fixing test namings

Author: SwayamInSync

quaddtype/tests/test.py renamed to quaddtype/tests/test_arr.py

@@ -4,6 +4,6 @@
 from quaddtype import QuadPrecDType, QuadPrecision
 
 
-def test():
+def test_dtype():
     a = QuadPrecision("1.63")
     assert f"{np.array([a], dtype=QuadPrecDType).dtype}" == "QuadPrecDType()"