1 files changed, 38 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Statements/property-reference-self-assignment.js b/js/src/tests/ecma_6/Statements/property-reference-self-assignment.js
new file mode 100644
index 000000000..81c95b9cf
--- /dev/null
+++ b/js/src/tests/ecma_6/Statements/property-reference-self-assignment.js
@@ -0,0 +1,38 @@
+var hits = 0;
+
+var p = { toString() { hits++; return "prop" } };
+var obj = { foo: 1 };
+
+
+var ops = [["obj[p]++", 2],
+           ["++obj[p]", 2],
+           ["--obj[p]", 0],
+           ["obj[p]--", 0],
+           ["obj[p] += 2", 3],
+           ["obj[p] -= 2", -1],
+           ["obj[p] *= 2", 2],
+           ["obj[p] /= 2", 0.5],
+           ["obj[p] %= 2", 1],
+           ["obj[p] >>>= 2", 0],
+           ["obj[p] >>= 2", 0],
+           ["obj[p] <<= 2", 4],
+           ["obj[p] |= 2", 3],
+           ["obj[p] ^= 2", 3],
+           ["obj[p] &= 2", 0]];
+
+var testHits = 0;
+for (let op of ops) {
+    // Seed the value for each test.
+    obj.prop = 1;
+
+    // Do the operation.
+    eval(op[0]);
+    assertEq(obj.prop, op[1]);
+
+    // We should always call toString once, for each operation.
+    testHits++;
+    assertEq(hits, testHits);
+}
+
+if (typeof reportCompare === 'function')
+    reportCompare(0,0,"OK");