diff --git a/tests/test_compare_vcfs.py b/tests/test_compare_vcfs.py
index 63741f9..5edd6cf 100644
--- a/tests/test_compare_vcfs.py
+++ b/tests/test_compare_vcfs.py
@@ -71,10 +71,10 @@ def test_both_biallelic_same_alleles_same_order():
     ds1 = make_test_case()
     ds2 = ds1.copy(deep=True)
     actual = compare_vcfs.remap_genotypes(ds1, ds2)
-    expected = [
+    expected = np.array([
         [[0, 1], [1, 0]],
         [[1, 0], [0, 1]],
-    ]
+    ])
     assert np.array_equal(actual, expected)
 
 
@@ -85,10 +85,10 @@ def test_both_biallelic_same_alleles_different_order():
         ds2.variant_allele[i] = xr.DataArray(np.flip(ds2.variant_allele[i]))
         ds2.call_genotype[i] = xr.DataArray(np.where(ds2.call_genotype[i] == 0, 1, 0))
     actual = compare_vcfs.remap_genotypes(ds1, ds2)
-    expected = [
+    expected = np.array([
         [[0, 1], [1, 0]],
         [[1, 0], [0, 1]],
-    ]
+    ])
     assert np.array_equal(actual, expected)
 
 
@@ -102,17 +102,17 @@ def test_biallelic_monoallelic():
         ds2.call_genotype[i] = xr.DataArray(np.zeros_like(ds2.call_genotype[i]))
     # Subtest 1
     actual = compare_vcfs.remap_genotypes(ds1, ds2)
-    expected = [
+    expected = np.array([
         [[1, 1], [1, 1]],
         [[2, 2], [2, 2]],
-    ]
+    ])
     assert np.array_equal(actual, expected)
     # Subtest 2
     actual = compare_vcfs.remap_genotypes(ds2, ds1)
-    expected = [
+    expected = np.array([
         [[1, 0], [0, 1]],
         [[2, 1], [1, 2]],
-    ]
+    ])
     assert np.array_equal(actual, expected)
 
 
@@ -127,17 +127,17 @@ def test_both_biallelic_different_alleles():
     ds2.call_genotype[1] = xr.DataArray(data=[[0, 1], [1, 0]])
     # Subtest 1
     actual = compare_vcfs.remap_genotypes(ds1, ds2)
-    expected = [
+    expected = np.array([
         [[1, 2], [2, 1]],
         [[2, 3], [3, 2]],
-    ]
+    ])
     assert np.array_equal(actual, expected)
     # Subtest 2
     actual = compare_vcfs.remap_genotypes(ds2, ds1)
-    expected = [
+    expected = np.array([
         [[2, 0], [0, 2]],
         [[3, 2], [2, 3]],
-    ]
+    ])
     assert np.array_equal(actual, expected)
 
 
@@ -156,10 +156,10 @@ def test_both_monoallelic():
     ds2.variant_allele[1] = xr.DataArray([b'G', b''])
     ds2.call_genotype[1] = xr.DataArray(data=np.zeros_like(ds2.call_genotype[1]))
     actual = compare_vcfs.remap_genotypes(ds1, ds2)
-    expected = [
+    expected = np.array([
         [[0, 0], [0, 0]],
         [[1, 1], [1, 1]],
-    ]
+    ])
     assert np.array_equal(actual, expected)