Use correct exception

Author: nfahlgren

tests/plantcv/test_readbayer.py

@@ -28,11 +28,11 @@ def test_readbayer_default_bad_input():
 
 def test_readbayer_bad_algorithm(test_data):
     """Test for PlantCV."""
-    with pytest.raises(ValueError):
+    with pytest.raises(RuntimeError):
         _, _, _ = readbayer(filename=test_data.bayer_img, bayerpattern="GR", alg="bad_algorithm")
 
 
 def test_readbayer_bad_bayerpattern(test_data):
     """Test for PlantCV."""
-    with pytest.raises(ValueError):
+    with pytest.raises(RuntimeError):
         _, _, _ = readbayer(filename=test_data.bayer_img, bayerpattern="bad_bayerpattern", alg="default")