diff --git a/test_time.py b/test_time.py
new file mode 100644
index 0000000..481a1da
--- /dev/null
+++ b/test_time.py
@@ -0,0 +1,9 @@
+import times
+
+def test_given_input():
+    large = times.time_range("2021-01-12 10:00:00", "2021-01-12 12:00:00")
+    short = times.time_range("2021-01-12 10:30:00", "2021-01-12 10:45:00")
+    actual = times.compute_overlap_time(large, short)
+    expected = [('2021-01-12 10:30:00', '2021-01-12 10:45:00')]
+    assert actual == expected
+    
\ No newline at end of file