diff --git a/ocf_datapipes/utils/utils.py b/ocf_datapipes/utils/utils.py
index abbd5275a..b1c5bc25a 100644
--- a/ocf_datapipes/utils/utils.py
+++ b/ocf_datapipes/utils/utils.py
@@ -336,7 +336,7 @@ def combine_to_single_dataset(dataset_dict: dict[str, xr.Dataset]) -> xr.Dataset
     Combine multiple datasets into a single dataset
 
     Args:
-        *datasets: Datasets to combine
+        dataset_dict: Dictionary of xr.Dataset objects to combine
 
     Returns:
         Combined dataset
diff --git a/ocf_datapipes/validation/check_for_nans.py b/ocf_datapipes/validation/check_for_nans.py
index 421ce2a83..dfea01198 100644
--- a/ocf_datapipes/validation/check_for_nans.py
+++ b/ocf_datapipes/validation/check_for_nans.py
@@ -25,6 +25,7 @@ def __init__(
             source_datapipe: Datapipe emitting Xarray Datasets
             dataset_name: Optional name for dataset to check, if None, checks whole dataset
             fill_nans: Whether to fill NaNs with 0 or not
+            fill_value: Value to fill NaNs with
         """
         self.source_datapipe = source_datapipe
         self.dataset_name = dataset_name
diff --git a/tests/training/test_windnet.py b/tests/training/test_windnet.py
new file mode 100644
index 000000000..f9919d90a
--- /dev/null
+++ b/tests/training/test_windnet.py
@@ -0,0 +1,28 @@
+from datetime import datetime
+
+from ocf_datapipes.training.windnet import (
+    windnet_datapipe,
+    windnet_netcdf_datapipe,
+)
+from ocf_datapipes.utils.utils import combine_to_single_dataset, uncombine_from_single_dataset
+import pytest
+
+
+def test_windnet_datapipe(configuration_filename):
+    start_time = datetime(1900, 1, 1)
+    end_time = datetime(2050, 1, 1)
+    dp = windnet_datapipe(
+        configuration_filename,
+        start_time=start_time,
+        end_time=end_time,
+    )
+    datasets = next(iter(dp))
+    dataset = combine_to_single_dataset(datasets)
+    # Need to serialize attributes to strings
+    dataset.to_netcdf("test.nc", mode="w", engine="h5netcdf", compute=True)
+    dp = windnet_netcdf_datapipe(
+        config_filename=configuration_filename,
+        filenames=["test.nc"],
+        keys=["gsp", "nwp", "sat", "pv"],
+    )
+    datasets = next(iter(dp))