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test: cover CultGeometryGridEdge.Equals(object) behaviourally

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Mutating obj is CultGeometryGridEdge other && Equals(other) to && true
passed the suite: nothing exercised object.Equals directly with a mismatched
X/Y/Z/Axis, null, or an unrelated type. Add a behavioural test that checks
each component independently, rejects null and other types, and agrees with
the typed Equals and GetHashCode.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Meta Vens 2026-09-25 20:29:00 +02:00
commit b4db5cb6ed
1 changed files with 27 additions and 0 deletions
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27
tests/GameCult.Geometry.Tests/SurfaceNetsTests.cs
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@ -551,6 +551,33 @@ namespace GameCult.Geometry.Tests
(edge == new CultGeometryGridEdge(1, 2, 3, 1)).Should().BeFalse();
}
[Test]
public void Grid_edge_object_equals_distinguishes_every_component_and_rejects_null_and_other_types()
{
var edge = new CultGeometryGridEdge(1, 2, 3, 0);
object same = new CultGeometryGridEdge(1, 2, 3, 0);
object diffX = new CultGeometryGridEdge(9, 2, 3, 0);
object diffY = new CultGeometryGridEdge(1, 9, 3, 0);
object diffZ = new CultGeometryGridEdge(1, 2, 9, 0);
object diffAxis = new CultGeometryGridEdge(1, 2, 3, 1);
edge.Equals(same).Should().BeTrue();
edge.Equals(diffX).Should().BeFalse();
edge.Equals(diffY).Should().BeFalse();
edge.Equals(diffZ).Should().BeFalse();
edge.Equals(diffAxis).Should().BeFalse();
edge.Equals(null).Should().BeFalse();
edge.Equals("not an edge").Should().BeFalse();
edge.Equals((object)42).Should().BeFalse();
// object.Equals must agree with the typed Equals(CultGeometryGridEdge) it delegates to,
// and with GetHashCode wherever the two report equal, so the type is safe as a
// dictionary/set key (Extract uses it as one via vertexIndex's cell-coordinate tuples'
// sibling role, and tests key EdgeUsage dictionaries by it directly).
edge.Equals(same).Should().Be(edge.Equals((CultGeometryGridEdge)same));
edge.GetHashCode().Should().Be(((CultGeometryGridEdge)same).GetHashCode());
}
[Test]
public void Grid_edge_inequality_is_the_negation_of_equality()
{