____________________ TestVariable.test_index_0d_not_a_time _____________________

self = <xarray.tests.test_units.TestVariable object at 0x7f3926b2ad00>

    def test_index_0d_not_a_time(self):
        d = np.datetime64("NaT", "ns")
        x = self.cls(["x"], [d])
>       self._assertIndexedLikeNDArray(x, d)

xarray/tests/test_variable.py:206: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <xarray.tests.test_units.TestVariable object at 0x7f3926b2ad00>
variable = <xarray.Variable (x: 1)>
<Quantity(['NaT'], 'meter')>
expected_value0 = numpy.datetime64('NaT'), expected_dtype = None

    def _assertIndexedLikeNDArray(self, variable, expected_value0, expected_dtype=None):
        """Given a 1-dimensional variable, verify that the variable is indexed
        like a numpy.ndarray.
        """
        assert variable[0].shape == ()
        assert variable[0].ndim == 0
        assert variable[0].size == 1
        # test identity
>       assert variable.equals(variable.copy())
E       AssertionError: assert False
E        +  where False = <bound method Variable.equals of <xarray.Variable (x: 1)>\n<Quantity(['NaT'], 'meter')>>(<xarray.Variable (x: 1)>\n<Quantity(['NaT'], 'meter')>)
E        +    where <bound method Variable.equals of <xarray.Variable (x: 1)>\n<Quantity(['NaT'], 'meter')>> = <xarray.Variable (x: 1)>\n<Quantity(['NaT'], 'meter')>.equals
E        +    and   <xarray.Variable (x: 1)>\n<Quantity(['NaT'], 'meter')> = <bound method Variable.copy of <xarray.Variable (x: 1)>\n<Quantity(['NaT'], 'meter')>>()
E        +      where <bound method Variable.copy of <xarray.Variable (x: 1)>\n<Quantity(['NaT'], 'meter')>> = <xarray.Variable (x: 1)>\n<Quantity(['NaT'], 'meter')>.copy

xarray/tests/test_variable.py:151: AssertionError
_____________________ TestVariable.test_equals_all_dtypes ______________________

self = <xarray.tests.test_units.TestVariable object at 0x7f39282b4e50>

    def test_equals_all_dtypes(self):
        for v, _ in self.example_1d_objects():
            v2 = v.copy()
>           assert v.equals(v2)
E           AssertionError: assert False
E            +  where False = <bound method Variable.equals of <xarray.Variable (x: 3)>\n<Quantity(['2000-01-01T00:00:00.000000000' '2000-01-02T00:00:00.000000000'\n '2000-01-03T00:00:00.000000000'], 'meter')>>(<xarray.Variable (x: 3)>\n<Quantity(['2000-01-01T00:00:00.000000000' '2000-01-02T00:00:00.000000000'\n '2000-01-03T00:00:00.000000000'], 'meter')>)
E            +    where <bound method Variable.equals of <xarray.Variable (x: 3)>\n<Quantity(['2000-01-01T00:00:00.000000000' '2000-01-02T00:00:00.000000000'\n '2000-01-03T00:00:00.000000000'], 'meter')>> = <xarray.Variable (x: 3)>\n<Quantity(['2000-01-01T00:00:00.000000000' '2000-01-02T00:00:00.000000000'\n '2000-01-03T00:00:00.000000000'], 'meter')>.equals

xarray/tests/test_variable.py:386: AssertionError