From 431782bcd6851fe8d4281a05d2115f180be86efa Mon Sep 17 00:00:00 2001
From: Linus Groh <mail@linusgroh.de>
Date: Tue, 11 May 2021 22:41:35 +0100
Subject: [PATCH] LibJS/Tests: Add details for toThrowWithMessage() expectation
 error

---
 Userland/Libraries/LibJS/Tests/test-common.js | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/Userland/Libraries/LibJS/Tests/test-common.js b/Userland/Libraries/LibJS/Tests/test-common.js
index 271dcd4363..64e1051889 100644
--- a/Userland/Libraries/LibJS/Tests/test-common.js
+++ b/Userland/Libraries/LibJS/Tests/test-common.js
@@ -298,8 +298,18 @@ class ExpectationError extends Error {
                     this.target();
                     this.__expect(false);
                 } catch (e) {
-                    this.__expect(e instanceof class_);
-                    this.__expect(e.message.includes(message));
+                    this.__expect(
+                        e instanceof class_,
+                        () =>
+                            `Expected error to be instance of ${class_.name}, got ${String(e.name)}`
+                    );
+                    this.__expect(
+                        e.message.includes(message),
+                        () =>
+                            `Expected error message to include _${String(message)}_, got _${String(
+                                e.message
+                            )}_`
+                    );
                 }
             });
         }