From aa73271b87f6861544d102f2572ece649cdd0c7b Mon Sep 17 00:00:00 2001
From: Takuto Wada <takuto.wada@gmail.com>
Date: Wed, 13 Nov 2019 09:37:09 +0900
Subject: [PATCH] feat: If a constructor function is passed to validate the
 instance of errors thrown in assert.throws() or assert.reject(), an assertion
 error will be thrown instead of the original error

refs: https://github.com/nodejs/node/pull/28263
---
 index.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 0fd4d66..5403822 100644
--- a/index.js
+++ b/index.js
@@ -96,7 +96,13 @@ function wantReject (stackStartFn, thennable, errorHandler, message) {
             // Dealing with ES2015 class that extends Error
             // see: https://github.com/nodejs/node/issues/3188
             // see: https://github.com/nodejs/node/pull/4166
-            return reject(actualRejectionResult);
+            return reject(new AssertionError({
+              actual: actualRejectionResult,
+              expected: errorHandler,
+              message: message || 'The error is expected to be an instance of "' + errorHandler.name + '". Received "' + actualRejectionResult.constructor.name + '"\n\nError message:\n\n' + actualRejectionResult.message,
+              operator: stackStartFn.name,
+              stackStartFn: stackStartFn
+            }));
           }
         }
         var handlerFuncResult = errorHandler.call({}, actualRejectionResult);