message: Add test_error for DCT ops with n.
diff: @@ -150,6 +150,9 @@ class DCTOpsTest(parameterized.TestCase, test.TestCase):
  # Unsupported type.
  with self.assertRaises(ValueError):
  dct_ops.dct(signals, type=5)
  + # Invalid n.
  + with self.assertRaises(ValueError):
  + dct_ops.dct(signals, n=-2)
  # DCT-I normalization not implemented.
  with self.assertRaises(ValueError):
  dct_ops.dct(signals, type=1, norm="ortho")
  @@ -159,8 +162,6 @@ class DCTOpsTest(parameterized.TestCase, test.TestCase):
  # Unknown normalization.
  with self.assertRaises(ValueError):
  dct_ops.dct(signals, norm="bad")
  - with self.assertRaises(NotImplementedError):
  - dct_ops.dct(signals, n=10)
  with self.assertRaises(NotImplementedError):
  dct_ops.dct(signals, axis=0)
  