Revert log() formatting; comment tests [ci skip]

Author: dhomeier

specutils/io/parsing_utils.py

@@ -99,8 +99,8 @@ def spectrum_from_column_mapping(table, column_mapping, wcs=None):
             kwarg_val = u.Quantity(table[col_name], tab_unit)
 
             # Attempt to convert the table unit to the user-defined unit.
-            log.debug(f"Attempting auto-convert of table unit {tab_unit} to "
-                      f"user-provided unit {cm_unit}.")
+            log.debug("Attempting auto-convert of table unit '%s' to "
+                      "user-provided unit '%s'.", tab_unit, cm_unit)
 
             if not isinstance(cm_unit, u.Unit):
                 cm_unit = u.Unit(cm_unit)

specutils/tests/test_loaders.py

@@ -522,6 +522,7 @@ def test_tabular_fits_writer(tmpdir, spectral_axis):
         spectrum.write(tmpfile, format='tabular-fits')
     spectrum.write(tmpfile, format='tabular-fits', overwrite=True)
 
+    # Map to alternative set of units
     cmap = {spectral_axis: ('spectral_axis', 'micron'),
             'flux': ('flux', 'erg / (s cm**2 AA)'),
             'uncertainty': ('uncertainty', None)}
@@ -565,7 +566,7 @@ def test_tabular_fits_multid(tmpdir, ndim, spectral_axis):
     assert quantity_allclose(spec.uncertainty.quantity,
                              spectrum.uncertainty.quantity)
 
-    # Test again, using `column_mapping` to convert to different flux unit
+    # Test again, using `column_mapping` to convert to different spectral axis and flux units
     cmap = {spectral_axis: ('spectral_axis', 'THz'),
             'flux': ('flux', 'erg / (s cm**2 AA)'),
             'uncertainty': ('uncertainty', None)}