diff --git a/skimage/util/tests/test_shape.py b/skimage/util/tests/test_shape.py
index b6975d0f..4aea849d 100644
--- a/skimage/util/tests/test_shape.py
+++ b/skimage/util/tests/test_shape.py
@@ -6,41 +6,35 @@ from skimage.util.shape import view_as_blocks, view_as_windows
 
 @raises(TypeError)
 def test_view_as_blocks_block_not_a_tuple():
-
     A = np.arange(10)
     view_as_blocks(A, [5])
 
 
 @raises(ValueError)
 def test_view_as_blocks_negative_shape():
-
     A = np.arange(10)
     view_as_blocks(A, (-2,))
 
 
 @raises(ValueError)
 def test_view_as_blocks_block_too_large():
-
     A = np.arange(10)
     view_as_blocks(A, (11,))
 
 
 @raises(ValueError)
 def test_view_as_blocks_wrong_block_dimension():
-
     A = np.arange(10)
     view_as_blocks(A, (2, 2))
 
 
 @raises(ValueError)
 def test_view_as_blocks_1D_array_wrong_block_shape():
-
     A = np.arange(10)
     view_as_blocks(A, (3,))
 
 
 def test_view_as_blocks_1D_array():
-
     A = np.arange(10)
     B = view_as_blocks(A, (5,))
     assert_equal(B, np.array([[0, 1, 2, 3, 4],
@@ -48,7 +42,6 @@ def test_view_as_blocks_1D_array():
 
 
 def test_view_as_blocks_2D_array():
-
     A = np.arange(4 * 4).reshape(4, 4)
     B = view_as_blocks(A, (2, 2))
     assert_equal(B[0, 1], np.array([[2, 3],
@@ -57,7 +50,6 @@ def test_view_as_blocks_2D_array():
 
 
 def test_view_as_blocks_3D_array():
-
     A = np.arange(4 * 4 * 6).reshape(4, 4, 6)
     B = view_as_blocks(A, (1, 2, 2))
     assert_equal(B.shape, (4, 2, 3, 1, 2, 2))
@@ -69,41 +61,35 @@ def test_view_as_blocks_3D_array():
 
 @raises(TypeError)
 def test_view_as_windows_input_not_array():
-
     A = [1, 2, 3, 4, 5]
     view_as_windows(A, (2,))
 
 
 @raises(TypeError)
 def test_view_as_windows_window_not_tuple():
-
     A = np.arange(10)
     view_as_windows(A, [2])
 
 
 @raises(ValueError)
 def test_view_as_windows_wrong_window_dimension():
-
     A = np.arange(10)
     view_as_windows(A, (2, 2))
 
 
 @raises(ValueError)
 def test_view_as_windows_negative_window_length():
-
     A = np.arange(10)
     view_as_windows(A, (-1,))
 
 
 @raises(ValueError)
 def test_view_as_windows_window_too_large():
-
     A = np.arange(10)
     view_as_windows(A, (11,))
 
 
 def test_view_as_windows_1D():
-
     A = np.arange(10)
     window_shape = (3,)
     B = view_as_windows(A, window_shape)
@@ -118,7 +104,6 @@ def test_view_as_windows_1D():
 
 
 def test_view_as_windows_2D():
-
     A = np.arange(5 * 4).reshape(5, 4)
     window_shape = (4, 3)
     B = view_as_windows(A, window_shape)