public void Test_S2CellId_MaximumTile()
{
// This method is tested more thoroughly in s2cell_union_test.cc.
for (int iter = 0; iter < 1000; ++iter)
{
S2CellId id = S2Testing.GetRandomCellId(10);
// Check that "limit" is returned for tiles at or beyond "limit".
Assert.Equal(id, id.MaximumTile(id));
Assert.Equal(id, id.Child(0).MaximumTile(id));
Assert.Equal(id, id.Child(1).MaximumTile(id));
Assert.Equal(id, id.Next().MaximumTile(id));
Assert.Equal(id.Child(0), id.MaximumTile(id.Child(0)));
// Check that the tile size is increased when possible.
Assert.Equal(id, id.Child(0).MaximumTile(id.Next()));
Assert.Equal(id, id.Child(0).MaximumTile(id.Next().Child(0)));
Assert.Equal(id, id.Child(0).MaximumTile(id.Next().Child(1).Child(0)));
Assert.Equal(id, id.Child(0).Child(0).MaximumTile(id.Next()));
Assert.Equal(id, id.Child(0).Child(0).Child(0).MaximumTile(id.Next()));
// Check that the tile size is decreased when necessary.
Assert.Equal(id.Child(0), id.MaximumTile(id.Child(0).Next()));
Assert.Equal(id.Child(0), id.MaximumTile(id.Child(0).Next().Child(0)));
Assert.Equal(id.Child(0), id.MaximumTile(id.Child(0).Next().Child(1)));
Assert.Equal(id.Child(0).Child(0),
id.MaximumTile(id.Child(0).Child(0).Next()));
Assert.Equal(id.Child(0).Child(0).Child(0),
id.MaximumTile(id.Child(0).Child(0).Child(0).Next()));
// Check that the tile size is otherwise unchanged.
Assert.Equal(id, id.MaximumTile(id.Next()));
Assert.Equal(id, id.MaximumTile(id.Next().Child(0)));
Assert.Equal(id, id.MaximumTile(id.Next().Child(1).Child(0)));
}
}
