diff --git a/normflows/flows/affine/coupling_test.py b/normflows/flows/affine/coupling_test.py
new file mode 100644
index 0000000..6584ac2
--- /dev/null
+++ b/normflows/flows/affine/coupling_test.py
@@ -0,0 +1,46 @@
+import unittest
+import torch
+
+from torch.testing import assert_close
+from normflows.flows import MaskedAffineFlow, CCAffineConst
+from normflows.nets import MLP
+from normflows.flows.flow_test import FlowTest
+
+
+class CouplingTest(FlowTest):
+    def test_mask_affine(self):
+        batch_size = 5
+        for latent_size in [2, 7]:
+            with self.subTest(latent_size=latent_size):
+                b = torch.Tensor([1 if i % 2 == 0 else 0 for i in range(latent_size)])
+                s = MLP([latent_size, 2 * latent_size, latent_size], init_zeros=True)
+                t = MLP([latent_size, 2 * latent_size, latent_size], init_zeros=True)
+                flow = MaskedAffineFlow(b, t, s)
+                inputs = torch.randn((batch_size, latent_size))
+                self.checkForwardInverse(flow, inputs)
+
+    def test_cc_affine(self):
+        batch_size = 5
+        for shape in [(5,), (2, 3, 4)]:
+            for num_classes in [2, 5]:
+                with self.subTest(shape=shape, num_classes=num_classes):
+                    flow = CCAffineConst(shape, num_classes)
+                    x = torch.randn((batch_size,) + shape)
+                    y = torch.rand((batch_size,) + (num_classes,))
+                    x_, log_det = flow(x, y)
+                    x__, log_det_ = flow(x_, y)
+
+                    assert x_.dtype == x.dtype
+                    assert x__.dtype == x.dtype
+
+                    assert x_.shape == x.shape
+                    assert x__.shape == x.shape
+
+                    assert_close(x__, x)
+                    id_ld = log_det + log_det_
+                    assert_close(id_ld, torch.zeros_like(id_ld))
+
+
+
+if __name__ == "__main__":
+    unittest.main()
\ No newline at end of file
diff --git a/normflows/flows/affine/glow_test.py b/normflows/flows/affine/glow_test.py
index b9129d3..79a809b 100644
--- a/normflows/flows/affine/glow_test.py
+++ b/normflows/flows/affine/glow_test.py
@@ -1,5 +1,4 @@
 import unittest
-
 import torch
 
 from normflows.flows import GlowBlock
diff --git a/normflows/flows/flow_test.py b/normflows/flows/flow_test.py
index b271351..a597ac6 100644
--- a/normflows/flows/flow_test.py
+++ b/normflows/flows/flow_test.py
@@ -1,6 +1,6 @@
 import unittest
-
 import torch
+
 from torch.testing import assert_close