Fix import of pandas testing

Author: birgits

tests/test_density.py

@@ -5,7 +5,7 @@
 
 import pandas as pd
 import numpy as np
-from pandas.util.testing import assert_series_equal
+from pandas.testing import assert_series_equal
 from numpy.testing import assert_allclose
 
 from windpowerlib.density import barometric, ideal_gas

tests/test_modelchain.py

@@ -7,7 +7,7 @@
 import pandas as pd
 import numpy as np
 import pytest
-from pandas.util.testing import assert_series_equal
+from pandas.testing import assert_series_equal
 
 import windpowerlib.wind_turbine as wt
 import windpowerlib.modelchain as mc

tests/test_power_curves.py

@@ -6,7 +6,7 @@
 import pandas as pd
 import numpy as np
 import pytest
-from pandas.util.testing import assert_frame_equal
+from pandas.testing import assert_frame_equal
 
 from windpowerlib.power_curves import (
     smooth_power_curve,

tests/test_power_output.py

@@ -8,7 +8,7 @@
 import pandas as pd
 import pytest
 from numpy.testing import assert_allclose
-from pandas.util.testing import assert_series_equal
+from pandas.testing import assert_series_equal
 from windpowerlib.power_output import (
     power_coefficient_curve,
     power_curve,

tests/test_temperature.py

@@ -5,7 +5,7 @@
 
 import pandas as pd
 import numpy as np
-from pandas.util.testing import assert_series_equal
+from pandas.testing import assert_series_equal
 from numpy.testing import assert_array_equal
 
 from windpowerlib.temperature import linear_gradient

tests/test_tools.py

@@ -4,7 +4,7 @@
 """
 
 import pandas as pd
-from pandas.util.testing import assert_series_equal
+from pandas.testing import assert_series_equal
 
 from windpowerlib.tools import (
     linear_interpolation_extrapolation,

tests/test_turbine_cluster_modelchain.py

@@ -6,7 +6,7 @@
 import pytest
 import pandas as pd
 import numpy as np
-from pandas.util.testing import assert_series_equal
+from pandas.testing import assert_series_equal
 
 import windpowerlib.wind_farm as wf
 import windpowerlib.wind_turbine as wt

tests/test_wake_losses.py

@@ -6,7 +6,7 @@
 import pandas as pd
 import numpy as np
 import pytest
-from pandas.util.testing import assert_series_equal
+from pandas.testing import assert_series_equal
 
 from windpowerlib.wake_losses import (
     reduce_wind_speed,

tests/test_wind_speed.py

@@ -6,7 +6,7 @@
 import pandas as pd
 import numpy as np
 import pytest
-from pandas.util.testing import assert_series_equal
+from pandas.testing import assert_series_equal
 from numpy.testing import assert_allclose
 
 from windpowerlib.wind_speed import logarithmic_profile, hellman