public void BorderValueTest()
{
var expected = 1f;
map.BorderValue = expected;
map.Clear(10f);
Assert.Equal(expected, map[-1, -1]);
Assert.Equal(expected, map[-1, 0]);
Assert.Equal(expected, map[-1, 1]);
Assert.Equal(expected, map[-1, 2]);
Assert.Equal(expected, map[2, -1]);
Assert.Equal(expected, map[2, 0]);
Assert.Equal(expected, map[2, 1]);
Assert.Equal(expected, map[2, 2]);
}