diff --git a/test/tts_pipeline/__init__.py b/test/tts_pipeline/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/test/__snapshots__/test_tts_engine/test_mocked_update_length_output.json b/test/tts_pipeline/__snapshots__/test_tts_engine/test_mocked_update_length_output.json
similarity index 100%
rename from test/__snapshots__/test_tts_engine/test_mocked_update_length_output.json
rename to test/tts_pipeline/__snapshots__/test_tts_engine/test_mocked_update_length_output.json
diff --git a/test/test_acoustic_feature_extractor.py b/test/tts_pipeline/test_acoustic_feature_extractor.py
similarity index 100%
rename from test/test_acoustic_feature_extractor.py
rename to test/tts_pipeline/test_acoustic_feature_extractor.py
diff --git a/test/test_kana_converter.py b/test/tts_pipeline/test_kana_converter.py
similarity index 100%
rename from test/test_kana_converter.py
rename to test/tts_pipeline/test_kana_converter.py
diff --git a/test/test_mora_list.py b/test/tts_pipeline/test_mora_list.py
similarity index 100%
rename from test/test_mora_list.py
rename to test/tts_pipeline/test_mora_list.py
diff --git a/test/test_mora_to_text.py b/test/tts_pipeline/test_mora_to_text.py
similarity index 100%
rename from test/test_mora_to_text.py
rename to test/tts_pipeline/test_mora_to_text.py
diff --git a/test/test_text_analyzer.py b/test/tts_pipeline/test_text_analyzer.py
similarity index 100%
rename from test/test_text_analyzer.py
rename to test/tts_pipeline/test_text_analyzer.py
diff --git a/test/test_tts_engine.py b/test/tts_pipeline/test_tts_engine.py
similarity index 100%
rename from test/test_tts_engine.py
rename to test/tts_pipeline/test_tts_engine.py
diff --git a/test/test_tts_engine_base.py b/test/tts_pipeline/test_tts_engine_base.py
similarity index 100%
rename from test/test_tts_engine_base.py
rename to test/tts_pipeline/test_tts_engine_base.py