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diff --git a/silx/gui/plot/_utils/test/test_dtime_ticklayout.py b/silx/gui/plot/_utils/test/test_dtime_ticklayout.py
new file mode 100644
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+++ b/silx/gui/plot/_utils/test/test_dtime_ticklayout.py
@@ -0,0 +1,93 @@
+# coding: utf-8
+# /*##########################################################################
+#
+# Copyright (c) 2015-2018 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.
+#
+# ###########################################################################*/
+
+from __future__ import absolute_import, division, unicode_literals
+
+__authors__ = ["P. Kenter"]
+__license__ = "MIT"
+__date__ = "06/04/2018"
+
+
+import datetime as dt
+import unittest
+
+
+from silx.gui.plot._utils.dtime_ticklayout import (
+    calcTicks, DtUnit, SECONDS_PER_YEAR)
+
+
+class DtTestTickLayout(unittest.TestCase):
+    """Test ticks layout algorithms"""
+
+    def testSmallMonthlySpacing(self):
+        """ Tests a range that did result in a spacing of less than 1 month.
+            It is impossible to add fractional month so the unit must be in days
+        """
+        from dateutil import parser
+        d1 = parser.parse("2017-01-03 13:15:06.000044")
+        d2 = parser.parse("2017-03-08 09:16:16.307584")
+        _ticks, _units, spacing = calcTicks(d1, d2, nTicks=4)
+
+        self.assertEqual(spacing, DtUnit.DAYS)
+
+
+    def testNoCrash(self):
+        """ Creates many combinations of and number-of-ticks and end-dates;
+        tests that it doesn't give an exception and returns a reasonable number
+        of ticks.
+        """
+        d1 = dt.datetime(2017, 1, 3, 13, 15, 6, 44)
+
+        value = 100e-6 # Start at 100 micro sec range.
+
+        while value <= 200 * SECONDS_PER_YEAR:
+
+            d2 = d1 + dt.timedelta(microseconds=value*1e6) # end date range
+
+            for numTicks in range(2, 12):
+                ticks, _, _ = calcTicks(d1, d2, numTicks)
+
+                margin = 2.5
+                self.assertTrue(
+                    numTicks/margin <= len(ticks) <= numTicks*margin,
+                    "Condition {} <= {} <= {} failed for # ticks={} and d2={}:"
+                     .format(numTicks/margin, len(ticks), numTicks * margin,
+                             numTicks, d2))
+
+            value = value * 1.5 # let date period grow exponentially
+
+
+
+
+
+def suite():
+    testsuite = unittest.TestSuite()
+    testsuite.addTest(
+        unittest.defaultTestLoader.loadTestsFromTestCase(DtTestTickLayout))
+    return testsuite
+
+
+if __name__ == '__main__':
+    unittest.main()