1 files changed, 9 insertions, 0 deletions
diff --git a/Lib/test/test_time.py b/Lib/test/test_time.py
index 8c1d8f8..d4f7d80 100644
--- a/Lib/test/test_time.py
+++ b/Lib/test/test_time.py
@@ -233,6 +233,15 @@ class TimeTestCase(unittest.TestCase):
         t1 = time.mktime(lt1)
         self.assertTrue(0 <= (t1-t0) < 0.2)
 
+    def test_mktime(self):
+        # Issue #1726687
+        for t in (-2, -1, 0, 1):
+            try:
+                tt = time.localtime(t)
+            except (OverflowError, ValueError):
+                pass
+            self.assertEqual(time.mktime(tt), t)
+
 class TestLocale(unittest.TestCase):
     def setUp(self):
         self.oldloc = locale.setlocale(locale.LC_ALL)