diff --git a/src/listwiz/sorting.py b/src/listwiz/sorting.py
index a24744d..56b8ccc 100644
--- a/src/listwiz/sorting.py
+++ b/src/listwiz/sorting.py
@@ -21,7 +21,7 @@ def merge_sort(l):
     sorted_list
     """
     # If there is a single item, the list is already sorted, return.
-    if len(l) == 1:
+    if len(l) <= 1:
         return l
 
     split = len(l) // 2
diff --git a/tests/test_sorting.py b/tests/test_sorting.py
index 975c572..43f6dbb 100644
--- a/tests/test_sorting.py
+++ b/tests/test_sorting.py
@@ -16,9 +16,10 @@ def test_mergesort():
 
 
 def test_mergesort_empty():
-    # Stub for a test with empty lists, see issue #8
-    pass
-
+    # Test with empty list:
+    l = []
+    res = lws.merge_sort(l)
+    assert res == []
 
 @pytest.mark.parametrize(
     "input_list, expected",