Add m-esr52 at 52.6.0

1 files changed, 30 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Symbol/equality.js b/js/src/tests/ecma_6/Symbol/equality.js
new file mode 100644
index 000000000..eaa091ba4
--- /dev/null
+++ b/js/src/tests/ecma_6/Symbol/equality.js
@@ -0,0 +1,30 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/ */
+
+// Symbol.for returns the same symbol whenever the same argument is passed.
+assertEq(Symbol.for("q") === Symbol.for("q"), true);
+
+// Several distinct Symbol values.
+var symbols = [
+    Symbol(),
+    Symbol("Symbol.iterator"),
+    Symbol("Symbol.iterator"),  // distinct new symbol with the same description
+    Symbol.for("Symbol.iterator"),
+    Symbol.iterator
+];
+
+// Distinct symbols are never equal to each other, even if they have the same
+// description.
+for (var i = 0; i < symbols.length; i++) {
+    for (var j = i; j < symbols.length; j++) {
+        var expected = (i === j);
+        assertEq(symbols[i] == symbols[j], expected);
+        assertEq(symbols[i] != symbols[j], !expected);
+        assertEq(symbols[i] === symbols[j], expected);
+        assertEq(symbols[i] !== symbols[j], !expected);
+        assertEq(Object.is(symbols[i], symbols[j]), expected);
+    }
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);