Add m-esr52 at 52.6.0

1 files changed, 27 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Symbol/toString.js b/js/src/tests/ecma_6/Symbol/toString.js
new file mode 100644
index 000000000..b7bbda876
--- /dev/null
+++ b/js/src/tests/ecma_6/Symbol/toString.js
@@ -0,0 +1,27 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/ */
+
+var cases = [
+    {sym: Symbol(), str: "Symbol()"},
+    {sym: Symbol("ok"), str: "Symbol(ok)"},
+    {sym: Symbol("\0"), str: "Symbol(\0)"},
+    {sym: Symbol.iterator, str: "Symbol(Symbol.iterator)"},
+    {sym: Symbol.for("dummies"), str: "Symbol(dummies)"}
+];
+
+// Symbol.prototype.toString works on both primitive symbols and Symbol
+// objects.
+for (var test of cases) {
+    assertEq(test.sym.toString(), test.str);
+    assertEq(Object(test.sym).toString(), test.str);
+}
+
+// Any other value throws.
+var nonsymbols = [
+    undefined, null, "not-ok", new String("still-not-ok"), {}, []
+];
+for (var nonsym of nonsymbols)
+    assertThrowsInstanceOf(() => Symbol.prototype.toString.call(nonsym), TypeError);
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);