def test_basic(self):
"""Test a (0, 0) coordinate conversion to geocentric cartesian. This is
expected to give an x coordinate which is the semi-major axis of the
globe defined in the global coordinate system."""
plugin = NeighbourSelection()
x_points = np.array([0])
y_points = np.array([0])
result = plugin.geocentric_cartesian(self.global_orography, x_points, y_points)
radius = self.global_orography.coord_system().semi_major_axis
expected = [[radius, 0, 0]]
self.assertArrayAlmostEqual(result, expected)
