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diff --git a/src/silx/gui/plot/test/testPixelIntensityHistoAction.py b/src/silx/gui/plot/test/testPixelIntensityHistoAction.py
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+# coding: utf-8
+# /*##########################################################################
+#
+# Copyright (c) 2016-2018 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.
+#
+# ###########################################################################*/
+"""Basic tests for PixelIntensitiesHistoAction"""
+
+__authors__ = ["T. Vincent"]
+__license__ = "MIT"
+__date__ = "02/03/2018"
+
+
+import numpy
+import unittest
+
+from silx.utils.testutils import ParametricTestCase
+from silx.gui.utils.testutils import TestCaseQt, getQToolButtonFromAction
+from silx.gui import qt
+from silx.gui.plot import Plot2D
+
+
+class TestPixelIntensitiesHisto(TestCaseQt, ParametricTestCase):
+    """Tests for PixelIntensitiesHistoAction widget."""
+
+    def setUp(self):
+        super(TestPixelIntensitiesHisto, self).setUp()
+        self.image = numpy.random.rand(10, 10)
+        self.plotImage = Plot2D()
+        self.plotImage.getIntensityHistogramAction().setVisible(True)
+
+    def tearDown(self):
+        del self.plotImage
+        super(TestPixelIntensitiesHisto, self).tearDown()
+
+    def testShowAndHide(self):
+        """Simple test that the plot is showing and hiding when activating the
+        action"""
+        self.plotImage.addImage(self.image, origin=(0, 0), legend='sino')
+        self.plotImage.show()
+
+        histoAction = self.plotImage.getIntensityHistogramAction()
+
+        # test the pixel intensity diagram is showing
+        button = getQToolButtonFromAction(histoAction)
+        self.assertIsNot(button, None)
+        self.mouseMove(button)
+        self.mouseClick(button, qt.Qt.LeftButton)
+        self.qapp.processEvents()
+        self.assertTrue(histoAction.getHistogramWidget().isVisible())
+
+        # test the pixel intensity diagram is hiding
+        self.qapp.setActiveWindow(self.plotImage)
+        self.qapp.processEvents()
+        self.mouseMove(button)
+        self.mouseClick(button, qt.Qt.LeftButton)
+        self.qapp.processEvents()
+        self.assertFalse(histoAction.getHistogramWidget().isVisible())
+
+    def testImageFormatInput(self):
+        """Test multiple type as image input"""
+        typesToTest = [numpy.uint8, numpy.int8, numpy.int16, numpy.int32,
+                       numpy.float32, numpy.float64]
+        self.plotImage.addImage(self.image, origin=(0, 0), legend='sino')
+        self.plotImage.show()
+        button = getQToolButtonFromAction(
+            self.plotImage.getIntensityHistogramAction())
+        self.mouseMove(button)
+        self.mouseClick(button, qt.Qt.LeftButton)
+        self.qapp.processEvents()
+        for typeToTest in typesToTest:
+            with self.subTest(typeToTest=typeToTest):
+                self.plotImage.addImage(self.image.astype(typeToTest),
+                                        origin=(0, 0), legend='sino')
+
+    def testScatter(self):
+        """Test that an histogram from a scatter is displayed"""
+        xx = numpy.arange(10)
+        yy = numpy.arange(10)
+        value = numpy.sin(xx)
+        self.plotImage.addScatter(xx, yy, value)
+        self.plotImage.show()
+
+        histoAction = self.plotImage.getIntensityHistogramAction()
+
+        # test the pixel intensity diagram is showing
+        button = getQToolButtonFromAction(histoAction)
+        self.assertIsNot(button, None)
+        self.mouseMove(button)
+        self.mouseClick(button, qt.Qt.LeftButton)
+        self.qapp.processEvents()
+
+        widget = histoAction.getHistogramWidget()
+        self.assertTrue(widget.isVisible())
+        items = widget.getPlotWidget().getItems()
+        self.assertEqual(len(items), 1)
+
+    def testChangeItem(self):
+        """Test that histogram changes it the item changes"""
+        xx = numpy.arange(10)
+        yy = numpy.arange(10)
+        value = numpy.sin(xx)
+        self.plotImage.addScatter(xx, yy, value)
+        self.plotImage.show()
+
+        histoAction = self.plotImage.getIntensityHistogramAction()
+
+        # test the pixel intensity diagram is showing
+        button = getQToolButtonFromAction(histoAction)
+        self.assertIsNot(button, None)
+        self.mouseMove(button)
+        self.mouseClick(button, qt.Qt.LeftButton)
+        self.qapp.processEvents()
+
+        # Reach histogram from the first item
+        widget = histoAction.getHistogramWidget()
+        self.assertTrue(widget.isVisible())
+        items = widget.getPlotWidget().getItems()
+        data1 = items[0].getValueData(copy=False)
+
+        # Set another item to the plot
+        self.plotImage.addImage(self.image, origin=(0, 0), legend='sino')
+        self.qapp.processEvents()
+        data2 = items[0].getValueData(copy=False)
+
+        # Histogram is not the same
+        self.assertFalse(numpy.array_equal(data1, data2))