diff --git a/tests/test_factor_qs.py b/tests/test_factor_qs.py
new file mode 100644
index 0000000..36b0807
--- /dev/null
+++ b/tests/test_factor_qs.py
@@ -0,0 +1,9 @@
+import pytest
+from kryptools import is_prime
+from kryptools.factor_qs import factor_qs
+
+
+def test_qs():
+	for n in [ 832283, 2**32+1 ]:
+		m = factor_qs(n)
+		assert n % m == 0 and 1 < m and m < n