diff --git a/tests/test_cmap.py b/tests/test_cmap.py
index a2050c78..3760d9d8 100644
--- a/tests/test_cmap.py
+++ b/tests/test_cmap.py
@@ -178,6 +178,7 @@ def test_apply_discrete_cmap():
     assert colormap.apply_cmap(data, cm)
 
     # Test with negative value
+    data = data.astype("int16")
     cm = {-100: (255, 255, 255, 255), 1: (0, 0, 0, 255), 256: (255, 255, 255, 255)}
     data[0, 5:, 5:] = -100
     d, m = colormap.apply_cmap(data, cm)
diff --git a/tests/test_io_xarray.py b/tests/test_io_xarray.py
index e87f38fd..1d128f93 100644
--- a/tests/test_io_xarray.py
+++ b/tests/test_io_xarray.py
@@ -54,10 +54,7 @@ def test_xarray_reader():
         bounds = tms.xy_bounds(tile)
         with pytest.raises(rioxarray.exceptions.OneDimensionalRaster) as error:
             dst.tile(tile.x, tile.y, zoom, auto_expand=False)
-        assert (
-            str(error.value)
-            == "At least one of the clipped raster x,y coordinates has only one point."
-        )
+        assert "At least one of the clipped raster x,y coordinates" in str(error.value)
 
         # Test that a high-zoom tile will succeed with auto_expand=True (and that is the default)
         img = dst.tile(tile.x, tile.y, zoom)