diff --git a/skimage/util/invert.py b/skimage/util/invert.py
index be0ddef2..f59bef29 100644
--- a/skimage/util/invert.py
+++ b/skimage/util/invert.py
@@ -20,8 +20,8 @@ def invert(image):
     Examples
     --------
     >>> img = np.array([[100, 0, 200],
-    ...			[0,  50, 0],
-    ...			[30,  0, 255]], np.uint8)
+    ...                 [0,  50, 0],
+    ...                 [30,  0, 255]], np.uint8)
     >>> invert(img)
     array([[155, 255,  55],
            [255, 205, 255],
diff --git a/skimage/util/tests/test_invert.py b/skimage/util/tests/test_invert.py
index ea8c7ab9..9de26aa3 100644
--- a/skimage/util/tests/test_invert.py
+++ b/skimage/util/tests/test_invert.py
@@ -1,7 +1,7 @@
 import numpy as np
 from numpy.testing import assert_array_equal
 from skimage import dtype_limits
-from skimage.util import invert
+from skimage.util.invert import invert
 
 
 def test_invert_bool():
@@ -13,6 +13,7 @@ def test_invert_bool():
     result = invert(image)
     assert_array_equal(expected, result)
 
+
 def test_invert_uint8():
     dtype = 'uint8'
     image = np.zeros((3, 3), dtype=dtype)
@@ -22,7 +23,8 @@ def test_invert_uint8():
     result = invert(image)
     assert_array_equal(expected, result)
 
-def test_invert_bool():
+
+def test_invert_int8():
     dtype = 'int8'
     image = np.zeros((3, 3), dtype=dtype)
     image[1, :] = dtype_limits(image)[1]
@@ -31,7 +33,8 @@ def test_invert_bool():
     result = invert(image)
     assert_array_equal(expected, result)
 
-def test_invert_bool():
+
+def test_invert_float64():
     dtype = 'float64'
     image = np.zeros((3, 3), dtype=dtype)
     image[1, :] = dtype_limits(image)[1]