feat: rename vitest.config.ts to avoid warning; add empty caseConfig … (

#561)

* feat: rename vitest.config.ts to avoid warning; add empty caseConfig warning info

* chore: fmt

---------

Co-authored-by: pengbo43 <pengbo43@jd.com>

packages/rolldown/test/runner.ts

@@ -1,4 +1,5 @@
-import { describe, expect, test } from 'vitest'
+import { describe, test } from 'vitest'
+import { yellow } from 'colorette'
 import { InputOptions, OutputOptions, RollupOptions, rolldown } from 'rolldown'
 import path from 'node:path'
 import fs from 'node:fs'
@@ -16,7 +17,11 @@ function runCases() {
 
       for (const subCaseName of subCases) {
         const caseRoot = path.join(subCasesRoot, subCaseName)
-        const { config, afterTest } = await getCaseConfig(caseRoot)
+        const caseConfig = await getCaseConfig(caseRoot)
+        if (!caseConfig) {
+          console.log(yellow(`[config] is empty in ${caseRoot}`))
+        }
+        const { config, afterTest } = caseConfig || {}
 
         test(subCaseName, async () => {
           const output = await runCaseBundle(caseRoot, config)