public void Flatten_SetsAllMapDataToZero()
{
// Arrange
var source = new double[, ] {
{ 1d, 2d }, { 3d, 4d }
};
var expected = new double[, ] {
{ 0d, 0d }, { 0d, 0d }
};
var map = new HeightMap(source);
// Act
map.Flatten();
// Assert
Assert.Equal(expected, map.Data);
}