diff --git a/deepblast/tests/test_nw.py b/deepblast/tests/test_nw.py
index c14c851..7f07ae8 100644
--- a/deepblast/tests/test_nw.py
+++ b/deepblast/tests/test_nw.py
@@ -79,5 +79,32 @@ def test_hessian_needlemanwunsch_function_Arand(self):
         gradgradcheck(needle, inputs, eps=1e-2)
 
 
+class TestRegressNeedlemanWunsch(unittest.TestCase):
+    def setUp(self):
+        torch.manual_seed(2)
+        # initialize random replacement costs [0,1]
+        self.theta = torch.rand(1,
+                                4,
+                                6,
+                                requires_grad=True,
+                                dtype=torch.float32).squeeze()
+        # define gap costs as -3, for theta + max... trick: compute A as follow
+        self.A = (torch.ones_like(self.theta) * -3) - self.theta
+        # external knowledge, only works for manual_seed(2)
+        self.exp_hardmax = -3.2049
+
+    def test_hardmax(self):
+        # TODO: use_numba is a global variable and I don't know how to change
+        # it to False for this test from this method.
+        needle = NeedlemanWunschDecoder('hardmax')
+        obs = needle(self.theta, self.A).detach().numpy()
+        self.assertAlmostEqual(self.exp_hardmax, obs, places=5)
+
+    def test_hardmax_numba(self):
+        needle = NeedlemanWunschDecoder('hardmax')
+        obs = needle(self.theta, self.A).detach().numpy()
+        self.assertAlmostEqual(self.exp_hardmax, obs, places=5)
+
+
 if __name__ == "__main__":
     unittest.main()