[Nova] MacOS Unittests on Nova (#3324)

Summary:
As discussed in the [Torchaudio Migration Proposal](https://docs.google.com/document/d/1PF8biwiGzsjzfEBM78mlLiRrkcsGsvuYkeqkI66Ym8A/edit), this PR moves MacOS unittest job to Nova tooling. Note that this does not touch anything within the existing CircleCI job at the moment.

Passing job: https://github.com/pytorch/audio/actions/runs/4932497525/jobs/8815581251?pr=3324

Pull Request resolved: https://github.com/pytorch/audio/pull/3324

Reviewed By: atalman, mthrok

Differential Revision: D46113524

Pulled By: osalpekar

fbshipit-source-id: d048d300489f992fa187628cb6744d95ab4fb68a

.github/workflows/unittest-macos-cpu.yml

+name: Unit-tests on Macos CPU
+
+on:
+  pull_request:
+  push:
+    branches:
+      - nightly
+      - main
+      - release/*
+  workflow_dispatch:
+
+env:
+  CHANNEL: "nightly"
+
+jobs:
+  tests:
+    uses: pytorch/test-infra/.github/workflows/macos_job.yml@main
+    with:
+      runner: macos-12
+      repository: pytorch/audio
+      timeout: 180
+      script: |
+        echo '::group::Setup Environment Variables'
+        # Mark Build Directory Safe
+        git config --global --add safe.directory /__w/audio/audio
+
+        # Set up Environment Variables
+        export PYTHON_VERSION="3.8"
+        export CU_VERSION=""
+        export CUDATOOLKIT=""
+        export USE_FFMPEG="1"
+        export USE_OPENMP="0"
+
+        # Set CHANNEL
+        if [[(${GITHUB_EVENT_NAME} = 'pull_request' && (${GITHUB_BASE_REF} = 'release'*)) || (${GITHUB_REF} = 'refs/heads/release'*) ]]; then
+          export UPLOAD_CHANNEL=test
+        else
+          export UPLOAD_CHANNEL=nightly
+        fi
+
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_CMD_APPLY_CMVN_SLIDING=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_CMD_COMPUTE_FBANK_FEATS=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_CMD_COMPUTE_KALDI_PITCH_FEATS=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_CMD_COMPUTE_MFCC_FEATS=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_CMD_COMPUTE_SPECTROGRAM_FEATS=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_CUDA=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_HW_ACCEL=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_QUANTIZATION=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_ON_PYTHON_310=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_MOD_sentencepiece=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_AUDIO_OUT_DEVICE=true
+        echo '::endgroup::'
+
+        set -euxo pipefail
+
+        echo '::group::Setup Conda Environment'
+        ./.circleci/unittest/linux/scripts/setup_env.sh
+        echo '::endgroup::'
+
+        echo '::group::Install PyTorch and Torchaudio'
+        ./.circleci/unittest/linux/scripts/install.sh
+        echo '::endgroup::'
+
+        echo '::group::Run Tests'
+        ./.circleci/unittest/linux/scripts/run_test.sh
+        echo '::endgroup::'

test/torchaudio_unittest/common_utils/case_utils.py

@@ -67,7 +67,7 @@ class HttpServerMixin(TempDirMixin):
     """
 
     _proc = None
-    _port = 8000
+    _port = 12345
 
     @classmethod
     def setUpClass(cls):