diff --git a/tests/test_compare.py b/tests/test_compare.py
new file mode 100644
index 0000000..11a81d4
--- /dev/null
+++ b/tests/test_compare.py
@@ -0,0 +1,84 @@
+#!/usr/bin/env python3
+
+#    Copyright (C) 2017 Christian Thomas Jacobs.
+
+#    This file is part of PyQSO.
+
+#    PyQSO is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    PyQSO is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with PyQSO.  If not, see <http://www.gnu.org/licenses/>.
+
+from gi.repository import Gtk
+import unittest
+from pyqso.compare import *
+
+
+class TestCompare(unittest.TestCase):
+
+    def setUp(self):
+        data_types = [int] + [str]*3
+        self.model = Gtk.ListStore(*data_types)
+        row1 = [0, "100", "20150323", "1433"]
+        self.model.append(row1)
+        row2 = [1, "5000", "20160423", "1432"]
+        self.model.append(row2)
+        row3 = [2, "5000", "20160423", "1433"]
+        self.model.append(row3)
+        row4 = [2, "25", "20160423", "1433"]
+        self.model.append(row4)
+        return
+
+    def tearDown(self):
+        return
+
+    def test_compare_default(self):
+        """ Check the correctness of the default comparison scheme. """
+
+        # Get the row iterables.
+        path = Gtk.TreePath(0)
+        iter1 = self.model.get_iter(path)
+        iter2 = self.model.iter_next(iter1)
+        iter3 = self.model.iter_next(iter2)
+        iter4 = self.model.iter_next(iter3)
+
+        # Compare values in the second column.
+        column_index = 1
+        result = compare_default(self.model, iter1, iter2, column_index)
+        assert(result == 1)
+        result = compare_default(self.model, iter2, iter3, column_index)
+        assert(result == 0)
+        result = compare_default(self.model, iter3, iter4, column_index)
+        assert(result == -1)
+
+    def test_compare_date_and_time(self):
+        """ Check that dates in yyyymmdd format are compared correctly. """
+
+        # Get the row iterables.
+        path = Gtk.TreePath(0)
+        iter1 = self.model.get_iter(path)
+        iter2 = self.model.iter_next(iter1)
+        iter3 = self.model.iter_next(iter2)
+        iter4 = self.model.iter_next(iter3)
+
+        # Compare values in the third (and fourth, if necessary) column.
+        column_index = 2
+        result = compare_date_and_time(self.model, iter1, iter2, [column_index, column_index+1])
+        assert(result == 1)
+        result = compare_date_and_time(self.model, iter2, iter3, [column_index, column_index+1])
+        assert(result == 1)
+        result = compare_date_and_time(self.model, iter3, iter4, [column_index, column_index+1])
+        assert(result == 0)
+        result = compare_date_and_time(self.model, iter4, iter1, [column_index, column_index+1])
+        assert(result == -1)
+
+if(__name__ == '__main__'):
+    unittest.main()