diff --git a/tests/onnx2pytorch/operations/test_reducemax.py b/tests/onnx2pytorch/operations/test_reducemax.py
new file mode 100644
index 0000000..03a3649
--- /dev/null
+++ b/tests/onnx2pytorch/operations/test_reducemax.py
@@ -0,0 +1,27 @@
+import pytest
+import torch
+
+from onnx2pytorch.operations import ReduceMax
+
+
+@pytest.fixture
+def tensor():
+    return torch.tensor([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
+
+
+def test_reduce_max_with_dim(tensor):
+    reduce_max = ReduceMax(dim=0, keepdim=True)
+    output = reduce_max(tensor)
+    expected_output = torch.tensor([[7, 8, 9]])
+
+    assert output.ndim == tensor.ndim
+    assert torch.equal(output, expected_output)
+
+
+def test_reduce_max(tensor):
+    reduce_max = ReduceMax(keepdim=False)
+    output = reduce_max(tensor)
+    expected_output = torch.tensor(9)
+
+    assert output.ndim == 0
+    assert torch.equal(output, expected_output)