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)