diff --git a/__tests__/testURL.ts b/__tests__/testURL.ts
index f85cbc19..be247f04 100644
--- a/__tests__/testURL.ts
+++ b/__tests__/testURL.ts
@@ -1,11 +1,11 @@
 // string template function, take input URL string and add a search param
-// example: url`http://g.com` => `http://g.com?k1=v1`
+// example: url`http://g.com` => `http://g.com?k1="json-value"`
 export function testURL(strings: TemplateStringsArray, ...values: unknown[]) {
   const raw = strings.reduce((acc, str, i) => acc + str + (values[i] ?? ''), '')
+  const GITAKO_ACCESS_TOKEN = process.env.GITAKO_ACCESS_TOKEN
+  if (!GITAKO_ACCESS_TOKEN) return raw
+
   const url = new URL(raw, 'http://localhost')
-  url.searchParams.append(
-    'gitako-config-accessToken',
-    JSON.stringify(process.env.GITAKO_ACCESS_TOKEN ?? 'fallback_token'),
-  )
+  url.searchParams.set('gitako-config-accessToken', JSON.stringify(GITAKO_ACCESS_TOKEN))
   return url.href
 }