diff --git a/test/testSortStability.krk b/test/testSortStability.krk
new file mode 100644
index 0000000..8892bb8
--- /dev/null
+++ b/test/testSortStability.krk
@@ -0,0 +1,21 @@
+class R:
+    def __init__(self, name, department, age):
+        self.name = name
+        self.department = department
+        self.age = age
+    def __repr__(self):
+        return f'Record({self.name},{self.department},{self.age})'
+
+def __main__(RS,ds,ages,names):
+    for i in range(50):
+        RS.append(R(names[i%5],ds[i%3],ages[i%17]))
+
+    print(RS)
+    RS.sort(key=lambda l: l.age)
+    print(RS)
+    RS.sort(key=lambda l: l.department)
+    print(RS)
+    RS.sort(key=lambda l: l.age, reverse=True)
+    print(RS)
+
+__main__([], ['Engineering', 'Sales', 'Management'], [n for n in range(30,47)], ['Bob','Dan','Eric','Sue','Tina'])
diff --git a/test/testSortStability.krk.expect b/test/testSortStability.krk.expect
new file mode 100644
index 0000000..059aa5f
--- /dev/null
+++ b/test/testSortStability.krk.expect
@@ -0,0 +1,4 @@
+[Record(Bob,Engineering,30), Record(Dan,Sales,31), Record(Eric,Management,32), Record(Sue,Engineering,33), Record(Tina,Sales,34), Record(Bob,Management,35), Record(Dan,Engineering,36), Record(Eric,Sales,37), Record(Sue,Management,38), Record(Tina,Engineering,39), Record(Bob,Sales,40), Record(Dan,Management,41), Record(Eric,Engineering,42), Record(Sue,Sales,43), Record(Tina,Management,44), Record(Bob,Engineering,45), Record(Dan,Sales,46), Record(Eric,Management,30), Record(Sue,Engineering,31), Record(Tina,Sales,32), Record(Bob,Management,33), Record(Dan,Engineering,34), Record(Eric,Sales,35), Record(Sue,Management,36), Record(Tina,Engineering,37), Record(Bob,Sales,38), Record(Dan,Management,39), Record(Eric,Engineering,40), Record(Sue,Sales,41), Record(Tina,Management,42), Record(Bob,Engineering,43), Record(Dan,Sales,44), Record(Eric,Management,45), Record(Sue,Engineering,46), Record(Tina,Sales,30), Record(Bob,Management,31), Record(Dan,Engineering,32), Record(Eric,Sales,33), Record(Sue,Management,34), Record(Tina,Engineering,35), Record(Bob,Sales,36), Record(Dan,Management,37), Record(Eric,Engineering,38), Record(Sue,Sales,39), Record(Tina,Management,40), Record(Bob,Engineering,41), Record(Dan,Sales,42), Record(Eric,Management,43), Record(Sue,Engineering,44), Record(Tina,Sales,45)]
+[Record(Bob,Engineering,30), Record(Eric,Management,30), Record(Tina,Sales,30), Record(Dan,Sales,31), Record(Sue,Engineering,31), Record(Bob,Management,31), Record(Eric,Management,32), Record(Tina,Sales,32), Record(Dan,Engineering,32), Record(Sue,Engineering,33), Record(Bob,Management,33), Record(Eric,Sales,33), Record(Tina,Sales,34), Record(Dan,Engineering,34), Record(Sue,Management,34), Record(Bob,Management,35), Record(Eric,Sales,35), Record(Tina,Engineering,35), Record(Dan,Engineering,36), Record(Sue,Management,36), Record(Bob,Sales,36), Record(Eric,Sales,37), Record(Tina,Engineering,37), Record(Dan,Management,37), Record(Sue,Management,38), Record(Bob,Sales,38), Record(Eric,Engineering,38), Record(Tina,Engineering,39), Record(Dan,Management,39), Record(Sue,Sales,39), Record(Bob,Sales,40), Record(Eric,Engineering,40), Record(Tina,Management,40), Record(Dan,Management,41), Record(Sue,Sales,41), Record(Bob,Engineering,41), Record(Eric,Engineering,42), Record(Tina,Management,42), Record(Dan,Sales,42), Record(Sue,Sales,43), Record(Bob,Engineering,43), Record(Eric,Management,43), Record(Tina,Management,44), Record(Dan,Sales,44), Record(Sue,Engineering,44), Record(Bob,Engineering,45), Record(Eric,Management,45), Record(Tina,Sales,45), Record(Dan,Sales,46), Record(Sue,Engineering,46)]
+[Record(Bob,Engineering,30), Record(Sue,Engineering,31), Record(Dan,Engineering,32), Record(Sue,Engineering,33), Record(Dan,Engineering,34), Record(Tina,Engineering,35), Record(Dan,Engineering,36), Record(Tina,Engineering,37), Record(Eric,Engineering,38), Record(Tina,Engineering,39), Record(Eric,Engineering,40), Record(Bob,Engineering,41), Record(Eric,Engineering,42), Record(Bob,Engineering,43), Record(Sue,Engineering,44), Record(Bob,Engineering,45), Record(Sue,Engineering,46), Record(Eric,Management,30), Record(Bob,Management,31), Record(Eric,Management,32), Record(Bob,Management,33), Record(Sue,Management,34), Record(Bob,Management,35), Record(Sue,Management,36), Record(Dan,Management,37), Record(Sue,Management,38), Record(Dan,Management,39), Record(Tina,Management,40), Record(Dan,Management,41), Record(Tina,Management,42), Record(Eric,Management,43), Record(Tina,Management,44), Record(Eric,Management,45), Record(Tina,Sales,30), Record(Dan,Sales,31), Record(Tina,Sales,32), Record(Eric,Sales,33), Record(Tina,Sales,34), Record(Eric,Sales,35), Record(Bob,Sales,36), Record(Eric,Sales,37), Record(Bob,Sales,38), Record(Sue,Sales,39), Record(Bob,Sales,40), Record(Sue,Sales,41), Record(Dan,Sales,42), Record(Sue,Sales,43), Record(Dan,Sales,44), Record(Tina,Sales,45), Record(Dan,Sales,46)]
+[Record(Sue,Engineering,46), Record(Dan,Sales,46), Record(Bob,Engineering,45), Record(Eric,Management,45), Record(Tina,Sales,45), Record(Sue,Engineering,44), Record(Tina,Management,44), Record(Dan,Sales,44), Record(Bob,Engineering,43), Record(Eric,Management,43), Record(Sue,Sales,43), Record(Eric,Engineering,42), Record(Tina,Management,42), Record(Dan,Sales,42), Record(Bob,Engineering,41), Record(Dan,Management,41), Record(Sue,Sales,41), Record(Eric,Engineering,40), Record(Tina,Management,40), Record(Bob,Sales,40), Record(Tina,Engineering,39), Record(Dan,Management,39), Record(Sue,Sales,39), Record(Eric,Engineering,38), Record(Sue,Management,38), Record(Bob,Sales,38), Record(Tina,Engineering,37), Record(Dan,Management,37), Record(Eric,Sales,37), Record(Dan,Engineering,36), Record(Sue,Management,36), Record(Bob,Sales,36), Record(Tina,Engineering,35), Record(Bob,Management,35), Record(Eric,Sales,35), Record(Dan,Engineering,34), Record(Sue,Management,34), Record(Tina,Sales,34), Record(Sue,Engineering,33), Record(Bob,Management,33), Record(Eric,Sales,33), Record(Dan,Engineering,32), Record(Eric,Management,32), Record(Tina,Sales,32), Record(Sue,Engineering,31), Record(Bob,Management,31), Record(Dan,Sales,31), Record(Bob,Engineering,30), Record(Eric,Management,30), Record(Tina,Sales,30)]