diff --git a/tests/test_compare_vcfs.py b/tests/test_compare_vcfs.py
index dd428f3..db5084d 100644
--- a/tests/test_compare_vcfs.py
+++ b/tests/test_compare_vcfs.py
@@ -185,6 +185,25 @@ def test_both_monoallelic():
     assert np.array_equal(actual, expected)
 
 
+def test_actg_alleles_true():
+    ds1 = make_test_case()
+    ds2 = ds1.copy(deep=True)
+    actual_alleles, actual_genotypes = compare_vcfs.remap_genotypes(ds1, ds2, actg_alleles=True)
+    expected_alleles = np.array([
+        [b'A', b'C', b'G', b'T'],
+        [b'A', b'C', b'G', b'T'],
+    ])
+    expected_genotypes = xr.DataArray(
+        [
+            [[0, 1], [1, 0]],
+            [[3, 2], [2, 3]],
+        ],
+        dims=["variants", "samples", "ploidy"]
+    )
+    assert np.array_equal(actual_alleles, expected_alleles)
+    assert np.array_equal(actual_genotypes, expected_genotypes)
+
+
 @pytest.mark.parametrize(
     "arr1, arr2, expected",
     [