From 9eca71caa1674c31f9cc5d4e86c03f10b59e0a00 Mon Sep 17 00:00:00 2001
From: Rob Waller <rdwaller1984@gmail.com>
Date: Tue, 14 Jul 2020 19:41:05 +0100
Subject: fix(std/testing): assertThrows inheritance (#6623)

---
 std/testing/asserts.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'std/testing/asserts.ts')

diff --git a/std/testing/asserts.ts b/std/testing/asserts.ts
index b1164090d..2a1358143 100644
--- a/std/testing/asserts.ts
+++ b/std/testing/asserts.ts
@@ -394,7 +394,7 @@ export function assertThrows<T = void>(
     if (e instanceof Error === false) {
       throw new AssertionError("A non-Error object was thrown.");
     }
-    if (ErrorClass && !(Object.getPrototypeOf(e) === ErrorClass.prototype)) {
+    if (ErrorClass && !(e instanceof ErrorClass)) {
       msg = `Expected error to be instance of "${ErrorClass.name}", but was "${
         e.constructor.name
       }"${msg ? `: ${msg}` : "."}`;
@@ -438,7 +438,7 @@ export async function assertThrowsAsync<T = void>(
     if (e instanceof Error === false) {
       throw new AssertionError("A non-Error object was thrown or rejected.");
     }
-    if (ErrorClass && !(Object.getPrototypeOf(e) === ErrorClass.prototype)) {
+    if (ErrorClass && !(e instanceof ErrorClass)) {
       msg = `Expected error to be instance of "${ErrorClass.name}", but got "${
         e.name
       }"${msg ? `: ${msg}` : "."}`;
-- 
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