feat: bổ sung MIDI

tests/test_render_engine.py

@@ -0,0 +1,20 @@
+import os
+import json
+import pytest
+from app.core.render_engine import PythonRenderEngine
+
+def test_render_engine_init():
+    engine = PythonRenderEngine()
+    assert engine.sample_rate == 44100
+
+def test_bars_to_samples():
+    engine = PythonRenderEngine()
+    samples = engine.bars_to_samples(4.0, 120.0, 4)
+    assert samples == 352800
+
+def test_render_session_container_empty():
+    engine = PythonRenderEngine()
+    session = {"tracks": []}
+    buf = engine.render_session_container(session, {}, 120.0, 4, 1000)
+    assert buf.shape == (2, 1000)
+    assert (buf == 0.0).all()