public void Neighbours_OnACube_ShouldHaveEachIndexAppearFourTimesTotal
(IPolyhedron polyhedron)
{
// Fixture setup
var expected = Enumerable.Repeat(Enumerable.Range(0, 6), 4).SelectMany(list => list).ToList();
// Exercise system
var neighbours = FaceIndexedTableFactory.Neighbours(polyhedron);
var actual = neighbours.SelectMany(list => list).ToList();
// Verify outcome
TestUtilities.WriteExpectedAndActual(expected, actual);
Assert.True(TestUtilities.UnorderedEquals(expected, actual));
// Teardown
}
public void Neighbours_OnACube_ShouldCreateSixListsOfFourElements
(IPolyhedron polyhedron)
{
// Fixture setup
var expected = Enumerable.Repeat(4, 6).ToList();
// Exercise system
var neighbours = FaceIndexedTableFactory.Neighbours(polyhedron);
var actual = neighbours.Select(list => list.Count()).ToList();
// Verify outcome
TestUtilities.WriteExpectedAndActual(expected, actual);
Assert.True(TestUtilities.UnorderedEquals(expected, actual));
// Teardown
}
public void Neighbours_OnACube_ShouldBeCommutative
(IPolyhedron polyhedron)
{
// Fixture setup
// Exercise system
var neighbourTable = FaceIndexedTableFactory.Neighbours(polyhedron);
// Verify outcome
for (int face = 0; face < neighbourTable.Length; face++)
{
foreach (var neighbour in neighbourTable[face])
{
Assert.Contains(face, neighbourTable[neighbour]);
}
}
// Teardown
}
public void Neighbours_OnACube_ShouldListNeighboursInAnticlockwiseOrder
(IPolyhedron polyhedron)
{
// Fixture setup
// Exercise system
var neighbourTable = FaceIndexedTableFactory.Neighbours(polyhedron);
// Verify outcome
for (int i = 0; i < neighbourTable.Length; i++)
{
var centerOfFace = polyhedron.Faces[i].SphericalCenter();
var viewVector = -centerOfFace.Normalize();
var neighbours = neighbourTable[i].Select(index => polyhedron.Faces[index]);
var centersOfNeighbours = neighbours.Select(neighbour => neighbour.SphericalCenter()).ToList();
Assert.True(TestUtilities.AreInAntiClockwiseOrder(centersOfNeighbours, centerOfFace, viewVector));
}
// Teardown
}
