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diff --git a/src/silx/gui/plot/test/utils.py b/src/silx/gui/plot/test/utils.py
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+# /*##########################################################################
+#
+# 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 PlotWidget"""
+
+__authors__ = ["T. Vincent"]
+__license__ = "MIT"
+__date__ = "26/01/2018"
+
+
+import logging
+import pytest
+
+from silx.gui.utils.testutils import TestCaseQt
+
+from silx.gui import qt
+from silx.gui.plot import PlotWidget
+
+
+logger = logging.getLogger(__name__)
+
+
+@pytest.mark.usefixtures("test_options_class_attr")
+class PlotWidgetTestCase(TestCaseQt):
+    """Base class for tests of PlotWidget, not a TestCase in itself.
+
+    plot attribute is the PlotWidget created for the test.
+    """
+
+    __screenshot_already_taken = False
+    backend = None
+
+    def _createPlot(self):
+        return PlotWidget(backend=self.backend)
+
+    def setUp(self):
+        super(PlotWidgetTestCase, self).setUp()
+        self.plot = self._createPlot()
+        self.plot.show()
+        self.plotAlive = True
+        self.qWaitForWindowExposed(self.plot)
+        TestCaseQt.mouseClick(self, self.plot, button=qt.Qt.LeftButton, pos=(0, 0))
+
+    def __onPlotDestroyed(self):
+        self.plotAlive = False
+
+    def _waitForPlotClosed(self):
+        self.plot.setAttribute(qt.Qt.WA_DeleteOnClose)
+        self.plot.destroyed.connect(self.__onPlotDestroyed)
+        self.plot.close()
+        del self.plot
+        for _ in range(100):
+            if not self.plotAlive:
+                break
+            self.qWait(10)
+        else:
+            logger.error("Plot is still alive")
+
+    def tearDown(self):
+        if not self._currentTestSucceeded():
+            # MPL is the only widget which uses the real system mouse.
+            # In case of a the windows is outside of the screen, minimzed,
+            # overlapped by a system popup, the MPL widget will not receive the
+            # mouse event.
+            # Taking a screenshot help debuging this cases in the continuous
+            # integration environement.
+            if not PlotWidgetTestCase.__screenshot_already_taken:
+                PlotWidgetTestCase.__screenshot_already_taken = True
+                self.logScreenShot()
+        self.qapp.processEvents()
+        self._waitForPlotClosed()
+        super(PlotWidgetTestCase, self).tearDown()