diff --git a/tests/triacontagon/test_loop.py b/tests/triacontagon/test_loop.py
index 7456ab5..dcc975a 100644
--- a/tests/triacontagon/test_loop.py
+++ b/tests/triacontagon/test_loop.py
@@ -83,7 +83,7 @@ def test_train_loop_01():
         [1, 0, 0, 1, 0],
         [0, 0, 1, 0, 1],
         [0, 1, 0, 0, 0]
-    ])
+    ], dtype=torch.float32)
     foo_foo = (foo_foo + foo_foo.transpose(0, 1)) / 2
 
     foo_bar = torch.tensor([
@@ -92,7 +92,7 @@ def test_train_loop_01():
         [0, 1, 0, 0],
         [1, 0, 0, 0],
         [0, 0, 1, 1]
-    ])
+    ], dtype=torch.float32)
     bar_foo = foo_bar.transpose(0, 1)
 
     bar_bar = torch.tensor([
@@ -100,7 +100,7 @@ def test_train_loop_01():
         [1, 0, 0, 0],
         [0, 1, 0, 1],
         [0, 1, 0, 0],
-    ])
+    ], dtype=torch.float32)
     bar_bar = (bar_bar + bar_bar.transpose(0, 1)) / 2
 
     data.add_edge_type('Foo-Foo', 0, 0, [
diff --git a/tests/triacontagon/test_split.py b/tests/triacontagon/test_split.py
index 85ddc9d..dc5459b 100644
--- a/tests/triacontagon/test_split.py
+++ b/tests/triacontagon/test_split.py
@@ -1,7 +1,10 @@
 from triacontagon.split import split_adj_mat, \
-    split_edge_type
+    split_edge_type, \
+    split_data
 from triacontagon.util import _equal
-from triacontagon.data import EdgeType
+from triacontagon.data import EdgeType, \
+    Data
+from triacontagon.decode import dedicom_decoder
 import torch
 
 
@@ -122,3 +125,125 @@ def test_split_edge_type_04():
         res[0].adjacency_matrices[1] + \
         res[1].adjacency_matrices[1] + \
         res[2].adjacency_matrices[1]))
+
+
+def test_split_data_01():
+    data = Data()
+    data.add_vertex_type('Foo', 5)
+    data.add_vertex_type('Bar', 4)
+
+    foo_foo = torch.tensor([
+        [0, 1, 0, 1, 0],
+        [0, 0, 0, 1, 0],
+        [0, 1, 0, 0, 1],
+        [0, 1, 0, 0, 0],
+        [1, 0, 0, 1, 0]
+    ], dtype=torch.float32)
+    foo_foo = (foo_foo + foo_foo.transpose(0, 1)) / 2
+
+    foo_bar = torch.tensor([
+        [0, 1, 0, 1],
+        [0, 0, 0, 1],
+        [0, 1, 0, 0],
+        [1, 0, 0, 0],
+        [0, 0, 1, 1]
+    ], dtype=torch.float32)
+    bar_foo = foo_bar.transpose(0, 1)
+
+    bar_bar = torch.tensor([
+        [0, 0, 1, 0],
+        [1, 0, 0, 0],
+        [0, 1, 0, 1],
+        [0, 1, 0, 0],
+    ], dtype=torch.float32)
+    bar_bar = (bar_bar + bar_bar.transpose(0, 1)) / 2
+
+    data.add_edge_type('Foo-Foo', 0, 0, [
+        foo_foo.to_sparse().coalesce()
+    ], dedicom_decoder)
+    data.add_edge_type('Foo-Bar', 0, 1, [
+        foo_bar.to_sparse().coalesce()
+    ], dedicom_decoder)
+    data.add_edge_type('Bar-Foo', 1, 0, [
+        bar_foo.to_sparse().coalesce()
+    ], dedicom_decoder)
+    data.add_edge_type('Bar-Bar', 1, 1, [
+        bar_bar.to_sparse().coalesce()
+    ], dedicom_decoder)
+
+    (res,) = split_data(data, (1.,))
+
+    assert torch.all(_equal(res.edge_types[0, 0].adjacency_matrices[0],
+        data.edge_types[0, 0].adjacency_matrices[0]))
+
+    assert torch.all(_equal(res.edge_types[0, 1].adjacency_matrices[0],
+        data.edge_types[0, 1].adjacency_matrices[0]))
+
+    assert torch.all(_equal(res.edge_types[1, 0].adjacency_matrices[0],
+        data.edge_types[1, 0].adjacency_matrices[0]))
+
+    assert torch.all(_equal(res.edge_types[1, 1].adjacency_matrices[0],
+        data.edge_types[1, 1].adjacency_matrices[0]))
+
+
+def test_split_data_02():
+    data = Data()
+    data.add_vertex_type('Foo', 5)
+    data.add_vertex_type('Bar', 4)
+
+    foo_foo = torch.tensor([
+        [0, 1, 0, 1, 0],
+        [0, 0, 0, 1, 0],
+        [0, 1, 0, 0, 1],
+        [0, 1, 0, 0, 0],
+        [1, 0, 0, 1, 0]
+    ], dtype=torch.float32)
+    foo_foo = (foo_foo + foo_foo.transpose(0, 1)) / 2
+
+    foo_bar = torch.tensor([
+        [0, 1, 0, 1],
+        [0, 0, 0, 1],
+        [0, 1, 0, 0],
+        [1, 0, 0, 0],
+        [0, 0, 1, 1]
+    ], dtype=torch.float32)
+    bar_foo = foo_bar.transpose(0, 1)
+
+    bar_bar = torch.tensor([
+        [0, 0, 1, 0],
+        [1, 0, 0, 0],
+        [0, 1, 0, 1],
+        [0, 1, 0, 0],
+    ], dtype=torch.float32)
+    bar_bar = (bar_bar + bar_bar.transpose(0, 1)) / 2
+
+    data.add_edge_type('Foo-Foo', 0, 0, [
+        foo_foo.to_sparse().coalesce()
+    ], dedicom_decoder)
+    data.add_edge_type('Foo-Bar', 0, 1, [
+        foo_bar.to_sparse().coalesce()
+    ], dedicom_decoder)
+    data.add_edge_type('Bar-Foo', 1, 0, [
+        bar_foo.to_sparse().coalesce()
+    ], dedicom_decoder)
+    data.add_edge_type('Bar-Bar', 1, 1, [
+        bar_bar.to_sparse().coalesce()
+    ], dedicom_decoder)
+
+    a, b = split_data(data, (.5,.5))
+
+    assert torch.all(_equal(a.edge_types[0, 0].adjacency_matrices[0] + \
+        b.edge_types[0, 0].adjacency_matrices[0],
+            data.edge_types[0, 0].adjacency_matrices[0]))
+
+    assert torch.all(_equal(a.edge_types[0, 1].adjacency_matrices[0] + \
+        b.edge_types[0, 1].adjacency_matrices[0],
+            data.edge_types[0, 1].adjacency_matrices[0]))
+
+    assert torch.all(_equal(a.edge_types[1, 0].adjacency_matrices[0] + \
+        b.edge_types[1, 0].adjacency_matrices[0],
+            data.edge_types[1, 0].adjacency_matrices[0]))
+
+    assert torch.all(_equal(a.edge_types[1, 1].adjacency_matrices[0] + \
+        b.edge_types[1, 1].adjacency_matrices[0],
+            data.edge_types[1, 1].adjacency_matrices[0]))