rename test for conversion.db

src/tests/test_conversion/test_db/test_db.py

@@ -5,7 +5,7 @@ import numpy as np
 from openqlab.conversion import db
 
 
-class TestModematching(unittest.TestCase):
+class TestDB(unittest.TestCase):
     def test_db_to_lin(self):
         self.assertAlmostEqual(db.to_lin(20), 100)
         self.assertAlmostEqual(db.to_lin(100), 1e10)