diff --git a/test/config/store.test.ts b/test/config/store.test.ts
index cc96fdaf..d3052007 100644
--- a/test/config/store.test.ts
+++ b/test/config/store.test.ts
@@ -3,9 +3,9 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { describe, it, afterEach } from 'node:test'
+import { describe, it, beforeEach, afterEach } from 'node:test'
 import assert from 'node:assert/strict'
-import { setResolvedConfig, getResolvedConfig } from '../../src/config/store.ts'
+import { setResolvedConfig, getResolvedConfig, _testResetConfig } from '../../src/config/store.ts'
 import type { ResolvedConfig } from '../../src/config/types.ts'
 
 const sampleConfig: ResolvedConfig = {
@@ -14,9 +14,15 @@ const sampleConfig: ResolvedConfig = {
   },
 }
 
+// The store is a module-level singleton. Under `bun test` all files share one
+// process, so other suites can leave state behind; reset before each test (not
+// just after) so assertions about the initial state are order-independent.
+beforeEach(() => {
+  _testResetConfig()
+})
+
 afterEach(() => {
-  // reset singleton state between tests
-  setResolvedConfig(undefined as unknown as ResolvedConfig)
+  _testResetConfig()
 })
 
 describe('store', () => {