Jens
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129 lines
4.4 KiB
Python
129 lines
4.4 KiB
Python
"""Change detection must answer the question the operator actually asked.
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Every other analysis in the workbench is bounded by the drawn selection.
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Change detection was not: it compared two datasets in full, loaded every
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feature of both into Python, and — with ``include_unchanged`` defaulting to
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true — returned a FeatureCollection containing both datasets entire. For a
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regional building layer that is the wrong answer to "what changed here" and a
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response no browser should be asked to hold.
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"""
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from __future__ import annotations
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import pytest
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from shapely.geometry import box
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from app.core.errors import AppError
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from app.services.change_detection_service import ChangeDetectionService
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def _feature(feature_id: str, geometry):
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return {"feature_id": feature_id, "properties": {}, "geometry": geometry}
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INSIDE = box(0.0, 0.0, 1.0, 1.0)
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OUTSIDE = box(50.0, 50.0, 51.0, 51.0)
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SELECTION = box(-1.0, -1.0, 2.0, 2.0)
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def test_features_outside_the_selection_are_not_compared() -> None:
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kept = ChangeDetectionService.restrict_to_selection(
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[_feature("in", INSIDE), _feature("out", OUTSIDE)],
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SELECTION,
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)
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assert [item["feature_id"] for item in kept] == ["in"]
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def test_a_feature_crossing_the_selection_edge_is_kept_and_flagged() -> None:
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crossing = box(1.5, 1.5, 3.0, 3.0)
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kept = ChangeDetectionService.restrict_to_selection(
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[_feature("crossing", crossing)],
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SELECTION,
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)
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assert len(kept) == 1
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assert kept[0]["partially_covered"] is True
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# The geometry is not clipped: a change class describes a whole object, and
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# comparing a clipped 2020 footprint with an unclipped 2024 one would
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# invent change at the selection edge.
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assert kept[0]["geometry"].equals(crossing)
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def test_a_feature_wholly_inside_is_not_flagged() -> None:
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kept = ChangeDetectionService.restrict_to_selection([_feature("in", INSIDE)], SELECTION)
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assert kept[0]["partially_covered"] is False
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def test_no_selection_leaves_the_population_untouched() -> None:
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features = [_feature("in", INSIDE), _feature("out", OUTSIDE)]
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assert ChangeDetectionService.restrict_to_selection(features, None) == features
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def test_an_empty_intersection_is_an_explicit_error_not_a_silent_zero() -> None:
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with pytest.raises(AppError) as exc_info:
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ChangeDetectionService.restrict_to_selection([_feature("out", OUTSIDE)], SELECTION, label="Source")
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assert exc_info.value.code == "CHANGE_DETECTION_SELECTION_EMPTY"
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assert "Source" in exc_info.value.message
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def test_the_preview_is_capped_while_the_counts_stay_complete() -> None:
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features = [
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{
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"change_type": "added" if index % 2 else "removed",
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"geometry": box(index, 0, index + 1, 1),
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"source_feature_id": None,
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"target_feature_id": f"t{index}",
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"iou": None,
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"properties": {},
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}
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for index in range(250)
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]
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preview, truncated = ChangeDetectionService.limit_preview(features, limit=100)
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assert len(preview) == 100
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assert truncated is True
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def test_a_short_result_is_not_reported_as_truncated() -> None:
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features = [
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{
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"change_type": "added",
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"geometry": box(0, 0, 1, 1),
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"source_feature_id": None,
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"target_feature_id": "t",
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"iou": None,
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"properties": {},
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}
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]
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preview, truncated = ChangeDetectionService.limit_preview(features, limit=100)
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assert len(preview) == 1
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assert truncated is False
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def test_the_preview_prefers_changes_over_unchanged_features() -> None:
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"""A cap must not spend its budget on the least interesting class."""
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features = [
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{"change_type": "unchanged", "geometry": box(index, 0, index + 1, 1), "source_feature_id": f"s{index}",
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"target_feature_id": f"t{index}", "iou": 1.0, "properties": {}}
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for index in range(100)
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] + [
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{"change_type": "added", "geometry": box(0, 5, 1, 6), "source_feature_id": None,
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"target_feature_id": "new", "iou": None, "properties": {}},
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{"change_type": "modified", "geometry": box(0, 7, 1, 8), "source_feature_id": "s",
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"target_feature_id": "t", "iou": 0.6, "properties": {}},
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]
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preview, truncated = ChangeDetectionService.limit_preview(features, limit=3)
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assert truncated is True
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assert sorted(item["change_type"] for item in preview[:2]) == ["added", "modified"]
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