public static void TestFindAll <Index2DCollection, FloatPredicate>(
RefMatrix4x4 matrix, FloatPredicate match, Index2DCollection expected)
where Index2DCollection : ICollection <Index2D>, new()
where FloatPredicate : struct, IPredicate <float>
=> CollectionAssert.AreEqual(expected, matrix.FindAllIndices <
float, Index2DCollection, RefMatrix4x4, FloatPredicate>(match));