add test for show_config function

Author: jcapriot

tests/test_utils.py

@@ -1,8 +1,14 @@
 import numpy as np
+import geoana
 from geoana.utils import check_xyz_dim, mkvc, ndgrid
 import pytest
 
 
+def test_config_info():
+    info = geoana.show_config()
+    assert info['version'] == geoana.__version__
+
+
 def test_mkvc():
     x = np.random.rand(3, 2)
     x_test = np.concatenate((x[:, 0], x[:, 1]), axis=None)