diff --git a/tests/icosagon/test_fastconv.py b/tests/icosagon/test_fastconv.py
index 742173d..2003316 100644
--- a/tests/icosagon/test_fastconv.py
+++ b/tests/icosagon/test_fastconv.py
@@ -18,7 +18,7 @@ def _make_symmetric(x: torch.Tensor):
 
 def _symmetric_random(n_rows, n_columns):
     return _make_symmetric(torch.rand((n_rows, n_columns),
-        dtype=torch.float32).round())
+        dtype=torch.float32).round().to_sparse())
 
 
 def _some_data_with_interactions():
@@ -28,7 +28,7 @@ def _some_data_with_interactions():
 
     fam = d.add_relation_family('Drug-Gene', 1, 0, True)
     fam.add_relation_type('Target',
-        torch.rand((100, 1000), dtype=torch.float32).round())
+        torch.rand((100, 1000), dtype=torch.float32).round().to_sparse())
 
     fam = d.add_relation_family('Gene-Gene', 0, 0, True)
     fam.add_relation_type('Interaction',
@@ -164,10 +164,47 @@ def test_fast_conv_layer_01():
     d = _some_data_with_interactions()
     in_layer = OneHotInputLayer(d)
 
+    d_layer = DecagonLayer(in_layer.output_dim, [32, 32], d)
+    seq_1 = torch.nn.Sequential(in_layer, d_layer)
+    _ = seq_1(None)
+
+    conv_layer = FastConvLayer(in_layer.output_dim, [32, 32], d)
+    seq_2 = torch.nn.Sequential(in_layer, conv_layer)
+    _ = seq_2(None)
+
+
+def test_fast_conv_layer_02():
+    d = _some_data_with_interactions()
+    in_layer = OneHotInputLayer(d)
+
     d_layer = DecagonLayer(in_layer.output_dim, [32, 32], d)
     seq_1 = torch.nn.Sequential(in_layer, d_layer)
     out_repr_1 = seq_1(None)
 
+    assert len(d_layer.next_layer_repr[0]) == 2
+    assert len(d_layer.next_layer_repr[1]) == 2
+
     conv_layer = FastConvLayer(in_layer.output_dim, [32, 32], d)
+    assert len(conv_layer.next_layer_repr[1]) == 2
+    conv_layer.next_layer_repr[1][0].weights = torch.cat([
+        d_layer.next_layer_repr[1][0].convolutions[0].graph_conv.weight,
+    ], dim=1)
+    conv_layer.next_layer_repr[1][1].weights = torch.cat([
+        d_layer.next_layer_repr[1][1].convolutions[0].graph_conv.weight,
+        d_layer.next_layer_repr[1][1].convolutions[1].graph_conv.weight,
+        d_layer.next_layer_repr[1][1].convolutions[2].graph_conv.weight,
+    ], dim=1)
+    assert len(conv_layer.next_layer_repr[0]) == 2
+    conv_layer.next_layer_repr[0][0].weights = torch.cat([
+        d_layer.next_layer_repr[0][0].convolutions[0].graph_conv.weight,
+    ], dim=1)
+    conv_layer.next_layer_repr[0][1].weights = torch.cat([
+        d_layer.next_layer_repr[0][1].convolutions[0].graph_conv.weight,
+    ], dim=1)
+
     seq_2 = torch.nn.Sequential(in_layer, conv_layer)
     out_repr_2 = seq_2(None)
+
+    assert len(out_repr_1) == len(out_repr_2)
+    for i in range(len(out_repr_1)):
+        assert torch.all(out_repr_1[i] == out_repr_2[i])