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diff --git a/swh/provenance/tests/test_conflict_resolution.py b/swh/provenance/tests/test_conflict_resolution.py
new file mode 100644
--- /dev/null
+++ b/swh/provenance/tests/test_conflict_resolution.py
@@ -0,0 +1,143 @@
+# Copyright (C) 2021 The Software Heritage developers
+# See the AUTHORS file at the top-level directory of this distribution
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+from datetime import datetime
+from typing import List, Optional, Tuple, Union
+
+from swh.model.model import Sha1Git
+from swh.provenance.api.server import resolve_dates, resolve_relation, resolve_revision
+from swh.provenance.interface import RelationData, RevisionData
+
+
+def test_resolve_dates() -> None:
+ items: List[Union[Tuple[Sha1Git, Optional[datetime]], Tuple[Sha1Git]]] = [
+ (b"20329687bb9c1231a7e05afe86160343ad49b494",),
+ (
+ b"20329687bb9c1231a7e05afe86160343ad49b494",
+ datetime.fromtimestamp(1000000000),
+ ),
+ (b"20329687bb9c1231a7e05afe86160343ad49b494", None),
+ ]
+ assert resolve_dates(items) == {
+ b"20329687bb9c1231a7e05afe86160343ad49b494": datetime.fromtimestamp(1000000000)
+ }
+
+
+def test_resolve_dates_keep_min() -> None:
+ items: List[Union[Tuple[Sha1Git, Optional[datetime]], Tuple[Sha1Git]]] = [
+ (
+ b"20329687bb9c1231a7e05afe86160343ad49b494",
+ datetime.fromtimestamp(1000000001),
+ ),
+ (
+ b"20329687bb9c1231a7e05afe86160343ad49b494",
+ datetime.fromtimestamp(1000000000),
+ ),
+ ]
+ assert resolve_dates(items) == {
+ b"20329687bb9c1231a7e05afe86160343ad49b494": datetime.fromtimestamp(1000000000)
+ }
+
+
+def test_resolve_revision_without_date() -> None:
+ items: List[Union[Tuple[Sha1Git, RevisionData], Tuple[Sha1Git]]] = [
+ (b"c0d8929936631ecbcf9147be6b8aa13b13b014e4",),
+ (
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4",
+ RevisionData(date=None, origin=b"3acef14580ea7fd42840ee905c5ce2b0ef9e8175"),
+ ),
+ ]
+ assert resolve_revision(items) == {
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4": RevisionData(
+ date=None,
+ origin=b"3acef14580ea7fd42840ee905c5ce2b0ef9e8175",
+ )
+ }
+
+
+def test_resolve_revision_without_origin() -> None:
+ items: List[Union[Tuple[Sha1Git, RevisionData], Tuple[Sha1Git]]] = [
+ (b"c0d8929936631ecbcf9147be6b8aa13b13b014e4",),
+ (
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4",
+ RevisionData(date=datetime.fromtimestamp(1000000000), origin=None),
+ ),
+ ]
+ assert resolve_revision(items) == {
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4": RevisionData(
+ date=datetime.fromtimestamp(1000000000),
+ origin=None,
+ )
+ }
+
+
+def test_resolve_revision_merge() -> None:
+ items: List[Union[Tuple[Sha1Git, RevisionData], Tuple[Sha1Git]]] = [
+ (
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4",
+ RevisionData(date=datetime.fromtimestamp(1000000000), origin=None),
+ ),
+ (
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4",
+ RevisionData(date=None, origin=b"3acef14580ea7fd42840ee905c5ce2b0ef9e8175"),
+ ),
+ ]
+ assert resolve_revision(items) == {
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4": RevisionData(
+ date=datetime.fromtimestamp(1000000000),
+ origin=b"3acef14580ea7fd42840ee905c5ce2b0ef9e8175",
+ )
+ }
+
+
+def test_resolve_revision_keep_min_date() -> None:
+ items: List[Union[Tuple[Sha1Git, RevisionData], Tuple[Sha1Git]]] = [
+ (
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4",
+ RevisionData(
+ date=datetime.fromtimestamp(1000000000),
+ origin=b"3acef14580ea7fd42840ee905c5ce2b0ef9e8174",
+ ),
+ ),
+ (
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4",
+ RevisionData(
+ date=datetime.fromtimestamp(1000000001),
+ origin=b"3acef14580ea7fd42840ee905c5ce2b0ef9e8175",
+ ),
+ ),
+ ]
+ assert resolve_revision(items) == {
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4": RevisionData(
+ date=datetime.fromtimestamp(1000000000),
+ origin=b"3acef14580ea7fd42840ee905c5ce2b0ef9e8175",
+ )
+ }
+
+
+def test_resolve_relation() -> None:
+ items: List[Tuple[Sha1Git, Sha1Git, bytes]] = [
+ (
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4",
+ b"3acef14580ea7fd42840ee905c5ce2b0ef9e8174",
+ b"/path/1",
+ ),
+ (
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4",
+ b"3acef14580ea7fd42840ee905c5ce2b0ef9e8174",
+ b"/path/2",
+ ),
+ (
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4",
+ b"3acef14580ea7fd42840ee905c5ce2b0ef9e8174",
+ b"/path/1",
+ ),
+ ]
+ assert resolve_relation(items) == {
+ b"c0d8929936631ecbcf9147be6b8aa13b13b014e4": {
+ RelationData(b"3acef14580ea7fd42840ee905c5ce2b0ef9e8174", b"/path/1"),
+ RelationData(b"3acef14580ea7fd42840ee905c5ce2b0ef9e8174", b"/path/2"),
+ }
+ }

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