diff --git a/tests/text_tests/test_characters.py b/tests/text_tests/test_characters.py
index 3f4086d5..5432c652 100644
--- a/tests/text_tests/test_characters.py
+++ b/tests/text_tests/test_characters.py
@@ -1,15 +1,10 @@
 import unittest
 
-from TTS.tts.utils.text.characters import BaseCharacters, Graphemes, IPAPhonemes, create_graphemes, create_phonemes
+from TTS.tts.utils.text.characters import BaseCharacters, Graphemes, IPAPhonemes
 
 # pylint: disable=protected-access
 
 
-def test_make_symbols():
-    _ = create_phonemes()
-    _ = create_graphemes()
-
-
 class BaseCharacterTest(unittest.TestCase):
     def setUp(self):
         self.characters_empty = BaseCharacters("", "", pad="", eos="", bos="", blank="", is_unique=True, is_sorted=True)
diff --git a/tests/text_tests/test_tokenizer.py b/tests/text_tests/test_tokenizer.py
index 47174518..908952ea 100644
--- a/tests/text_tests/test_tokenizer.py
+++ b/tests/text_tests/test_tokenizer.py
@@ -64,6 +64,7 @@ class TestTTSTokenizer(unittest.TestCase):
     def test_init_from_config(self):
         @dataclass
         class Characters(Coqpit):
+            characters_class: str = None
             characters: str = _phonemes
             punctuations: str = _punctuations
             pad: str = _pad
diff --git a/tests/tts_tests/test_glow_tts.py b/tests/tts_tests/test_glow_tts.py
index 305f86b8..85b5ed7a 100644
--- a/tests/tts_tests/test_glow_tts.py
+++ b/tests/tts_tests/test_glow_tts.py
@@ -11,7 +11,7 @@ from TTS.tts.layers.losses import GlowTTSLoss
 from TTS.tts.models.glow_tts import GlowTTS
 from TTS.tts.utils.speakers import SpeakerManager
 from TTS.utils.audio import AudioProcessor
-from TTS.utils.logging.tensorboard_logger import TensorboardLogger
+from trainer.logging.tensorboard_logger import TensorboardLogger
 
 # pylint: disable=unused-variable
 
diff --git a/tests/vocoder_tests/test_multiband_melgan_train.py b/tests/vocoder_tests/test_multiband_melgan_train.py
index c49107bd..80027607 100644
--- a/tests/vocoder_tests/test_multiband_melgan_train.py
+++ b/tests/vocoder_tests/test_multiband_melgan_train.py
@@ -20,6 +20,7 @@ config = MultibandMelganConfig(
     eval_split_size=1,
     print_step=1,
     print_eval=True,
+    steps_to_start_discriminator=1,
     data_path="tests/data/ljspeech",
     discriminator_model_params={"base_channels": 16, "max_channels": 64, "downsample_factors": [4, 4, 4]},
     output_path=output_path,