def test_change_grid():
grid = Grid(extent=(8, 6), gpts=10)
grid.sampling = .2
assert (grid.extent[0] == 8.) & (grid.extent[1] == 6.)
assert (grid.gpts[0] == 40) & (grid.gpts[1] == 30)
grid.gpts = 100
assert (grid.extent[0] == 8.) & (grid.extent[1] == 6.)
assert (grid.sampling[0] == .08) & (grid.sampling[1] == .06)
grid.extent = (16, 12)
assert (grid.gpts[0] == 100) & (grid.gpts[1] == 100)
assert (grid.extent[0] == 16.) & (grid.extent[1] == 12.)
assert (grid.sampling[0] == .16) & (grid.sampling[1] == .12)
grid.extent = (10, 10)
assert (grid.sampling[0] == grid.extent[0] /
grid.gpts[0]) & (grid.sampling[1] == grid.extent[1] / grid.gpts[1])
grid.sampling = .3
assert (grid.extent[0] == grid.sampling[0] *
grid.gpts[0]) & (grid.extent[1] == grid.sampling[1] * grid.gpts[1])
grid.gpts = 30
assert (grid.sampling[0] == grid.extent[0] /
grid.gpts[0]) & (grid.sampling[1] == grid.extent[1] / grid.gpts[1])
def test_grid_event():
grid = Grid()
grid.extent = 5
assert grid.changed._notify_count == 1
grid.gpts = 100
assert grid.changed._notify_count == 2
grid.sampling = .1
assert grid.changed._notify_count == 3
def test_locked_grid():
grid = Grid(gpts=200, lock_gpts=True)
grid.extent = 10
assert (grid.sampling[0] == .05) & (grid.sampling[1] == .05)
grid.extent = 20
assert (grid.sampling[0] == .1) & (grid.sampling[1] == .1)
with pytest.raises(RuntimeError) as e:
grid.gpts = 100
assert str(e.value) == 'gpts cannot be modified'