From 26cf5309cbdce5bd099e54b9edf3fce47c69380b Mon Sep 17 00:00:00 2001
From: Ben Newman <ben@benjamn.com>
Date: Tue, 30 Jan 2018 10:45:42 -0500
Subject: [PATCH] Test encoding/decoding immutable tuple objects.

---
 package.json  |  3 ++-
 test/tests.js | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/package.json b/package.json
index a83801f..90e97ea 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
     "debug": "node ./node_modules/mocha/bin/mocha --debug-brk --reporter spec --full-trace"
   },
   "devDependencies": {
-    "mocha": "~5.0.0"
+    "mocha": "~5.0.0",
+    "immutable-tuple": "^0.4.2"
   }
 }
diff --git a/test/tests.js b/test/tests.js
index e6d014e..78e2d8d 100644
--- a/test/tests.js
+++ b/test/tests.js
@@ -128,4 +128,29 @@ describe("encoding and decoding", function () {
     var copy = arson.decode(arson.encode(global));
     assert.strictEqual(copy.global, copy);
   });
+
+  it("should preserve identity of immutable tuples", function () {
+    var tuple = require("immutable-tuple").tuple;
+
+    arson.registerType("tuple", {
+      deconstruct: function (t) {
+        if (tuple.isTuple(t)) {
+          return Array.from(t);
+        }
+      },
+
+      reconstruct: function (entries) {
+        if (entries) {
+          return tuple.apply(null, entries);
+        }
+      }
+    });
+
+    var t1 = tuple(1, 2, tuple(3, 4), 5);
+    var input = ["asdf", t1, true];
+    var output = arson.decode(arson.encode(input));
+
+    assert.notStrictEqual(input, output);
+    assert.strictEqual(output[1], t1);
+  });
 });