Numbers outside of the map [still cluttered]

tests/test_outside_indices.py

@@ -0,0 +1,73 @@
+from unittest.mock import Mock
+from xml.etree import ElementTree as ET
+
+import pytest
+from shapely.geometry import box
+from shapely.geometry.base import BaseGeometry
+
+from flight_map.curves import interpolate
+from flight_map.plot import SVG_NS, outside_index
+
+
+@pytest.mark.parametrize(
+    "points",
+    [
+        [(0, 50), (100, 50)],
+        [(50, 0), (50, 100)],
+        [(20, 30), (60, 40)],
+        [(0, 0), (100, 100)],
+    ],
+)
+@pytest.mark.parametrize("text", ["1", "12", "123"])
+def test_indices_are_outside_map_and_inside_page(
+    points: list[tuple[float, float]],
+    text: str,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    group = ET.Element("g")
+    map_rectangle = box(10, 10, 90, 90)
+    outer_rectangle = box(4, 4, 96, 96)
+    occupied: list[BaseGeometry] = []
+    draw = Mock()
+    monkeypatch.setattr("flight_map.plot.label", draw)
+    outside_index(
+        group, text, interpolate(points), map_rectangle, outer_rectangle, occupied, 1.8, 0.3
+    )
+    assert len(occupied) == 1
+    assert occupied[0].disjoint(map_rectangle)
+    assert outer_rectangle.covers(occupied[0])
+    draw.assert_called_once()
+    assert group.find(f"{{{SVG_NS}}}path") is not None  # Vector leader line.
+
+
+def test_nearby_indices_do_not_overlap(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setattr("flight_map.plot.label", Mock())
+    occupied: list[BaseGeometry] = []
+    curves = interpolate([(0, 50), (100, 50)])
+    for index in range(1, 7):
+        outside_index(
+            ET.Element("g"),
+            str(index),
+            curves,
+            box(10, 10, 90, 90),
+            box(6, 6, 94, 94),
+            occupied,
+            1.8,
+            0.3,
+        )
+    for index, extent in enumerate(occupied):
+        assert all(extent.disjoint(other) for other in occupied[index + 1 :])
+
+
+def test_too_narrow_margin_fails_instead_of_putting_index_inside() -> None:
+    with pytest.raises(ValueError, match="outside the map"):
+        outside_index(
+            ET.Element("g"),
+            "12",
+            interpolate([(0, 50), (100, 50)]),
+            box(10, 10, 90, 90),
+            box(9.9, 9.9, 90.1, 90.1),
+            [],
+            1.8,
+            0.3,
+        )