Add test for wake losses

Author: SabineHaas

tests/test_wake_losses.py

@@ -0,0 +1,24 @@
+import pandas as pd
+import numpy as np
+import pytest
+from pandas.util.testing import  assert_series_equal
+
+from windpowerlib.wake_losses import reduce_wind_speed, get_wind_efficiency_curve, display_wind_efficiency_curves
+import windpowerlib.wind_turbine as wt
+
+class TestWakeLosses:
+
+    def test_reduce_wind_speed(self):
+        parameters = {'wind_speed': pd.Series(np.arange(0, 26, 1.0)), 'wind_efficiency_curve_name': 'dena_mean'}
+        wind_speed_exp = pd.Series([
+            0.0, 0.9949534234119396, 1.9897327884892086, 2.9843374545454546, 3.807636264984227, 4.714931284760845,
+            5.642507531914893, 6.607021108049704, 7.592423167192429, 8.59498170212766, 9.606135658475111,
+            10.619828799086758, 11.641291957894737, 12.674012890137966, 13.709490666666666, 14.742508260567297,
+            15.773293013157893, 16.794615009724474, 17.817683032858028, 18.85294996704484, 19.86509539493748,
+            20.858807854510186, 21.854369681134507, 22.850700350710902, 23.85962037735849, 24.958125])
+        assert_series_equal(reduce_wind_speed(**parameters), wind_speed_exp)
+
+        # Raise ValueError - misspelling
+        with pytest.raises(ValueError):
+            parameters['wind_efficiency_curve_name'] = 'misspelled'
+            reduce_wind_speed(**parameters)