updated error comparison method in deepEqual

related to hapijs#213 Updated based on [nodejs/node#15001](https://github.com/nodejs/node/pull/15001/files#diff-f76cd6d4ba3dad8b6b9a393af1fce15bR202)
Ondama · Oct 5, 2017 · 32113fd · 32113fd
1 parent 5e61577
commit 32113fd
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diff --git a/lib/index.js b/lib/index.js
@@ -337,6 +337,10 @@ exports.deepEqual = function (obj, ref, options, seen) {
         return (ref instanceof RegExp && obj.toString() === ref.toString());
     }
 
+    if (obj instanceof Error) {
+        return (ref instanceof Error && obj.message === ref.message);
+    }
+
     if (options.prototype) {
         if (Object.getPrototypeOf(obj) !== Object.getPrototypeOf(ref)) {
             return false;

diff --git a/test/index.js b/test/index.js
@@ -1031,6 +1031,11 @@ describe('deepEqual()', () => {
         compare();
     });
 
+    it('compares errors', async () => {
+
+        expect(Hoek.deepEqual(new Error(), new Error())).to.be.true();
+    });
+
     it('compares dates', async () => {
 
         expect(Hoek.deepEqual(new Date(2015, 1, 1), new Date(2015, 1, 1))).to.be.true();