diff --git a/mapclassify/tests/test_rgba.py b/mapclassify/tests/test_rgba.py
index 44729ec..c2e6f13 100644
--- a/mapclassify/tests/test_rgba.py
+++ b/mapclassify/tests/test_rgba.py
@@ -5,29 +5,29 @@
 
 world = geopandas.read_file(
     "https://naciscdn.org/naturalearth/110m/cultural/ne_110m_admin_0_countries.zip"
-).reset_index(drop=True)
+)
+world['area'] = world.area
 
+# columns are equivalent except for nan in the first position
+world['nanarea'] = world.area
+world.loc[0, 'nanarea'] = np.nan
 
 def test_rgba():
-    colors = get_color_array(world.area, cmap="viridis")[0]
-    assert_array_equal(colors, np.array([68, 1, 84, 255])) 
-    
+    colors = get_color_array(world['area'], cmap="viridis")[-1]
+    assert_array_equal(colors, np.array([94, 201,  97, 255])) 
 
 def test_rgba_hex():
-    colors = get_color_array(world.area, cmap="viridis", as_hex=True)[0]
-    assert_array_equal(colors,'#440154') 
+    colors = get_color_array(world['area'], cmap="viridis", as_hex=True)[-1]
+    assert_array_equal(colors,'#5ec961') 
     
 def test_rgba_nan():
-    worldnan = world.copy()
-    worldnan['area'] = worldnan.area
-    worldnan.loc[0, 'area'] = np.nan
-    colors = get_color_array(worldnan['area'], cmap="viridis", nan_color=[0,0,0,0])[0]
-    assert_array_equal(colors, np.array([0, 0, 0, 0])) 
+    colors = get_color_array(world['nanarea'], cmap="viridis", nan_color=[0,0,0,0])
+    # should be nan_color
+    assert_array_equal(colors[0], np.array([0, 0, 0, 0])) 
+    # still a cmap color
+    assert_array_equal(colors[-1], np.array([94, 201,  97, 255])) 
 
 def test_rgba_nan_hex():
-    worldnan = world.copy()
-    worldnan['area'] = worldnan.area
-    worldnan.loc[0, 'area'] = np.nan
-    colors = get_color_array(worldnan['area'], cmap="viridis",nan_color=[0,0,0,0], as_hex=True)[0]
-    assert_array_equal(colors, np.array(['#000000'])) 
-    
\ No newline at end of file
+    colors = get_color_array(world['nanarea'], cmap="viridis",nan_color=[0,0,0,0], as_hex=True)
+    assert_array_equal(colors[0], np.array(['#000000'])) 
+    assert_array_equal(colors[-1], np.array(['#5ec961']))