test: quiet the test suites by quenching pointless DEBUG logs

audio_utils.py: we only ever want to see errors from pydub, no debug
info, so set the pydub.converter logger to WARNING.  This mostly has the
effect of quietting previously very verbose test suites, but in general
we just don't want to see DEBUG and INFO from pydub, WARNING and ERROR
messages are plenty.

basic_test_case.py: don't start by setting the log level to DEBUG, and
in tearDown(), when it's DEBUG reset it to INFO, so an individual case
can trigger DEBUG, e.g., with --debug, and test the effect, without
making the rest of the suite verbose.

remaining wish item I can't solve: test_force_align.py calls align_audio
with debug_aligner=True once, for coverage, but I cannot figure out how
to capture the logs from SoundSwallower, its own C stdout/stderr do not
seem to be redirectable from Python.

readalongs/audio_utils.py

@@ -4,12 +4,16 @@
 in millisecond slices and lets us manipulate them as if they were simple lists.
 """
 
+import logging
 from typing import Union
 
 from pydub import AudioSegment
 
 from readalongs.log import LOGGER
 
+# quiet pydub's logging
+logging.getLogger("pydub.converter").setLevel(logging.WARNING)
+
 
 def join_section(audio: AudioSegment, audio_to_insert: AudioSegment, start: int):
     """Given two AudioSegments, insert the second into the first at start (ms)"""

test/basic_test_case.py

@@ -1,5 +1,6 @@
 """Common base class for the ReadAlongs test suites"""
 
+import logging
 import tempfile
 from pathlib import Path
 from unittest import TestCase
@@ -20,7 +21,6 @@ class BasicTestCase(TestCase):
         text_file = self.data_dir / "ej-fra.txt"
     """
 
-    LOGGER.setLevel("DEBUG")
     data_dir = Path(__file__).parent / "data"
 
     # Set this to True to keep the temp dirs after running, for manual inspection
@@ -59,3 +59,9 @@ def tearDown(self):
         """
         if not self.keep_temp_dir_after_running:
             self.tempdirobj.cleanup()
+
+        if LOGGER.level == logging.DEBUG:
+            # LOGGER.error("Logging level is DEBUG")
+            # Some test cases can set the logging level to DEBUG when they pass
+            # --debug to a CLI command, but don't let that affect subsequent tests.
+            LOGGER.setLevel(logging.INFO)

test/test_force_align.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 
 """
-Test force-alignment with SoundsSwallower FSG search from Python API
+Test force-alignment with SoundSwallower FSG search from Python API
 """
 
 import os
@@ -26,7 +26,7 @@
 
 
 class TestForceAlignment(BasicTestCase):
-    """Unit testing suite for forced-alignment with SoundsSwallower"""
+    """Unit testing suite for forced-alignment with SoundSwallower"""
 
     def test_align(self):
         """Basic alignment test case with XML input"""