diff --git a/tests/unit/tts/test_losses.py b/tests/unit/tts/test_losses.py
index 4948b2065..26b1b20c2 100644
--- a/tests/unit/tts/test_losses.py
+++ b/tests/unit/tts/test_losses.py
@@ -31,10 +31,13 @@ def test_dac_losses():
         loss_1.backward()
         loss_1_grad = signal.audio_data.grad.sum()
 
-        assert abs((loss_1.item() - loss_origin['stft/loss'].item()) /
-                   loss_1.item()) < 1e-5
-        assert abs((loss_1_grad.item() - loss_origin['stft/grad'].sum().item())
-                   / loss_1_grad.item()) < 1e-5
+        assert abs(
+            (loss_1.item() - loss_origin['stft/loss'].item()) /
+            loss_1.item()) < 1e-5, r"value incorrect for 'MultiScaleSTFTLoss'"
+        assert abs(
+            (loss_1_grad.item() - loss_origin['stft/grad'].sum().item()
+             ) / loss_1_grad.
+            item()) < 1e-5, r"gradient incorrect for 'MultiScaleSTFTLoss'"
 
         signal.audio_data.clear_grad()
         recons.audio_data.clear_grad()
@@ -43,11 +46,13 @@ def test_dac_losses():
         loss_2.backward()
         loss_2_grad = signal.audio_data.grad.sum()
 
-        assert abs((loss_2.item() - loss_origin['mel/loss'].item()) /
-                   loss_2.item()) < 1e-5
+        assert abs(
+            (loss_2.item() - loss_origin['mel/loss'].item()) / loss_2.
+            item()) < 1e-5, r"value incorrect for 'MultiMelSpectrogramLoss'"
         assert abs(
             (signal.audio_data.grad.sum().item() -
-             loss_origin['mel/grad'].sum().item()) / loss_2_grad.item()) < 1e-5
+             loss_origin['mel/grad'].sum().item()) / loss_2_grad.
+            item()) < 1e-5, r"gradient incorrect for 'MultiMelSpectrogramLoss'"
 
         signal.audio_data.clear_grad()
         recons.audio_data.clear_grad()
@@ -60,10 +65,11 @@ def test_dac_losses():
         loss_1.backward()
         loss_1_grad = signal.audio_data.grad.sum()
 
-        assert abs(loss_1.item() - loss_origin['stft/loss']
-                   .item()) / loss_1.item() < 1e-5
+        assert abs(loss_1.item() - loss_origin['stft/loss'].item(
+        )) / loss_1.item() < 1e-5, r"value incorrect for 'MultiScaleSTFTLoss'"
         assert abs(loss_1_grad.item() - loss_origin['stft/grad'].sum()
-                   .item()) / loss_1_grad.item() < 1e-5
+                   .item()) / loss_1_grad.item(
+                   ) < 1e-5, r"gradient incorrect for 'MultiScaleSTFTLoss'"
 
         signal.audio_data.clear_grad()
         recons.audio_data.clear_grad()
@@ -72,7 +78,10 @@ def test_dac_losses():
         loss_2.backward()
         loss_2_grad = signal.audio_data.grad.sum()
 
-        assert abs((loss_2.item() - loss_origin['mel/loss'].item()) /
-                   loss_2.item()) < 1e-5
-        assert abs((loss_2_grad.item() - loss_origin['mel/grad'].sum().item()) /
-                   loss_2_grad.item()) < 1e-5
+        assert abs(
+            (loss_2.item() - loss_origin['mel/loss'].item()) / loss_2.
+            item()) < 1e-5, r"value incorrect for 'MultiMelSpectrogramLoss'"
+        assert abs(
+            (loss_2_grad.item() - loss_origin['mel/grad'].sum().item()
+             ) / loss_2_grad.
+            item()) < 1e-5, r"gradient incorrect for 'MultiMelSpectrogramLoss'"