From 249f0cd72c50d67697a27d79423c28e07f50d521 Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Sun, 17 Jul 2016 10:16:05 -0700
Subject: [PATCH] Add `_.isEqual` test for transitive equivalence.

---
 test/test.js | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/test/test.js b/test/test.js
index 338579b74..62bc92df9 100644
--- a/test/test.js
+++ b/test/test.js
@@ -9610,6 +9610,20 @@
       assert.strictEqual(_.isEqual(array1, array2), false);
     });
 
+    QUnit.test('should have transitive equivalence for circular references of arrays', function(assert) {
+      assert.expect(3);
+
+      var array1 = [],
+          array2 = [array1],
+          array3 = [array2];
+
+      array1[0] = array1;
+
+      assert.strictEqual(_.isEqual(array1, array2), true);
+      assert.strictEqual(_.isEqual(array2, array3), true);
+      assert.strictEqual(_.isEqual(array1, array3), true);
+    });
+
     QUnit.test('should compare objects with circular references', function(assert) {
       assert.expect(4);
 
@@ -9638,6 +9652,20 @@
       assert.strictEqual(_.isEqual(object1, object2), false);
     });
 
+    QUnit.test('should have transitive equivalence for circular references of objects', function(assert) {
+      assert.expect(3);
+
+      var object1 = {},
+          object2 = { 'a': object1 },
+          object3 = { 'a': object2 };
+
+      object1.a = object1;
+
+      assert.strictEqual(_.isEqual(object1, object2), true);
+      assert.strictEqual(_.isEqual(object2, object3), true);
+      assert.strictEqual(_.isEqual(object1, object3), true);
+    });
+
     QUnit.test('should compare objects with multiple circular references', function(assert) {
       assert.expect(3);