src/main/python/tests/list/test_list_readwrite.py

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import shutil
import unittest

import numpy as np
from systemds.context import SystemDSContext


class TestListOperations(unittest.TestCase):

    sds: SystemDSContext = None
    temp_dir: str = "tests/list/tmp/readwrite/"

    @classmethod
    def setUpClass(cls):
        cls.sds = SystemDSContext(capture_stdout=True, logging_level=50)

    @classmethod
    def tearDownClass(cls):
        cls.sds.close()
        shutil.rmtree(cls.temp_dir)

    def test_write_followed_by_read(self):
        """Test write and read of lists variables in python.
        Since we do not support serializing a list (from java to python) yet we
        read and compute each list element when reading again
        """
        m1 = np.array([[1.0, 2.0, 3.0]])
        m1p = self.sds.from_numpy(m1)
        m2 = np.array([[4.0, 5.0, 6.0]])
        m2p = self.sds.from_numpy(m2)
        list_obj = self.sds.array(m1p, m2p)

        path = self.temp_dir + "01"
        list_obj.write(path).compute()
        ret_m1 = self.sds.read(path)[1].as_matrix().compute()
        ret_m2 = self.sds.read(path)[2].as_matrix().compute()
        self.assertTrue(np.allclose(m1, ret_m1))
        self.assertTrue(np.allclose(m2, ret_m2))


if __name__ == "__main__":
    unittest.main(exit=False)