How to use the pynwb.core.VectorData function in pynwb

def check_empty_table(self, table):
        self.assertIsInstance(table.columns[0], VectorData)
        self.assertEqual(len(table.columns), 3)
        self.assertEqual(table.colnames, ('foo', 'bar', 'baz'))

def test_constructor_ids_bad_ids(self):
        columns = [VectorData(name=s['name'], description=s['description'], data=d)
                   for s, d in zip(self.spec, self.data)]
        msg = "must provide same number of ids as length of columns"
        with self.assertRaisesRegex(ValueError, msg):
            DynamicTable("with_columns", 'a test table', id=[0, 1], columns=columns)

def test_nd_array_to_df(self):
        data = np.array([[1, 1, 1], [2, 2, 2], [3, 3, 3]])
        col = VectorData(name='name', description='desc', data=data)
        df = DynamicTable('test', 'desc', np.arange(3, dtype='int'), (col, )).to_dataframe()
        df2 = pd.DataFrame({'name': [x for x in data]},
                           index=pd.Index(name='id', data=[0, 1, 2]))
        assert_frame_equal(df, df2)

def test_constructor_ids(self):
        columns = [VectorData(name=s['name'], description=s['description'], data=d)
                   for s, d in zip(self.spec, self.data)]
        table = DynamicTable("with_columns", 'a test table', id=[0, 1, 2, 3, 4], columns=columns)
        self.check_table(table)

def with_table_columns(self):
        cols = [VectorData(**d) for d in self.spec]
        table = DynamicTable("with_table_columns", 'a test table', columns=cols)
        return table

def test_constructor_ids_bad_ids(self):
        columns = [VectorData(name=s['name'], description=s['description'], data=d)
                   for s, d in zip(self.spec, self.data)]
        msg = "must provide same number of ids as length of columns"
        with self.assertRaisesRegex(ValueError, msg):
            DynamicTable("with_columns", 'a test table', id=[0, 1], columns=columns)

def with_columns_and_data(self):
        columns = [
            VectorData(name=s['name'], description=s['description'], data=d)
            for s, d in zip(self.spec, self.data)
        ]
        return DynamicTable("with_columns_and_data", 'a test table', columns=columns)

def test_constructor_ids_default(self):
        columns = [VectorData(name=s['name'], description=s['description'], data=d)
                   for s, d in zip(self.spec, self.data)]
        table = DynamicTable("with_spec", 'a test table', columns=columns)
        self.check_table(table)

def with_columns_and_data(self):
        columns = [
            VectorData(name=s['name'], description=s['description'], data=d)
            for s, d in zip(self.spec, self.data)
        ]
        return DynamicTable("with_columns_and_data", 'a test table', columns=columns)