Move test location

The newly added tests no longer require `sox` CLI, thus it is better
located at transforms_test.

Author: mthrok

test/torchaudio_unittest/transforms/sox_compatibility_test.py

@@ -70,18 +70,6 @@ def test_vad(self, filename):
         result = T.Vad(sample_rate)(data)
         self.assert_sox_effect(result, path, ["vad"])
 
-    @parameterized.expand(
-        [
-            (torch.zeros(32000), torch.zeros(0), 16000),
-            (torch.zeros(1, 32000), torch.zeros(1, 0), 32000),
-            (torch.zeros(2, 44100), torch.zeros(2, 0), 32000),
-            (torch.zeros(2, 2, 44100), torch.zeros(2, 2, 0), 32000),
-        ]
-    )
-    def test_vad_on_zero_audio(self, inpt: torch.Tensor, expected_output: torch.Tensor, sample_rate: int):
-        result = T.Vad(sample_rate)(inpt)
-        self.assertEqual(result, expected_output)
-
     def test_vad_warning(self):
         """vad should throw a warning if input dimension is greater than 2"""
         sample_rate = 41100

test/torchaudio_unittest/transforms/transforms_test_impl.py

@@ -478,3 +478,18 @@ def test_specaugment(self, n_time_masks, time_mask_param, n_freq_masks, freq_mas
             self.assertTrue(diff > 0)
         else:
             self.assertTrue(diff == 0)
+
+    @parameterized.expand(
+        [
+            ((32000,), (0,), 16000),
+            ((1, 32000), (1, 0), 32000),
+            ((2, 44100), (2, 0), 32000),
+            ((2, 2, 44100), (2, 2, 0), 32000),
+        ]
+    )
+    def test_vad_on_zero_audio(self, input_shape, output_shape, sample_rate: int):
+        """VAD should return zero when input is zero Tensor"""
+        inpt = torch.zeros(input_shape, dtype=self.dtype, device=self.device)
+        expected_output = torch.zeros(output_shape, dtype=self.dtype, device=self.device)
+        result = T.Vad(sample_rate)(inpt)
+        self.assertEqual(result, expected_output)