From fb1d14ca195fe835013fc4cd5d623c3140f60e4a Mon Sep 17 00:00:00 2001
From: Qingyu Wang <wangqingyu.c0l1n@bytedance.com>
Date: Fri, 27 Feb 2026 15:38:57 +0800
Subject: [PATCH 1/2] test: ensure proper error handling for invalid config

---
 test/error-handling/index.test.ts | 34 +++++++++++++++++++++++++++++++
 test/error-handling/src/index.js  |  1 +
 2 files changed, 35 insertions(+)
 create mode 100644 test/error-handling/index.test.ts
 create mode 100644 test/error-handling/src/index.js

diff --git a/test/error-handling/index.test.ts b/test/error-handling/index.test.ts
new file mode 100644
index 0000000..dbc13be
--- /dev/null
+++ b/test/error-handling/index.test.ts
@@ -0,0 +1,34 @@
+import { dirname } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { expect, test } from '@playwright/test';
+import { createRsbuild } from '@rsbuild/core';
+import { pluginTailwindCSS } from '../../src';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+test('should fail with clear error when config file is missing', async () => {
+  const rsbuild = await createRsbuild({
+    cwd: __dirname,
+    rsbuildConfig: {
+      plugins: [
+        pluginTailwindCSS({
+          config: './does-not-exist.js',
+        }),
+      ],
+    },
+  });
+
+  // We expect the build to fail
+  try {
+    await rsbuild.build();
+    // If it doesn't fail, fail the test
+    expect(true).toBe(false);
+  } catch (err: unknown) {
+    const error = err as Error;
+    // Check for error message
+    // Rsbuild might wrap the error, so we check for generic failure or specific message
+    expect(error.message).toMatch(
+      /Rspack build failed|Cannot find module|ENOENT|no such file/i,
+    );
+  }
+});
diff --git a/test/error-handling/src/index.js b/test/error-handling/src/index.js
new file mode 100644
index 0000000..75f4f0f
--- /dev/null
+++ b/test/error-handling/src/index.js
@@ -0,0 +1 @@
+console.log('Error handling test');

From 3dfdab52963b92a983373f24cbe167279f0bbc59 Mon Sep 17 00:00:00 2001
From: Qingyu Wang <40660121+colinaaa@users.noreply.github.com>
Date: Fri, 27 Feb 2026 16:15:38 +0800
Subject: [PATCH 2/2] Update test/error-handling/index.test.ts

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
---
 test/error-handling/index.test.ts | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/test/error-handling/index.test.ts b/test/error-handling/index.test.ts
index dbc13be..41c6fe3 100644
--- a/test/error-handling/index.test.ts
+++ b/test/error-handling/index.test.ts
@@ -21,8 +21,7 @@ test('should fail with clear error when config file is missing', async () => {
   // We expect the build to fail
   try {
     await rsbuild.build();
-    // If it doesn't fail, fail the test
-    expect(true).toBe(false);
+    throw new Error('Build was expected to fail, but it succeeded.');
   } catch (err: unknown) {
     const error = err as Error;
     // Check for error message