Make skip condition cleaner

skimage/viewer/tests/test_plugins.py

@@ -15,10 +15,9 @@ try:
         PlotPlugin)
     from skimage.viewer.plugins.base import Plugin
     from skimage.viewer.widgets import Slider
+    viewer_available = not qt_api is None
 except ImportError:
-    skip_all = True
-else:
-    skip_all = False
+    viewer_available = False
 
 
 def setup_line_profile(image, limits='image'):
@@ -28,7 +27,7 @@ def setup_line_profile(image, limits='image'):
     return plugin
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_line_profile():
     """ Test a line profile using an ndim=2 image"""
     plugin = setup_line_profile(data.camera())
@@ -42,7 +41,7 @@ def test_line_profile():
     assert_allclose(scan_data.mean(), 0.2812, rtol=1e-3)
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_line_profile_rgb():
     """ Test a line profile using an ndim=3 image"""
     plugin = setup_line_profile(data.chelsea(), limits=None)
@@ -57,7 +56,7 @@ def test_line_profile_rgb():
     assert_allclose(scan_data.mean(), 0.4359, rtol=1e-3)
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_line_profile_dynamic():
     """Test a line profile updating after an image transform"""
     image = data.coins()[:-50, :]  # shave some off to make the line lower
@@ -82,7 +81,7 @@ def test_line_profile_dynamic():
     assert_almost_equal(np.max(line) - np.min(line), 0.639, 1)
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_measure():
     image = data.camera()
     viewer = ImageViewer(image)
@@ -94,7 +93,7 @@ def test_measure():
     assert_equal(str(m._angle.text[:5]), '135.0')
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_canny():
     image = data.camera()
     viewer = ImageViewer(image)
@@ -107,7 +106,7 @@ def test_canny():
     assert edges.sum() == 2852
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_label_painter():
     image = data.camera()
     moon = data.moon()
@@ -125,7 +124,7 @@ def test_label_painter():
     assert_equal(lp.paint_tool.shape, moon.shape)
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_crop():
     image = data.camera()
     viewer = ImageViewer(image)
@@ -136,7 +135,7 @@ def test_crop():
     assert_equal(viewer.image.shape, (101, 101))
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_color_histogram():
     image = skimage.img_as_float(data.load('color.png'))
     viewer = ImageViewer(image)
@@ -148,7 +147,7 @@ def test_color_histogram():
     assert_almost_equal(viewer.image.std(), 0.325, 3)
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_plot_plugin():
     viewer = ImageViewer(data.moon())
     plugin = PlotPlugin(image_filter=lambda x: x)
@@ -160,7 +159,7 @@ def test_plot_plugin():
     viewer.close()
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_plugin():
     img = skimage.img_as_float(data.moon())
     viewer = ImageViewer(img)

skimage/viewer/tests/test_tools.py

@@ -11,10 +11,9 @@ try:
     from skimage.viewer.canvastools import (
         LineTool, ThickLineTool, RectangleTool, PaintTool)
     from skimage.viewer.canvastools.base import CanvasToolBase
+    viewer_available = not qt_api is None
 except ImportError:
-    skip_all = True
-else:
-    skip_all = False
+    viewer_available = False
 
 
 def get_end_points(image):
@@ -76,7 +75,7 @@ def create_mouse_event(ax, button=1, xdata=0, ydata=0, key=None):
     return event
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_line_tool():
     img = data.camera()
     viewer = ImageViewer(img)
@@ -102,7 +101,7 @@ def test_line_tool():
     assert_equal(tool.geometry, np.array([[100, 100], [10, 10]]))
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_thick_line_tool():
     img = data.camera()
     viewer = ImageViewer(img)
@@ -127,7 +126,7 @@ def test_thick_line_tool():
     assert_equal(tool.linewidth, 1)
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_rect_tool():
     img = data.camera()
     viewer = ImageViewer(img)
@@ -159,7 +158,7 @@ def test_rect_tool():
     assert_equal(tool.geometry, [10, 100,  10, 100])
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_paint_tool():
     img = data.moon()
     viewer = ImageViewer(img)
@@ -195,7 +194,7 @@ def test_paint_tool():
     assert_equal(tool.overlay.sum(), 0)
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_base_tool():
     img = data.moon()
     viewer = ImageViewer(img)

skimage/viewer/tests/test_viewer.py

@@ -10,13 +10,12 @@ try:
     from skimage.viewer.plugins import OverlayPlugin
     from skimage.viewer.plugins.overlayplugin import recent_mpl_version
     from skimage.viewer import ImageViewer, CollectionViewer
+    viewer_available = not qt_api is None
 except ImportError:
-    skip_all = True
-else:
-    skip_all = False
+    viewer_available = False
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_viewer():
     lena = data.lena()
     coins = data.coins()
@@ -43,7 +42,7 @@ def make_key_event(key):
                            QtCore.Qt.NoModifier)
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_collection_viewer():
 
     img = data.lena()
@@ -59,7 +58,7 @@ def test_collection_viewer():
     view._format_coord(10, 10)
 
 
-@skipif(skip_all or qt_api is None or not recent_mpl_version())
+@skipif(not viewer_available or not recent_mpl_version())
 def test_viewer_with_overlay():
     img = data.coins()
     ov = OverlayPlugin(image_filter=sobel)

skimage/viewer/tests/test_widgets.py

@@ -10,10 +10,9 @@ try:
     from skimage.viewer.widgets import (
         Slider, OKCancelButtons, SaveButtons, ComboBox, Text)
     from skimage.viewer.plugins.base import Plugin
+    viewer_available = not qt_api is None
 except ImportError:
-    skip_all = True
-else:
-    skip_all = False
+    viewer_available = False
 
 
 def get_image_viewer():
@@ -23,7 +22,7 @@ def get_image_viewer():
     return viewer
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_combo_box():
     viewer = get_image_viewer()
     cb = ComboBox('hello', ('a', 'b', 'c'))
@@ -36,7 +35,7 @@ def test_combo_box():
     assert_equal(cb.index, 2)
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_text_widget():
     viewer = get_image_viewer()
     txt = Text('hello', 'hello, world!')
@@ -47,7 +46,7 @@ def test_text_widget():
     assert_equal(str(txt.text), 'goodbye, world!')
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_slider_int():
     viewer = get_image_viewer()
     sld = Slider('radius', 2, 10, value_type='int')
@@ -61,7 +60,7 @@ def test_slider_int():
     assert_equal(sld.val, 5)
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_slider_float():
     viewer = get_image_viewer()
     sld = Slider('alpha', 2.1, 3.1, value=2.1, value_type='float',
@@ -76,7 +75,7 @@ def test_slider_float():
     assert_almost_equal(sld.val, 2.5, 2)
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_save_buttons():
     viewer = get_image_viewer()
     sv = SaveButtons()
@@ -99,7 +98,7 @@ def test_save_buttons():
     assert_almost_equal(img, viewer.image)
 
 
-@skipif(skip_all or qt_api is None)
+@skipif(not viewer_available)
 def test_ok_buttons():
     viewer = get_image_viewer()
     ok = OKCancelButtons()