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-rw-r--r--js/src/jit-test/tests/collections/Map-size.js6
1 files changed, 6 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/collections/Map-size.js b/js/src/jit-test/tests/collections/Map-size.js
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index 0000000000..12cb6e7358
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+++ b/js/src/jit-test/tests/collections/Map-size.js
@@ -0,0 +1,6 @@
+// Each Map has its own size.
+
+var m1 = new Map(), m2 = new Map();
+m1.set("x", 3);
+assertEq(m1.size, 1);
+assertEq(m2.size, 0);