add taylor test

tests/test_taylor.py

@@ -0,0 +1,40 @@
+import pytest
+import matplotlib as mpl
+import matplotlib.pyplot as plt
+import numpy as np
+
+import geocat.viz as gv
+
+@pytest.mark.mpl_image_compare
+def test_plot():
+    fig = plt.figure(figsize=(10, 10))
+    taylor = gv.TaylorDiagram(fig=fig, label='REF')
+
+    taylor.add_corr_grid(np.array([0.6, 0.9]))
+
+    taylor.add_model_set([1.230, 0.988, 1.092],
+                    [0.958, 0.973, 0.740],
+                    percent_bias_on=True, # indicate marker and size to be plotted based on bias_array
+                    bias_array=[2.7, -1.5, 17.31], # specify bias array
+                    color='red',
+                    label='Model A',
+                    fontsize=16)
+
+    taylor.add_model_set([1.129, 0.996, 1.016],
+                    [0.963, 0.975, 0.801],
+                    percent_bias_on=True,
+                    bias_array=[1.7, 2.5, -17.31],
+                    color='blue',
+                    label='Model B',
+                    fontsize=16)
+
+    taylor.add_model_name(['a', 'b', 'c'], fontsize=16)
+
+    taylor.add_legend(fontsize=16)
+
+    taylor.add_bias_legend()
+
+    taylor.add_contours(levels=np.arange(0, 1.1, 0.25),
+                    colors='lightgrey',
+                    linewidths=0.5);
+    return fig