From 62b6f31aad01164fd3112807565447e3ac4e7bab Mon Sep 17 00:00:00 2001
From: IgnusG <6438760+IgnusG@users.noreply.github.com>
Date: Sun, 4 Sep 2022 15:04:23 +0200
Subject: [PATCH] fix: show diff for errors that contain actual/expected
 without showDiff

---
 packages/vitest/src/node/error.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/vitest/src/node/error.ts b/packages/vitest/src/node/error.ts
index d9dbc42de956..d6a60504b2d0 100644
--- a/packages/vitest/src/node/error.ts
+++ b/packages/vitest/src/node/error.ts
@@ -69,7 +69,8 @@ export async function printError(error: unknown, ctx: Vitest, options: PrintErro
 
   handleImportOutsideModuleError(e.stack || e.stackStr || '', ctx)
 
-  if (e.showDiff) {
+  // Eg. AssertionError from assert does not set showDiff but has both actual and expected properties
+  if (e.showDiff || (e.showDiff === undefined && e.actual && e.expected)) {
     displayDiff(stringify(e.actual), stringify(e.expected), ctx.logger.console, {
       outputTruncateLength: ctx.config.outputTruncateLength,
       outputDiffLines: ctx.config.outputDiffLines,