diff --git a/__tests__/cases/non-parallel/project-page.gitako.ts b/__tests__/cases/non-parallel/project-page.gitako.ts
index 6a831a9..8182fda 100644
--- a/__tests__/cases/non-parallel/project-page.gitako.ts
+++ b/__tests__/cases/non-parallel/project-page.gitako.ts
@@ -7,7 +7,7 @@ import {
 } from '../../utils'
 
 describe(`in Gitako project page`, () => {
-  beforeAll(() => page.goto('https://github.com/EnixCoda/Gitako'))
+  beforeAll(() => page.goto('https://github.com/EnixCoda/Gitako/tree/test/200-changed-files-200-lines-each'))
 
   it('should render Gitako', async () => {
     await expectToFind('.gitako-side-bar .gitako-side-bar-body-wrapper')
@@ -22,11 +22,11 @@ describe(`in Gitako project page`, () => {
 
     const filesEle = await page.waitForSelector('.gitako-side-bar .files')
     // node of tsconfig.json should NOT be rendered before scroll down
-    await expectToNotFind(selectFileTreeItem('package.json'))
+    await expectToNotFind(selectFileTreeItem('tsconfig.json'))
     const box = await filesEle?.boundingBox()
     if (box) {
       await page.mouse.move(box.x + 40, box.y + 40)
-      await scroll({ totalDistance: 200, duration: 1000 })
+      await scroll({ totalDistance: 7000, stepDistance: 100 })
 
       // node of tsconfig.json should be rendered now
       await expectToFind(selectFileTreeItem('tsconfig.json'))
diff --git a/__tests__/utils.ts b/__tests__/utils.ts
index b4b3d61..88d5238 100644
--- a/__tests__/utils.ts
+++ b/__tests__/utils.ts
@@ -12,17 +12,14 @@ export function sleep(timeout: number) {
 
 export async function scroll({
   totalDistance,
-  step = 1,
-  duration = 500,
+  stepDistance = 100,
 }: {
   totalDistance: number
-  step?: number
-  duration?: number
+  stepDistance?: number
 }) {
   let distance = 0
-  while ((distance += step) < totalDistance) {
-    await (page.mouse as any).wheel({ deltaY: step })
-    await sleep((duration * step) / totalDistance)
+  while ((distance += stepDistance) < totalDistance) {
+    await (page.mouse as any).wheel({ deltaY: stepDistance })
   }
 }