Create tests/test_core.py

tests/test_core.py

@@ -0,0 +1,7 @@
+import pytest
+from core_engine import harmonize_price
+
+def test_harmonize_basic():
+    out = harmonize_price(100, 80, 0.5)
+    assert out["harmonized_price"] < 100
+    assert 0 <= out["confidence"] <= 1