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diff --git a/src/silx/gui/dialog/test/test_colormapdialog.py b/src/silx/gui/dialog/test/test_colormapdialog.py
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+# coding: utf-8
+# /*##########################################################################
+#
+# Copyright (c) 2016-2021 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 ColormapDialog"""
+
+__authors__ = ["T. Vincent"]
+__license__ = "MIT"
+__date__ = "09/11/2018"
+
+
+import pytest
+import weakref
+
+from silx.gui import qt
+from silx.gui.dialog import ColormapDialog
+from silx.gui.utils.testutils import TestCaseQt
+from silx.gui.colors import Colormap, preferredColormaps
+from silx.utils.testutils import ParametricTestCase
+from silx.gui.plot.items.image import ImageData
+
+import numpy
+
+
+@pytest.fixture
+def colormap():
+    colormap = Colormap(name='gray',
+                        vmin=10.0, vmax=20.0,
+                        normalization='linear')
+    yield colormap
+
+
+@pytest.fixture
+def colormapDialog(qapp, qapp_utils):
+    dialog = ColormapDialog.ColormapDialog()
+    dialog.setAttribute(qt.Qt.WA_DeleteOnClose)
+    yield weakref.proxy(dialog)
+    qapp.processEvents()
+    from silx.gui.qt import inspect
+    if inspect.isValid(dialog):
+        dialog.close()
+        qapp.processEvents()
+
+
+@pytest.fixture
+def colormap_class_attr(request, qapp_utils, colormap, colormapDialog):
+    """Provides few fixtures to a class as class attribute
+
+    Used as transition from TestCase to pytest
+    """
+    request.cls.qapp_utils = qapp_utils
+    request.cls.colormap = colormap
+    request.cls.colormapDiag = colormapDialog
+    yield
+    request.cls.qapp_utils = None
+    request.cls.colormap = None
+    request.cls.colormapDiag = None
+
+
+@pytest.mark.usefixtures("colormap_class_attr")
+class TestColormapDialog(TestCaseQt, ParametricTestCase):
+
+    def testGUIEdition(self):
+        """Make sure the colormap is correctly edited and also that the
+        modification are correctly updated if an other colormapdialog is
+        editing the same colormap"""
+        colormapDiag2 = ColormapDialog.ColormapDialog()
+        colormapDiag2.setColormap(self.colormap)
+        colormapDiag2.show()
+        self.colormapDiag.setColormap(self.colormap)
+        self.colormapDiag.show()
+        self.qapp.processEvents()
+
+        self.colormapDiag._comboBoxColormap._setCurrentName('red')
+        self.colormapDiag._comboBoxNormalization.setCurrentIndex(
+            self.colormapDiag._comboBoxNormalization.findData(Colormap.LOGARITHM))
+        self.assertTrue(self.colormap.getName() == 'red')
+        self.assertTrue(self.colormapDiag.getColormap().getName() == 'red')
+        self.assertTrue(self.colormap.getNormalization() == 'log')
+        self.assertTrue(self.colormap.getVMin() == 10)
+        self.assertTrue(self.colormap.getVMax() == 20)
+        # checked second colormap dialog
+        self.assertTrue(colormapDiag2._comboBoxColormap.getCurrentName() == 'red')
+        self.assertEqual(colormapDiag2._comboBoxNormalization.currentData(),
+                         Colormap.LOGARITHM)
+        self.assertTrue(int(colormapDiag2._minValue.getValue()) == 10)
+        self.assertTrue(int(colormapDiag2._maxValue.getValue()) == 20)
+        colormapDiag2.close()
+
+    def testGUIModalOk(self):
+        """Make sure the colormap is modified if gone through accept"""
+        assert self.colormap.isAutoscale() is False
+        self.colormapDiag.setModal(True)
+        self.colormapDiag.show()
+        self.qapp.processEvents()
+        self.colormapDiag.setColormap(self.colormap)
+        self.assertTrue(self.colormap.getVMin() is not None)
+        self.colormapDiag._minValue.sigAutoScaleChanged.emit(True)
+        self.assertTrue(self.colormap.getVMin() is None)
+        self.colormapDiag._maxValue.sigAutoScaleChanged.emit(True)
+        self.mouseClick(
+            widget=self.colormapDiag._buttonsModal.button(qt.QDialogButtonBox.Ok),
+            button=qt.Qt.LeftButton
+        )
+        self.assertTrue(self.colormap.getVMin() is None)
+        self.assertTrue(self.colormap.getVMax() is None)
+        self.assertTrue(self.colormap.isAutoscale() is True)
+
+    def testGUIModalCancel(self):
+        """Make sure the colormap is not modified if gone through reject"""
+        assert self.colormap.isAutoscale() is False
+        self.colormapDiag.setModal(True)
+        self.colormapDiag.show()
+        self.qapp.processEvents()
+        self.colormapDiag.setColormap(self.colormap)
+        self.assertTrue(self.colormap.getVMin() is not None)
+        self.colormapDiag._minValue.sigAutoScaleChanged.emit(True)
+        self.assertTrue(self.colormap.getVMin() is None)
+        self.mouseClick(
+            widget=self.colormapDiag._buttonsModal.button(qt.QDialogButtonBox.Cancel),
+            button=qt.Qt.LeftButton
+        )
+        self.assertTrue(self.colormap.getVMin() is not None)
+
+    def testGUIModalClose(self):
+        assert self.colormap.isAutoscale() is False
+        self.colormapDiag.setModal(False)
+        self.colormapDiag.show()
+        self.qapp.processEvents()
+        self.colormapDiag.setColormap(self.colormap)
+        self.assertTrue(self.colormap.getVMin() is not None)
+        self.colormapDiag._minValue.sigAutoScaleChanged.emit(True)
+        self.assertTrue(self.colormap.getVMin() is None)
+        self.mouseClick(
+            widget=self.colormapDiag._buttonsNonModal.button(qt.QDialogButtonBox.Close),
+            button=qt.Qt.LeftButton
+        )
+        self.assertTrue(self.colormap.getVMin() is None)
+
+    def testGUIModalReset(self):
+        assert self.colormap.isAutoscale() is False
+        self.colormapDiag.setModal(False)
+        self.colormapDiag.show()
+        self.qapp.processEvents()
+        self.colormapDiag.setColormap(self.colormap)
+        self.assertTrue(self.colormap.getVMin() is not None)
+        self.colormapDiag._minValue.sigAutoScaleChanged.emit(True)
+        self.assertTrue(self.colormap.getVMin() is None)
+        self.mouseClick(
+            widget=self.colormapDiag._buttonsNonModal.button(qt.QDialogButtonBox.Reset),
+            button=qt.Qt.LeftButton
+        )
+        self.assertTrue(self.colormap.getVMin() is not None)
+        self.colormapDiag.close()
+
+    def testGUIClose(self):
+        """Make sure the colormap is modify if go through reject"""
+        assert self.colormap.isAutoscale() is False
+        self.colormapDiag.show()
+        self.qapp.processEvents()
+        self.colormapDiag.setColormap(self.colormap)
+        self.assertTrue(self.colormap.getVMin() is not None)
+        self.colormapDiag._minValue.sigAutoScaleChanged.emit(True)
+        self.assertTrue(self.colormap.getVMin() is None)
+        self.colormapDiag.close()
+        self.qapp.processEvents()
+        self.assertTrue(self.colormap.getVMin() is None)
+
+    def testSetColormapIsCorrect(self):
+        """Make sure the interface fir the colormap when set a new colormap"""
+        self.colormap.setName('red')
+        self.colormapDiag.show()
+        self.qapp.processEvents()
+        for norm in (Colormap.NORMALIZATIONS):
+            for autoscale in (True, False):
+                if autoscale is True:
+                    self.colormap.setVRange(None, None)
+                else:
+                    self.colormap.setVRange(11, 101)
+                self.colormap.setNormalization(norm)
+                with self.subTest(colormap=self.colormap):
+                    self.colormapDiag.setColormap(self.colormap)
+                    self.assertEqual(
+                        self.colormapDiag._comboBoxNormalization.currentData(), norm)
+                    self.assertTrue(
+                        self.colormapDiag._comboBoxColormap.getCurrentName() == 'red')
+                    self.assertTrue(
+                        self.colormapDiag._minValue.isAutoChecked() == autoscale)
+                    self.assertTrue(
+                        self.colormapDiag._maxValue.isAutoChecked() == autoscale)
+                    if autoscale is False:
+                        self.assertTrue(self.colormapDiag._minValue.getValue() == 11)
+                        self.assertTrue(self.colormapDiag._maxValue.getValue() == 101)
+                        self.assertTrue(self.colormapDiag._minValue.isEnabled())
+                        self.assertTrue(self.colormapDiag._maxValue.isEnabled())
+                    else:
+                        self.assertFalse(self.colormapDiag._minValue._numVal.isEnabled())
+                        self.assertFalse(self.colormapDiag._maxValue._numVal.isEnabled())
+
+    def testColormapDel(self):
+        """Check behavior if the colormap has been deleted outside. For now
+        we make sure the colormap is still running and nothing more"""
+        colormap = Colormap(name='gray')
+        self.colormapDiag.setColormap(colormap)
+        self.colormapDiag.show()
+        self.qapp.processEvents()
+        colormap = None
+        self.assertTrue(self.colormapDiag.getColormap() is None)
+        self.colormapDiag._comboBoxColormap._setCurrentName('blue')
+
+    def testColormapEditedOutside(self):
+        """Make sure the GUI is still up to date if the colormap is modified
+        outside"""
+        self.colormapDiag.setColormap(self.colormap)
+        self.colormapDiag.show()
+        self.qapp.processEvents()
+
+        self.colormap.setName('red')
+        self.assertTrue(
+            self.colormapDiag._comboBoxColormap.getCurrentName() == 'red')
+        self.colormap.setNormalization(Colormap.LOGARITHM)
+        self.assertEqual(self.colormapDiag._comboBoxNormalization.currentData(),
+                         Colormap.LOGARITHM)
+        self.colormap.setVRange(11, 201)
+        self.assertTrue(self.colormapDiag._minValue.getValue() == 11)
+        self.assertTrue(self.colormapDiag._maxValue.getValue() == 201)
+        self.assertTrue(self.colormapDiag._minValue._numVal.isEnabled())
+        self.assertTrue(self.colormapDiag._maxValue._numVal.isEnabled())
+        self.assertFalse(self.colormapDiag._minValue.isAutoChecked())
+        self.assertFalse(self.colormapDiag._maxValue.isAutoChecked())
+        self.colormap.setVRange(None, None)
+        self.assertFalse(self.colormapDiag._minValue._numVal.isEnabled())
+        self.assertFalse(self.colormapDiag._maxValue._numVal.isEnabled())
+        self.assertTrue(self.colormapDiag._minValue.isAutoChecked())
+        self.assertTrue(self.colormapDiag._maxValue.isAutoChecked())
+
+    def testSetColormapScenario(self):
+        """Test of a simple scenario of a colormap dialog editing several
+        colormap"""
+        colormap1 = Colormap(name='gray', vmin=10.0, vmax=20.0,
+                             normalization='linear')
+        colormap2 = Colormap(name='red', vmin=10.0, vmax=20.0,
+                             normalization='log')
+        colormap3 = Colormap(name='blue', vmin=None, vmax=None,
+                             normalization='linear')
+        self.colormapDiag.setColormap(self.colormap)
+        self.colormapDiag.setColormap(colormap1)
+        del colormap1
+        self.colormapDiag.setColormap(colormap2)
+        del colormap2
+        self.colormapDiag.setColormap(colormap3)
+        del colormap3
+
+    def testNotPreferredColormap(self):
+        """Test that the colormapEditor is able to edit a colormap which is not
+        part of the 'prefered colormap'
+        """
+        def getFirstNotPreferredColormap():
+            cms = Colormap.getSupportedColormaps()
+            preferred = preferredColormaps()
+            for cm in cms:
+                if cm not in preferred:
+                    return cm
+            return None
+
+        colormapName = getFirstNotPreferredColormap()
+        assert colormapName is not None
+        colormap = Colormap(name=colormapName)
+        self.colormapDiag.setColormap(colormap)
+        self.colormapDiag.show()
+        self.qapp.processEvents()
+        cb = self.colormapDiag._comboBoxColormap
+        self.assertTrue(cb.getCurrentName() == colormapName)
+        cb.setCurrentIndex(0)
+        index = cb.findLutName(colormapName)
+        assert index != 0  # if 0 then the rest of the test has no sense
+        cb.setCurrentIndex(index)
+        self.assertTrue(cb.getCurrentName() == colormapName)
+
+    def testColormapEditableMode(self):
+        """Test that the colormapDialog is correctly updated when changing the
+        colormap editable status"""
+        colormap = Colormap(normalization='linear', vmin=1.0, vmax=10.0)
+        self.colormapDiag.show()
+        self.qapp.processEvents()
+        self.colormapDiag.setColormap(colormap)
+        for editable in (True, False):
+            with self.subTest(editable=editable):
+                colormap.setEditable(editable)
+                self.assertTrue(
+                    self.colormapDiag._comboBoxColormap.isEnabled() is editable)
+                self.assertTrue(
+                    self.colormapDiag._minValue.isEnabled() is editable)
+                self.assertTrue(
+                    self.colormapDiag._maxValue.isEnabled() is editable)
+                self.assertTrue(
+                    self.colormapDiag._comboBoxNormalization.isEnabled() is editable)
+
+        # Make sure the reset button is also set to enable when edition mode is
+        # False
+        self.colormapDiag.setModal(False)
+        colormap.setEditable(True)
+        self.colormapDiag._comboBoxNormalization.setCurrentIndex(
+            self.colormapDiag._comboBoxNormalization.findData(Colormap.LOGARITHM))
+        resetButton = self.colormapDiag._buttonsNonModal.button(qt.QDialogButtonBox.Reset)
+        self.assertTrue(resetButton.isEnabled())
+        colormap.setEditable(False)
+        self.assertFalse(resetButton.isEnabled())
+
+    def testImageData(self):
+        data = numpy.random.rand(5, 5)
+        self.colormapDiag.setData(data)
+
+    def testEmptyData(self):
+        data = numpy.empty((10, 0))
+        self.colormapDiag.setData(data)
+
+    def testNoneData(self):
+        data = numpy.random.rand(5, 5)
+        self.colormapDiag.setData(data)
+        self.colormapDiag.setData(None)
+
+    def testImageItem(self):
+        """Check that an ImageData plot item can be used"""
+        dialog = self.colormapDiag
+        colormap = Colormap(name='gray', vmin=None, vmax=None)
+        data = numpy.arange(3**2).reshape(3, 3)
+        item = ImageData()
+        item.setData(data, copy=False)
+
+        dialog.setColormap(colormap)
+        dialog.show()
+        self.qapp.processEvents()
+        dialog.setItem(item)
+        vrange = dialog._getFiniteColormapRange()
+        self.assertEqual(vrange, (0, 8))
+
+    def testItemDel(self):
+        """Check that the plot items are not hard linked to the dialog"""
+        dialog = self.colormapDiag
+        colormap = Colormap(name='gray', vmin=None, vmax=None)
+        data = numpy.arange(3**2).reshape(3, 3)
+        item = ImageData()
+        item.setData(data, copy=False)
+
+        dialog.setColormap(colormap)
+        dialog.show()
+        self.qapp.processEvents()
+        dialog.setItem(item)
+        previousRange = dialog._getFiniteColormapRange()
+        del item
+        vrange = dialog._getFiniteColormapRange()
+        self.assertNotEqual(vrange, previousRange)
+
+    def testDataDel(self):
+        """Check that the data are not hard linked to the dialog"""
+        dialog = self.colormapDiag
+        colormap = Colormap(name='gray', vmin=None, vmax=None)
+        data = numpy.arange(5)
+
+        dialog.setColormap(colormap)
+        dialog.show()
+        self.qapp.processEvents()
+        dialog.setData(data)
+        previousRange = dialog._getFiniteColormapRange()
+        del data
+        vrange = dialog._getFiniteColormapRange()
+        self.assertNotEqual(vrange, previousRange)
+
+    def testDeleteWhileExec(self):
+        colormapDiag = self.colormapDiag
+        self.colormapDiag = None
+        qt.QTimer.singleShot(1000, colormapDiag.deleteLater)
+        result = colormapDiag.exec()
+        self.assertEqual(result, 0)