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diff --git a/src/silx/gui/plot/test/testAlphaSlider.py b/src/silx/gui/plot/test/testAlphaSlider.py
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+++ b/src/silx/gui/plot/test/testAlphaSlider.py
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+# coding: utf-8
+# /*##########################################################################
+#
+# Copyright (c) 2017-2019 European Synchrotron Radiation Facility
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+# ###########################################################################*/
+"""Tests for ImageAlphaSlider"""
+
+
+__authors__ = ["P. Knobel"]
+__license__ = "MIT"
+__date__ = "28/03/2017"
+
+import numpy
+import unittest
+
+from silx.gui import qt
+from silx.gui.utils.testutils import TestCaseQt
+from silx.gui.plot import PlotWidget
+from silx.gui.plot import AlphaSlider
+
+
+class TestActiveImageAlphaSlider(TestCaseQt):
+    def setUp(self):
+        super(TestActiveImageAlphaSlider, self).setUp()
+        self.plot = PlotWidget()
+        self.aslider = AlphaSlider.ActiveImageAlphaSlider(plot=self.plot)
+        self.aslider.setOrientation(qt.Qt.Horizontal)
+
+        toolbar = qt.QToolBar("plot", self.plot)
+        toolbar.addWidget(self.aslider)
+        self.plot.addToolBar(toolbar)
+
+        self.plot.show()
+        self.qWaitForWindowExposed(self.plot)
+
+        self.mouseMove(self.plot)  # Move to center
+        self.qapp.processEvents()
+
+    def tearDown(self):
+        self.qapp.processEvents()
+        self.plot.setAttribute(qt.Qt.WA_DeleteOnClose)
+        self.plot.close()
+        del self.plot
+        del self.aslider
+
+        super(TestActiveImageAlphaSlider, self).tearDown()
+
+    def testWidgetEnabled(self):
+        # no active image initially, slider must be deactivate
+        self.assertFalse(self.aslider.isEnabled())
+
+        self.plot.addImage(numpy.array([[0, 1, 2], [3, 4, 5]]))
+        # now we have an active image
+        self.assertTrue(self.aslider.isEnabled())
+
+        self.plot.setActiveImage(None)
+        self.assertFalse(self.aslider.isEnabled())
+
+    def testGetImage(self):
+        self.plot.addImage(numpy.array([[0, 1, 2], [3, 4, 5]]))
+        self.assertEqual(self.plot.getActiveImage(),
+                         self.aslider.getItem())
+
+        self.plot.addImage(numpy.array([[0, 1, 3], [2, 4, 6]]), legend="2")
+        self.plot.setActiveImage("2")
+        self.assertEqual(self.plot.getImage("2"),
+                         self.aslider.getItem())
+
+    def testGetAlpha(self):
+        self.plot.addImage(numpy.array([[0, 1, 2], [3, 4, 5]]), legend="1")
+        self.aslider.setValue(137)
+        self.assertAlmostEqual(self.aslider.getAlpha(),
+                               137. / 255)
+
+
+class TestNamedImageAlphaSlider(TestCaseQt):
+    def setUp(self):
+        super(TestNamedImageAlphaSlider, self).setUp()
+        self.plot = PlotWidget()
+        self.aslider = AlphaSlider.NamedImageAlphaSlider(plot=self.plot)
+        self.aslider.setOrientation(qt.Qt.Horizontal)
+
+        toolbar = qt.QToolBar("plot", self.plot)
+        toolbar.addWidget(self.aslider)
+        self.plot.addToolBar(toolbar)
+
+        self.plot.show()
+        self.qWaitForWindowExposed(self.plot)
+
+        self.mouseMove(self.plot)  # Move to center
+        self.qapp.processEvents()
+
+    def tearDown(self):
+        self.qapp.processEvents()
+        self.plot.setAttribute(qt.Qt.WA_DeleteOnClose)
+        self.plot.close()
+        del self.plot
+        del self.aslider
+
+        super(TestNamedImageAlphaSlider, self).tearDown()
+
+    def testWidgetEnabled(self):
+        # no image set initially, slider must be deactivate
+        self.assertFalse(self.aslider.isEnabled())
+
+        self.plot.addImage(numpy.array([[0, 1, 2], [3, 4, 5]]), legend="1")
+        self.aslider.setLegend("1")
+        # now we have an image set
+        self.assertTrue(self.aslider.isEnabled())
+
+    def testGetImage(self):
+        self.plot.addImage(numpy.array([[0, 1, 2], [3, 4, 5]]), legend="1")
+        self.plot.addImage(numpy.array([[0, 1, 3], [2, 4, 6]]), legend="2")
+        self.aslider.setLegend("1")
+        self.assertEqual(self.plot.getImage("1"),
+                         self.aslider.getItem())
+
+        self.aslider.setLegend("2")
+        self.assertEqual(self.plot.getImage("2"),
+                         self.aslider.getItem())
+
+    def testGetAlpha(self):
+        self.plot.addImage(numpy.array([[0, 1, 2], [3, 4, 5]]), legend="1")
+        self.aslider.setLegend("1")
+        self.aslider.setValue(128)
+        self.assertAlmostEqual(self.aslider.getAlpha(),
+                               128. / 255)
+
+
+class TestNamedScatterAlphaSlider(TestCaseQt):
+    def setUp(self):
+        super(TestNamedScatterAlphaSlider, self).setUp()
+        self.plot = PlotWidget()
+        self.aslider = AlphaSlider.NamedScatterAlphaSlider(plot=self.plot)
+        self.aslider.setOrientation(qt.Qt.Horizontal)
+
+        toolbar = qt.QToolBar("plot", self.plot)
+        toolbar.addWidget(self.aslider)
+        self.plot.addToolBar(toolbar)
+
+        self.plot.show()
+        self.qWaitForWindowExposed(self.plot)
+
+        self.mouseMove(self.plot)  # Move to center
+        self.qapp.processEvents()
+
+    def tearDown(self):
+        self.qapp.processEvents()
+        self.plot.setAttribute(qt.Qt.WA_DeleteOnClose)
+        self.plot.close()
+        del self.plot
+        del self.aslider
+
+        super(TestNamedScatterAlphaSlider, self).tearDown()
+
+    def testWidgetEnabled(self):
+        # no Scatter set initially, slider must be deactivate
+        self.assertFalse(self.aslider.isEnabled())
+
+        self.plot.addScatter([0, 1, 2], [2, 3, 4], [5, 6, 7],
+                             legend="1")
+        self.aslider.setLegend("1")
+        # now we have an image set
+        self.assertTrue(self.aslider.isEnabled())
+
+    def testGetScatter(self):
+        self.plot.addScatter([0, 1, 2], [2, 3, 4], [5, 6, 7],
+                             legend="1")
+        self.plot.addScatter([0, 10, 20], [20, 30, 40], [50, 60, 70],
+                             legend="2")
+        self.aslider.setLegend("1")
+        self.assertEqual(self.plot.getScatter("1"),
+                         self.aslider.getItem())
+
+        self.aslider.setLegend("2")
+        self.assertEqual(self.plot.getScatter("2"),
+                         self.aslider.getItem())
+
+    def testGetAlpha(self):
+        self.plot.addScatter([0, 10, 20], [20, 30, 40], [50, 60, 70],
+                             legend="1")
+        self.aslider.setLegend("1")
+        self.aslider.setValue(128)
+        self.assertAlmostEqual(self.aslider.getAlpha(),
+                               128. / 255)