Add test for discriminator

scratch/etienne/intersimple/gail/test_discriminator.py

@@ -0,0 +1,14 @@
+from intersim.envs.intersimple import NRasterized
+from discriminator import CnnDiscriminator
+import torch
+
+def test_image_concatenation():
+    env = NRasterized()
+    disc = CnnDiscriminator(env)
+    s = torch.tensor(env.reset()).unsqueeze(0)
+    a = torch.tensor([[0.5]])
+    sa = disc._concatenate(s, a)
+
+    assert sa.shape == (1, 6, 200, 200)
+    assert torch.allclose(sa[:, :5], 1.0 * s)
+    assert (sa[:, 5] == a).all()