diff --git a/tests/test_masking.py b/tests/test_masking.py
new file mode 100644
index 00000000..c5ed0b51
--- /dev/null
+++ b/tests/test_masking.py
@@ -0,0 +1,54 @@
+import torch
+import torch.nn.functional as F
+from torch import nn
+
+from i6_models.parts.frontend.common import mask_pool, get_same_padding, apply_same_padding
+
+def test_masking():
+    # tensor as batch with different sequence lengths
+    T = 2
+    kernel_size = 3
+    stride = 2
+    padding = get_same_padding(kernel_size)
+
+    out_sequence_mask = mask_pool(
+        sequence_mask,
+        kernel_size=kernel_size,
+        stride=stride,
+        padding=padding
+    )
+
+    # what does conv to one sequence in [B, F, T] format
+    B, F = (1, 1)
+    x = torch.ones((B, F, T))
+    pad = lambda x: x
+    conv = nn.Conv1d(
+        in_channels=F,
+        out_channels=F,
+        kernel_size=kernel_size,
+        stride=stride,
+        padding=padding,
+    )
+    out = conv(x)
+    out_len = out.shape[-1]
+
+    # mask for this sequence length in a batch of max length = 100
+    batch_T = 100
+    idx = T - 1 # sequence at this index has length T by following construction
+    in_mask = torch.tensor(
+        [[True] * t + [False] * (batch_T - t) for t in range(1, batch_T + 1)]
+    )
+
+    out_mask = mask_pool(
+        in_mask,
+        kernel_size=kernel_size,
+        stride=stride,
+        padding=padding
+    )[idx, :]
+
+    # we expect True for the length of the sequence and False otherwise
+    mask_len = len(torch.where(out_mask)[0])
+    assert out_len == mask_len, f"Actual out length of the sequence {out_len=}" \
+        + f" and the length of the mask {mask_len=} are not equal where " \
+        + f" {out=} and {out_mask=}."
+