public void TestSTPatchN()
{
using (var db = new PostGisTestDataConnection(TestDatabaseConnectionString))
{
const string Ewkt = @"POLYHEDRALSURFACE(
((0 0 0, 0 0 1, 0 1 1, 0 1 0, 0 0 0)),
((0 0 0, 0 1 0, 1 1 0, 1 0 0, 0 0 0)), ((0 0 0, 1 0 0, 1 0 1, 0 0 1, 0 0 0)),
((1 1 0, 1 1 1, 1 0 1, 1 0 0, 1 1 0)),
((0 1 0, 0 1 1, 1 1 1, 1 1 0, 0 1 0)), ((0 0 1, 1 0 1, 1 1 1, 0 1 1, 0 0 1)) )";
db.TestGeometries.Value(g => g.Id, 1).Value(g => g.Geometry, () => GeometryInput.STGeomFromEWKT(Ewkt)).Insert();
db.TestGeometries.Value(g => g.Id, 2).Value(g => g.Geometry, () => GeometryInput.STGeomFromText("POINT(1 1)")).Insert();
db.TestGeometries.Value(g => g.Id, 3).Value(g => g.Geometry, () => null).Insert();
Assert.AreEqual("POLYGON((0 0 0,0 1 0,1 1 0,1 0 0,0 0 0))", db.TestGeometries.Where(g => g.Id == 1).Select(g => g.Geometry.STPatchN(2).STAsEWKT()).Single());
Assert.IsNull(db.TestGeometries.Where(g => g.Id == 2).Select(g => g.Geometry.STPatchN(1)).Single());
Assert.IsNull(db.TestGeometries.Where(g => g.Id == 3).Select(g => g.Geometry.STPatchN(1)).Single());
Assert.AreEqual("POLYGON((0 0 0,0 1 0,1 1 0,1 0 0,0 0 0))", db.Select(() => GeometryAccessors.STPatchN(Ewkt, 2).STAsEWKT()));
}
}