test_core.py

import numpy as np
from tempfile import NamedTemporaryFile
import pickle
import unittest
import tfields

ATOL = 1e-8


class AbstractNdarray_Check(object):
    def demand_equal(self, other):
        raise NotImplementedError(self.__class__)

    def test_pickle(self):
        with NamedTemporaryFile(suffix='.pickle') as out_file:
            pickle.dump(self._inst,
                        out_file)
            out_file.flush()
            out_file.seek(0)
            reloaded = pickle.load(out_file)

        self.demand_equal(reloaded)

    def test_save_npz(self):
        out_file = NamedTemporaryFile(suffix='.npz')
        self._inst.save(out_file.name)
        _ = out_file.seek(0)  # this is only necessary in the test
        load_inst = self._inst.__class__.load(out_file.name)
        # allow_pickle=True)  ?

        self.demand_equal(load_inst)

    def tearDown(self):
        del self._inst


class Tensors_Check(AbstractNdarray_Check):
    """
    Testing derivatives of Tensors
    """
    _inst = None

    def demand_equal(self, other, atol=False, transformed=False):
        if atol:
            self.assertTrue(self._inst.equal(other, atol=ATOL))
        else:
            self.assertTrue(self._inst.equal(other))
        if not transformed:
            self.assertEqual(self._inst.coord_sys, other.coord_sys)
        self.assertEqual(self._inst.name, other.name)

    def test_self_equality(self):
        # Test equality
        self.demand_equal(self._inst)
        transformer = self._inst.copy()
        transformer.transform(tfields.bases.CYLINDER)
        self.demand_equal(transformer, atol=True, transformed=True)

    def test_cylinderTrafo(self):
        # Test coordinate transformations in circle
        transformer = self._inst.copy()
        transformer.transform(tfields.bases.CYLINDER)
        if len(self._inst) > 0:
            self.assertFalse(np.array_equal(self._inst, transformer))
        transformer.transform(tfields.bases.CARTESIAN)
        self.demand_equal(transformer, atol=True, transformed=True)

    def test_spericalTrafo(self):
        # Test coordinate transformations in circle
        transformer = self._inst.copy()
        transformer.transform(tfields.bases.SPHERICAL)
        transformer.transform(tfields.bases.CARTESIAN)
        self.demand_equal(transformer, atol=True, transformed=True)

    def test_basic_merge(self):
        # create 3 copies with different coord_sys
        merge_list = [self._inst.copy() for i in range(3)]
        merge_list[0].transform(tfields.bases.CARTESIAN)
        merge_list[1].transform(tfields.bases.CYLINDER)
        merge_list[2].transform(tfields.bases.SPHERICAL)

        # merge them and check that the first coord_sys is taken
        obj = type(self._inst).merged(*merge_list)
        self.assertTrue(obj.coord_sys == tfields.bases.CARTESIAN)

        # check that all copies are the same also with new coord_sys
        for i in range(len(merge_list)):
            value = np.allclose(merge_list[0],
                                obj[i * len(self._inst): (i + 1) *
                                    len(self._inst)],
                                atol=ATOL)
            self.assertTrue(value)

        obj_cs = type(self._inst).merged(*merge_list,
                                         coord_sys=tfields.bases.CYLINDER)
        for i in range(len(merge_list)):
            value = np.allclose(merge_list[1],
                                obj_cs[i * len(self._inst): (i + 1) *
                                       len(self._inst)],
                                atol=ATOL)
            self.assertTrue(value)


class TensorFields_Check(Tensors_Check):
    def test_fields(self):
        # field is of type list
        self.assertTrue(isinstance(self._inst.fields, list))
        self.assertTrue(len(self._inst.fields) == len(self._fields))

        for field, target_field in zip(self._inst.fields, self._fields):
            self.assertTrue(np.array_equal(field, target_field))
            # fields are copied not reffered by a pointer
            self.assertFalse(field is target_field)


class TensorMaps_Check(TensorFields_Check):
    def test_maps(self):
        self.assertIsNotNone(self._inst.maps)


"""
EMPTY TESTS
"""


class Tensors_Empty_Test(Tensors_Check, unittest.TestCase):
    def setUp(self):
        self._inst = tfields.Tensors([], dim=3)


class TensorFields_Empty_Test(TensorFields_Check, unittest.TestCase):
    def setUp(self):
        self._fields = []
        self._inst = tfields.TensorFields([], dim=3)


class TensorMaps_Empty_Test(TensorMaps_Check, unittest.TestCase):
    def setUp(self):
        self._fields = []
        self._inst = tfields.TensorMaps([], dim=3)
        self._maps = []
        self._maps_fields = []


class TensorFields_Copy_Test(TensorFields_Empty_Test):
    def setUp(self):
        base = [(-5, 5, 11)] * 3
        self._fields = [tfields.Tensors.grid(*base, coord_sys='cylinder'),
                        tfields.Tensors(range(11**3))]
        tensors = tfields.Tensors.grid(*base)
        self._inst = tfields.TensorFields(tensors, *self._fields)

        self.assertTrue(self._fields[0].coord_sys, 'cylinder')
        self.assertTrue(self._fields[1].coord_sys, 'cartesian')


class TensorMaps_Copy_Test(TensorMaps_Empty_Test):
    def setUp(self):
        base = [(-1, 1, 3)] * 3
        tensors = tfields.Tensors.grid(*base)
        self._fields = [tfields.Tensors.grid(*base, coord_sys='cylinder'),
                        tfields.Tensors(range(len(tensors)))]
        self._maps_tensors = [[[0, 0, 0],
                               [1, 2, 3],
                               [1, 5, 9]],
                              [[0, 4],
                               [1, 3]],
                              [[42]]]
        self._maps_fields = [[[42., 21., 11]],
                             [[3, 25]],
                             [[111]]]
        self._maps = [tfields.TensorFields(map_tensors,
                                           *map_fields) for map_tensors,
                      map_fields in zip(self._maps_tensors, self._maps_fields)]
        self._inst = tfields.TensorMaps(tensors, *self._fields,
                                        maps=self._maps)


class Container_Check(AbstractNdarray_Check):
    def demand_equal(self, other):
        raise NotImplementedError(self.__class__)

    def test_item(self):
        if len(self._inst.items) > 0:
            self.assertEqual(len(self._inst), len(self._inst))
            self.assertEqual(type(self._inst), type(self._inst))


class Container_Test(Container_Check, unittest.TestCase):
    def setUp(self):
        sphere = tfields.Mesh3D.grid(
            (1, 1, 1),
            (-np.pi, np.pi, 3),
            (-np.pi / 2, np.pi / 2, 3),
            coord_sys='spherical')
        sphere2 = sphere.copy() * 3
        self._inst = tfields.Container([sphere, sphere2])


class ContainerFolded_Test(Container_Check, unittest.TestCase):
    def setUp(self):
        sphere = tfields.Mesh3D.grid(
            (1, 1, 1),
            (-np.pi, np.pi, 3),
            (-np.pi / 2, np.pi / 2, 3),
            coord_sys='spherical')
        sphere2 = sphere.copy() * 3
        self._container = tfields.Container([sphere, sphere2])
        self._inst = tfields.Container(self._container)


if __name__ == '__main__':
    unittest.main()