From 2115b38fef654c2d7c5998f40967fcfe39d7c515 Mon Sep 17 00:00:00 2001
From: Chris Knight <cknight1234@gmail.com>
Date: Mon, 9 Mar 2020 21:46:55 +0000
Subject: test: add actual error class to fail message (#4305)

---
 std/testing/asserts_test.ts | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

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

diff --git a/std/testing/asserts_test.ts b/std/testing/asserts_test.ts
index 3a846417a..558ce1578 100644
--- a/std/testing/asserts_test.ts
+++ b/std/testing/asserts_test.ts
@@ -230,6 +230,24 @@ test(function testingAssertFail(): void {
   );
 });
 
+test(function testingAssertFailWithWrongErrorClass(): void {
+  assertThrows(
+    (): void => {
+      //This next assertThrows will throw an AssertionError due to the wrong
+      //expected error class
+      assertThrows(
+        (): void => {
+          fail("foo");
+        },
+        Error,
+        "Failed assertion: foo"
+      );
+    },
+    AssertionError,
+    `Expected error to be instance of "Error", but was "AssertionError"`
+  );
+});
+
 const createHeader = (): string[] => [
   "",
   "",
-- 
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