wip: silence the test_force_align unit test suite

test/test_force_align.py

@@ -4,8 +4,11 @@
 Test force-alignment with SoundSwallower FSG search from Python API
 """
 
+import contextlib
+import io
 import os
 import shutil
+import sys
 import unittest
 import wave
 from tempfile import TemporaryDirectory
@@ -25,14 +28,34 @@
 from readalongs.text.util import load_txt, load_xml, save_xml
 
 
+@contextlib.contextmanager
+def capture_stderr():
+    f = io.StringIO()
+    with contextlib.redirect_stderr(f):
+        yield f
+
+
+@contextlib.contextmanager
+def capture_c_stderr():
+    stderr_fileno = sys.stderr.fileno()
+    stderr_save = os.dup(stderr_fileno)
+    stderr_fd = os.open(os.devnull, os.O_RDWR)
+    os.dup2(stderr_fd, stderr_fileno)
+    yield
+    os.dup2(stderr_save, stderr_fileno)
+    os.close(stderr_save)
+    os.close(stderr_fd)
+
+
 class TestForceAlignment(BasicTestCase):
     """Unit testing suite for forced-alignment with SoundSwallower"""
 
     def test_align(self):
         """Basic alignment test case with XML input"""
         xml_path = os.path.join(self.data_dir, "ej-fra.readalong")
         wav_path = os.path.join(self.data_dir, "ej-fra.m4a")
-        results = align_audio(xml_path, wav_path, unit="w", debug_aligner=True)
+        with capture_stderr(), capture_c_stderr():
+            results = align_audio(xml_path, wav_path, unit="w", debug_aligner=True)
 
         # Verify that the same IDs are in the output
         converted_path = os.path.join(self.data_dir, "ej-fra-converted.readalong")
@@ -50,7 +73,8 @@ def test_align_text(self):
         _, temp_fn = create_input_ras(
             input_file_name=txt_path, text_languages=("fra",), save_temps=None
         )
-        results = align_audio(temp_fn, wav_path, unit="w", save_temps=None)
+        with capture_stderr():
+            results = align_audio(temp_fn, wav_path, unit="w", save_temps=None)
 
         # Verify that the same IDs are in the output
         converted_path = os.path.join(self.data_dir, "ej-fra-converted.readalong")
@@ -131,14 +155,22 @@ def test_align_switch_am(self):
             with open(os.path.join(custom_am_path, "noisedict"), "at") as fh:
                 fh.write(";; here is a comment\n")
                 fh.write("[BOGUS] SIL\n")
-            results = align_audio(
-                xml_path, wav_path, unit="w", config={"acoustic_model": custom_am_path}
-            )
+            with capture_stderr():
+                results = align_audio(
+                    xml_path,
+                    wav_path,
+                    unit="w",
+                    config={"acoustic_model": custom_am_path},
+                )
             # Try with no noisedict
             os.remove(os.path.join(custom_am_path, "noisedict"))
-            results = align_audio(
-                xml_path, wav_path, unit="w", config={"acoustic_model": custom_am_path}
-            )
+            with capture_stderr():
+                results = align_audio(
+                    xml_path,
+                    wav_path,
+                    unit="w",
+                    config={"acoustic_model": custom_am_path},
+                )
         # Verify that the same IDs are in the output
         converted_path = os.path.join(self.data_dir, "ej-fra-converted.readalong")
         xml = load_xml(converted_path)
@@ -157,11 +189,11 @@ def test_align_fail(self):
                 writer.setsampwidth(2)
                 writer.setframerate(16000)
                 writer.writeframes(b"\x00\x00")
-            with self.assertRaises(RuntimeError):
+            with self.assertRaises(RuntimeError), capture_stderr():
                 _ = align_audio(xml_path, tf.name, unit="w")
 
     def test_bad_align_mode(self):
-        with self.assertRaises(AssertionError):
+        with self.assertRaises(AssertionError), capture_stderr():
             _ = align_audio(
                 os.path.join(self.data_dir, "ej-fra.readalong"),
                 os.path.join(self.data_dir, "noise.mp3"),