Fix tests

src/python_spectrometer/daq/settings.py

@@ -239,13 +239,13 @@ class DAQSettings(dict):
             Consistency is not checked at instantiation time, only when using
             setters or converting to a plain consistent dictionary:
 
-            >>> s = DAQSettings(nperseg=400, fs=231.5, df=3.2)  # works
+            >>> s = DAQSettings(fs=1e3, f_max=1e3)  # works
             >>> s.to_consistent_dict()  #doctest: +NORMALIZE_WHITESPACE
             Traceback (most recent call last):
                 ...
             python_spectrometer.daq.settings.ResolutionError:
             Settings are inconsistent or not compatible with constraints.
-            Parsed so far: {'nperseg': 400, 'fs': 231.5, 'df': 3.2}
+            Parsed so far: {'fs': 1000.0, 'f_max': 1000.0, 'df': 1.0, 'nperseg': 1000}
 
             """
         )