diff --git a/site-lisp/timeline-tools-test.el b/site-lisp/timeline-tools-test.el
index f0c87fd..0f57156 100644
--- a/site-lisp/timeline-tools-test.el
+++ b/site-lisp/timeline-tools-test.el
@@ -101,3 +101,37 @@ CLOCK: [2018-01-08 Mon 16:00]--[2018-01-08 Mon 16:15] =>  0:15
                      ((1515334380.0 . 1515338220.0)
                       (1515423600.0 . 1515424500.0)))))))
 
+(ert-deftest timeline-tools-test-clockline-no-conflict-1 ()
+  "Test `timeline-tools-clockline-no-conflict’ with complex example."
+  (with-temp-buffer
+    (insert "
+* Task 1
+:LOGBOOK:
+CLOCK: [2018-01-07 Sun 13:15]--[2018-01-07 Sun 14:00] => 0:45
+CLOCK: [2018-01-08 Mon 16:15]--[2018-01-10 Wed 13:10] => 44:55
+CLOCK: [2018-01-10 Wed 10:07]--[2018-01-12 Fri 14:00] => 51:53
+:END:
+
+* Task 2
+:LOGBOOK:
+CLOCK: [2018-01-07 Sun 15:13]--[2018-01-07 Sun 16:17] =>  1:04
+CLOCK: [2018-01-08 Mon 16:00]--[2018-01-08 Mon 16:15] =>  0:15
+:END:
+")
+    (org-mode)
+    (should (equal (timeline-tools-clockline-no-conflict
+                    (org-time-string-to-seconds "[2018-01-07 Sun 13:00]")
+                    (org-time-string-to-seconds "[2018-01-11 Thu 13:33]")
+                    (current-buffer))
+                   "CLOCK: [2018-01-07 Sun 13:00]--[2018-01-11 Thu 13:33] => 96:33"))
+    (should (equal (buffer-string)
+                   "
+* Task 1
+:LOGBOOK:
+CLOCK: [2018-01-11 Thu 13:33]--[2018-01-12 Fri 14:00] => 24:27
+:END:
+
+* Task 2
+:LOGBOOK:
+:END:
+"))))