+        assert reduced_a == expected_a
+
+        bwr_n = BulkWriteResult(
+            bulk_api_results={},
+            deleted_count=None,
+            inserted_count=0,
+            matched_count=0,
+            modified_count=0,
+            upserted_count=0,
+            upserted_ids={},
+        )
+        bwr_1 = BulkWriteResult(
+            bulk_api_results={},
+            deleted_count=1,
+            inserted_count=1,
+            matched_count=1,
+            modified_count=1,
+            upserted_count=1,
+            upserted_ids={},
+        )
+
+        reduced_n = reduce_bulk_write_results([bwr_1, bwr_n, bwr_1])
+        expected_n = BulkWriteResult(
+            bulk_api_results={},
+            deleted_count=None,
+            inserted_count=2,
+            matched_count=2,
+            modified_count=2,
+            upserted_count=2,
+            upserted_ids={},
+        )
+        assert reduced_n == expected_n