diff --git a/src/triacontagon/loop.py b/src/triacontagon/loop.py
index cc20b5a..f52af87 100644
--- a/src/triacontagon/loop.py
+++ b/src/triacontagon/loop.py
@@ -1,7 +1,11 @@
-from .model import Model
+from .model import Model, \
+    TrainingBatch
 from .batch import Batcher
 from .sampling import negative_sample_data
 from .data import Data
+import torch
+from typing import List, \
+    Callable
 
 
 def _merge_pos_neg_batches(pos_batch, neg_batch):
diff --git a/tests/triacontagon/test_loop.py b/tests/triacontagon/test_loop.py
new file mode 100644
index 0000000..dde1299
--- /dev/null
+++ b/tests/triacontagon/test_loop.py
@@ -0,0 +1,66 @@
+from triacontagon.loop import _merge_pos_neg_batches
+from triacontagon.model import TrainingBatch
+import torch
+import pytest
+
+
+def test_merge_pos_neg_batches_01():
+    b_1 = TrainingBatch(0, 0, 0, torch.tensor([
+        [0, 1],
+        [2, 3],
+        [4, 5],
+        [5, 6]
+    ]), torch.ones(4))
+    b_2 = TrainingBatch(0, 0, 0, torch.tensor([
+        [1, 6],
+        [3, 5],
+        [5, 2],
+        [4, 1]
+    ]), torch.zeros(4))
+    b = _merge_pos_neg_batches(b_1, b_2)
+
+    assert b.vertex_type_row == 0
+    assert b.vertex_type_column == 0
+    assert b.relation_type_index == 0
+    assert torch.all(b.edges == torch.tensor([
+        [0, 1],
+        [2, 3],
+        [4, 5],
+        [5, 6],
+        [1, 6],
+        [3, 5],
+        [5, 2],
+        [4, 1]
+    ]))
+    assert torch.all(b.target_values == \
+        torch.cat([ torch.ones(4), torch.zeros(4) ]))
+
+
+def test_merge_pos_neg_batches_02():
+    b_1 = TrainingBatch(0, 1, 0, torch.tensor([
+        [0, 1],
+        [2, 3],
+        [4, 5],
+        [5, 6]
+    ]), torch.ones(4))
+    b_2 = TrainingBatch(0, 0, 0, torch.tensor([
+        [1, 6],
+        [3, 5],
+        [5, 2],
+        [4, 1]
+    ]), torch.zeros(4))
+    print(b_1)
+    with pytest.raises(AssertionError):
+        _ = _merge_pos_neg_batches(b_1, b_2)
+
+    b_1.vertex_type_row, b_1.vertex_type_column = \
+        b_1.vertex_type_column, b_1.vertex_type_row
+    print(b_1)
+    with pytest.raises(AssertionError):
+        _ = _merge_pos_neg_batches(b_1, b_2)
+
+    b_1.vertex_type_row, b_1.relation_type_index = \
+        b_1.relation_type_index, b_1.vertex_type_row
+    print(b_1)
+    with pytest.raises(AssertionError):
+        _ = _merge_pos_neg_batches(b_1, b_2)