tests for error messages

Author: sbillinge

src/diffpy/labpdfproc/tests/test_tools.py

@@ -2,7 +2,7 @@
 
 import pytest
 
-from diffpy.labpdfproc.tools import set_wavelength
+from diffpy.labpdfproc.tools import WAVELENGTHS, set_wavelength
 
 params2 = [
     ([None, None], [0.71]),
@@ -21,14 +21,17 @@ def test_set_wavelength(inputs, expected):
 
 
 params3 = [
-    ([None, "invalid"]),
-    ([0, None]),
-    ([-1, "Mo"]),
+    (
+        [None, "invalid"],
+        [f"Anode type not recognized. please rerun specifying an anode_type from {*WAVELENGTHS, }"],
+    ),
+    ([0, None], ["No valid wavelength. Please rerun specifying a known anode_type or a positive wavelength"]),
+    ([-1, "Mo"], ["No valid wavelength. Please rerun specifying a known anode_type or a positive wavelength"]),
 ]
 
 
 @pytest.mark.parametrize("inputs", params3)
 def test_set_wavelength_bad(inputs):
+    actual_args = argparse.Namespace(wavelength=inputs[0], anode_type=inputs[1])
     with pytest.raises(ValueError):
-        actual_args = argparse.Namespace(wavelength=inputs[0], anode_type=inputs[1])
         actual_args.wavelength = set_wavelength(actual_args)