From 9103816eeb3f15cb7015c1e837c59f67b40273f1 Mon Sep 17 00:00:00 2001
From: Johan Holmerin <johan@holmer.in>
Date: Wed, 28 Jul 2021 15:51:30 +0200
Subject: [PATCH] WIP: support Error#cause

Waiting for https://github.com/tc39/proposal-error-cause and
https://github.com/whatwg/html/pull/5749
---
 tests/error.js | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tests/error.js b/tests/error.js
index e2e6543..22314ba 100644
--- a/tests/error.js
+++ b/tests/error.js
@@ -173,4 +173,29 @@ describe("error", function() {
       expect(clonedError.foo).equal(undefined);
     });
   });
+
+  describe("cause", function() {
+    before(function(suite) {
+      let supportsCause = false;
+      new Error("", {
+        get cause() {
+          supportsCause = true;
+        }
+      });
+      if (!supportsCause) suite.skip();
+    });
+
+    it("clones error cause", function() {
+      const error = new Error("test_error", { cause: new Error("cause") });
+      const clonedError = structuredClone(error);
+
+      expect(clonedError).not.to.equal(error);
+      expect(clonedError.cause).not.to.equal(error.cause);
+      expect(clonedError.cause).to.be.an.instanceOf(Error);
+      expect(clonedError.cause.constructor).to.equal(error.cause.constructor);
+      expect(clonedError.cause.message).to.equal(error.cause.message);
+      expect(clonedError.cause.name).to.equal(error.cause.name);
+      expect(clonedError.cause.stack).to.equal(error.cause.stack);
+    });
+  });
 });