1 files changed, 15 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/collections/Set-delete-size.js b/js/src/jit-test/tests/collections/Set-delete-size.js
new file mode 100644
index 0000000000..524978b817
--- /dev/null
+++ b/js/src/jit-test/tests/collections/Set-delete-size.js
@@ -0,0 +1,15 @@
+// set.delete(v) decrements set.size iff the set contained v.
+
+var s = new Set();
+for (var i = 0; i < 10; i++)
+    s.add(i);
+
+for (var i = 10; i > 0; i--) {
+    assertEq(s.size, i);
+    assertEq(s.delete(i), false);
+    assertEq(s.size, i);
+    assertEq(s.delete(i - 1), true);
+    assertEq(s.size, i - 1);
+    assertEq(s.delete(i - 1), false);
+    assertEq(s.size, i - 1);
+}