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diff --git a/src/silx/gui/plot/test/testSaveAction.py b/src/silx/gui/plot/test/testSaveAction.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.
+#
+# ###########################################################################*/
+"""Test the plot's save action (consistency of output)"""
+
+__authors__ = ["P. Knobel"]
+__license__ = "MIT"
+__date__ = "28/11/2017"
+
+
+import unittest
+import tempfile
+import os
+
+from silx.gui.plot.test.utils import PlotWidgetTestCase
+
+from silx.gui.plot import PlotWidget
+from silx.gui.plot.actions.io import SaveAction
+
+
+class TestSaveActionSaveCurvesAsSpec(unittest.TestCase):
+
+    def setUp(self):
+        self.plot = PlotWidget(backend='none')
+        self.saveAction = SaveAction(plot=self.plot)
+
+        self.tempdir = tempfile.mkdtemp()
+        self.out_fname = os.path.join(self.tempdir, "out.dat")
+
+    def tearDown(self):
+        os.unlink(self.out_fname)
+        os.rmdir(self.tempdir)
+
+    def testSaveMultipleCurvesAsSpec(self):
+        """Test that labels are properly used."""
+        self.plot.setGraphXLabel("graph x label")
+        self.plot.setGraphYLabel("graph y label")
+
+        self.plot.addCurve([0, 1], [1, 2], "curve with labels",
+                           xlabel="curve0 X", ylabel="curve0 Y")
+        self.plot.addCurve([-1, 3], [-6, 2], "curve with X label",
+                           xlabel="curve1 X")
+        self.plot.addCurve([-2, 0], [8, 12], "curve with Y label",
+                           ylabel="curve2 Y")
+        self.plot.addCurve([3, 1], [7, 6], "curve with no labels")
+
+        self.saveAction._saveCurves(self.plot,
+                                    self.out_fname,
+                                    SaveAction.DEFAULT_ALL_CURVES_FILTERS[0])  # "All curves as SpecFile (*.dat)"
+
+        with open(self.out_fname, "rb") as f:
+            file_content = f.read()
+            if hasattr(file_content, "decode"):
+                file_content = file_content.decode()
+
+            # case with all curve labels specified
+            self.assertIn("#S 1 curve0 Y", file_content)
+            self.assertIn("#L curve0 X  curve0 Y", file_content)
+
+            # graph X&Y labels are used when no curve label is specified
+            self.assertIn("#S 2 graph y label", file_content)
+            self.assertIn("#L curve1 X  graph y label", file_content)
+
+            self.assertIn("#S 3 curve2 Y", file_content)
+            self.assertIn("#L graph x label  curve2 Y", file_content)
+
+            self.assertIn("#S 4 graph y label", file_content)
+            self.assertIn("#L graph x label  graph y label", file_content)
+
+
+class TestSaveActionExtension(PlotWidgetTestCase):
+    """Test SaveAction file filter API"""
+
+    def _dummySaveFunction(self, plot, filename, nameFilter):
+        pass
+
+    def testFileFilterAPI(self):
+        """Test addition/update of a file filter"""
+        saveAction = SaveAction(plot=self.plot, parent=self.plot)
+
+        # Add a new file filter
+        nameFilter = 'Dummy file (*.dummy)'
+        saveAction.setFileFilter('all', nameFilter, self._dummySaveFunction)
+        self.assertTrue(nameFilter in saveAction.getFileFilters('all'))
+        self.assertEqual(saveAction.getFileFilters('all')[nameFilter],
+                         self._dummySaveFunction)
+
+        # Add a new file filter at a particular position
+        nameFilter = 'Dummy file2 (*.dummy)'
+        saveAction.setFileFilter('all', nameFilter,
+                                 self._dummySaveFunction, index=3)
+        self.assertTrue(nameFilter in saveAction.getFileFilters('all'))
+        filters = saveAction.getFileFilters('all')
+        self.assertEqual(filters[nameFilter], self._dummySaveFunction)
+        self.assertEqual(list(filters.keys()).index(nameFilter),3)
+
+        # Update an existing file filter
+        nameFilter = SaveAction.IMAGE_FILTER_EDF
+        saveAction.setFileFilter('image', nameFilter, self._dummySaveFunction)
+        self.assertEqual(saveAction.getFileFilters('image')[nameFilter],
+                         self._dummySaveFunction)
+
+        # Change the position of an existing file filter
+        nameFilter = 'Dummy file2 (*.dummy)'
+        oldIndex = list(saveAction.getFileFilters('all')).index(nameFilter)
+        newIndex = oldIndex - 1
+        saveAction.setFileFilter('all', nameFilter,
+                                 self._dummySaveFunction, index=newIndex)
+        filters = saveAction.getFileFilters('all')
+        self.assertEqual(filters[nameFilter], self._dummySaveFunction)
+        self.assertEqual(list(filters.keys()).index(nameFilter), newIndex)