Add m-esr52 at 52.6.0

1 files changed, 27 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Set/symbols.js b/js/src/tests/ecma_6/Set/symbols.js
new file mode 100644
index 000000000..364b3155c
--- /dev/null
+++ b/js/src/tests/ecma_6/Set/symbols.js
@@ -0,0 +1,27 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/ */
+
+var s = new Set;
+
+// Symbols can be stored in Sets.
+var sym = Symbol();
+s.add(sym);
+assertEq(s.has(sym), true);
+assertEq(s.has(Symbol()), false);
+assertEq([...s][0], sym);
+s.add(sym);
+assertEq(s.has(sym), true);
+assertEq(s.size, 1);
+s.delete(sym);
+assertEq(s.has(sym), false);
+assertEq(s.size, 0);
+
+// Symbols returned by Symbol.for() can be in Sets.
+var str = "how much wood would a woodchuck chuck if a woodchuck could chuck wood";
+var s2  = "how much wood would a woodchuck chuck if could";
+var arr = [for (word of str.split(" ")) Symbol.for(word)];
+s = new Set(arr);
+assertDeepEq([...s], [for (word of s2.split(" ")) Symbol.for(word)]);
+
+if (typeof reportCompare === "function")
+  reportCompare(0, 0);