Move text preprocessing tests into unittest directory

Author: yangarbiter

.circleci/unittest/linux/scripts/install.sh

@@ -56,7 +56,7 @@ fi
 (
     set -x
     conda install -y -c conda-forge ${NUMBA_DEV_CHANNEL} 'librosa>=0.8.0' parameterized 'requests>=2.20'
-    pip install kaldi-io SoundFile coverage pytest pytest-cov scipy transformers expecttest
+    pip install kaldi-io SoundFile coverage pytest pytest-cov scipy transformers expecttest unidecode inflect
 )
 # Install fairseq
 git clone https://github.com/pytorch/fairseq

.circleci/unittest/windows/scripts/install.sh

@@ -44,7 +44,7 @@ fi
 (
     set -x
     conda install -y -c conda-forge ${NUMBA_DEV_CHANNEL} 'librosa>=0.8.0' parameterized 'requests>=2.20'
-    pip install kaldi-io SoundFile coverage pytest pytest-cov scipy transformers expecttest
+    pip install kaldi-io SoundFile coverage pytest pytest-cov scipy transformers expecttest unidecode inflect
 )
 # Install fairseq
 git clone https://github.com/pytorch/fairseq

CONTRIBUTING.md

@@ -87,6 +87,8 @@ Optional packages to install if you want to run related tests:
 - `transformers`
 - `fairseq` (it has to be newer than `0.10.2`, so you will need to install from
   source. Commit `e6eddd80` is known to work.)
+- `unidecode` (dependency for testing text preprocessing functions for examples/pipeline_tacotron2)
+- `inflect` (dependency for testing text preprocessing functions for examples/pipeline_tacotron2)
 
 ## Development Process
 

examples/pipeline_tacotron2/text/test_text.py renamed to test/torchaudio_unittest/example/tacotron2/test_text_preprocessing.py

@@ -1,11 +1,15 @@
-import unittest
-
 from parameterized import parameterized
 
-from .text_preprocessing import text_to_sequence
+from torchaudio._internal.module_utils import is_module_available
+from torchaudio_unittest.common_utils import TorchaudioTestCase, skipIfNoModule
+
+if is_module_available("unidecode") and is_module_available("inflect"):
+    from pipeline_tacotron2.text.text_preprocessing import text_to_sequence
 
 
-class TestTextPreprocessor(unittest.TestCase):
+@skipIfNoModule("unidecode")
+@skipIfNoModule("infect")
+class TestTextPreprocessor(TorchaudioTestCase):
 
     @parameterized.expand(
         [