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-rw-r--r--js/src/jit-test/tests/basic/testIncDecReadOnly.js22
1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/testIncDecReadOnly.js b/js/src/jit-test/tests/basic/testIncDecReadOnly.js
new file mode 100644
index 0000000000..5ff23b2495
--- /dev/null
+++ b/js/src/jit-test/tests/basic/testIncDecReadOnly.js
@@ -0,0 +1,22 @@
+var r;
+Object.defineProperty(this, "x", {value: 0, writable: false});
+
+for (var a = 0; a < 10; ++a)
+ r = ++x;
+assertEq(x, 0);
+assertEq(r, 1);
+
+for (var a = 0; a < 10; ++a)
+ r = --x;
+assertEq(x, 0);
+assertEq(r, -1);
+
+for (var a = 0; a < 10; ++a)
+ r = x++;
+assertEq(x, 0);
+assertEq(r, 0);
+
+for (var a = 0; a < 10; ++a)
+ r = x--;
+assertEq(x, 0);
+assertEq(r, 0);