diff --git a/src/zampy/datasets/converter.py b/src/zampy/datasets/converter.py
index 5fdf4b1..c57a6d0 100644
--- a/src/zampy/datasets/converter.py
+++ b/src/zampy/datasets/converter.py
@@ -36,7 +36,16 @@ def check_convention(convention: Union[str, Path]) -> None:
 def convert(
     data: xr.Dataset, dataset: Dataset, convention: Union[str, Path]
 ) -> xr.Dataset:
-    """Convert a loaded dataset to the specified convention."""
+    """Convert a loaded dataset to the specified convention.
+
+    Args:
+        data: Input xarray data.
+        dataset: Zampy dataset instance.
+        convention: Input data exchange convention.
+
+    Return:
+        Input xarray with converted variables following given convention.
+    """
     converted = False
     if isinstance(convention, str):
         convention_file = Path(CONVENTIONS[convention]).open(mode="r", encoding="UTF8")
diff --git a/tests/test_converter.py b/tests/test_converter.py
new file mode 100644
index 0000000..64b662a
--- /dev/null
+++ b/tests/test_converter.py
@@ -0,0 +1,49 @@
+"""Unit test for regridding."""
+
+from pathlib import Path
+import numpy as np
+import pytest
+from zampy.datasets import EthCanopyHeight
+from zampy.datasets import converter
+from zampy.datasets.eth_canopy_height import parse_tiff_file
+
+
+path_dummy_data = Path(__file__).resolve().parent / "test_data" / "eth-canopy-height"
+
+# ruff: noqa: B018 (protected-access)
+
+
+def test_check_convention_not_support():
+    convention = "fake_convention"
+    with pytest.raises(ValueError, match="not supported"):
+        converter.check_convention(convention)
+
+
+def test_check_convention_not_exist():
+    convention = Path("fake_path")
+    with pytest.raises(FileNotFoundError, match="could not be found"):
+        converter.check_convention(convention)
+
+
+def test_convert():
+    ds = parse_tiff_file(
+        path_dummy_data / "ETH_GlobalCanopyHeight_10m_2020_N51E003_Map.tif",
+    )
+    ds_convert = converter.convert(
+        data=ds, dataset=EthCanopyHeight(), convention="ALMA"
+    )
+
+    assert list(ds_convert.data_vars)[0] == "Hveg"
+
+
+def test_convert_var():
+    ds = parse_tiff_file(
+        path_dummy_data / "ETH_GlobalCanopyHeight_10m_2020_N51E003_Map.tif",
+    )
+    ds_convert = converter._convert_var(ds, "height_of_vegetation", "decimeter")
+
+    assert np.allclose(
+        ds_convert["height_of_vegetation"].values,
+        ds["height_of_vegetation"].values * 10.0,
+        equal_nan=True,
+    )
diff --git a/tests/test_datasets/test_eth_canopy_height.py b/tests/test_datasets/test_eth_canopy_height.py
index 7ecf464..29b6bb7 100644
--- a/tests/test_datasets/test_eth_canopy_height.py
+++ b/tests/test_datasets/test_eth_canopy_height.py
@@ -63,14 +63,17 @@ def ingest_dummy_data(self, temp_dir):
         return ds, canopy_height_dataset
 
     def test_ingest(self):
+        """Test ingest function."""
         with TemporaryDirectory() as temp_dir:
             ds, _ = self.ingest_dummy_data(temp_dir)
 
             assert type(ds) == xr.Dataset
 
     def test_load(self):
+        """Test load function."""
         with TemporaryDirectory() as temp_dir:
-            _, canopy_height_dataset = self.ingest_dummy_data(temp_dir)
+            ds, canopy_height_dataset = self.ingest_dummy_data(temp_dir)
+            ds.close()  # make windows happy, otherwise gives PermissionError on CI/CD
 
             times = TimeBounds(np.datetime64("2020-01-01"), np.datetime64("2020-12-31"))
             bbox = SpatialBounds(54, 6, 51, 3)
@@ -87,11 +90,20 @@ def test_load(self):
 
             # we assert the regridded coordinates
             expected_lat = [51.0, 52.0, 53.0, 54.0]
+            expected_lon = [3.0, 4.0, 5.0, 6.0]
 
             np.testing.assert_allclose(ds.latitude.values, expected_lat)
+            np.testing.assert_allclose(ds.longitude.values, expected_lon)
 
     def test_convert(self):
-        pass
+        """Test convert function."""
+        with TemporaryDirectory() as temp_dir:
+            _, canopy_height_dataset = self.ingest_dummy_data(temp_dir)
+            canopy_height_dataset.convert(
+                ingest_dir=Path(temp_dir),
+                convention="ALMA"
+            )
+            # TODO: finish this test when the function is complete.
 
 
 def test_get_filenames():