feat: add jestPuppeteer.resetPage (#183)

packages/jest-environment-puppeteer/README.md

@@ -77,6 +77,16 @@ it('should put test in debug mode', async () => {
 })
 ```
 
+### `global.jestPuppeteer.resetPage()`
+
+Reset global.page
+
+```js
+beforeEach(async () => {
+  await jestPuppeteer.resetPage()
+})
+```
+
 ### `jest-puppeteer.config.js`
 
 You can specify a `jest-puppeteer.config.js` at the root of the project or define a custom path using `JEST_PUPPETEER_CONFIG` environment variable. It should export a config object or a Promise for a config object.

packages/jest-environment-puppeteer/src/PuppeteerEnvironment.js

@@ -57,11 +57,6 @@ class PuppeteerEnvironment extends NodeEnvironment {
       )
     }
 
-    this.global.page = await this.global.context.newPage()
-    if (config && config.exitOnPageError) {
-      this.global.page.addListener('pageerror', handleError)
-    }
-
     this.global.jestPuppeteer = {
       debug: async () => {
         // eslint-disable-next-line no-eval
@@ -102,7 +97,20 @@ class PuppeteerEnvironment extends NodeEnvironment {
           stdin.on('data', onKeyPress)
         })
       },
+      resetPage: async () => {
+        if (this.global.page) {
+          this.global.page.removeListener('pageerror', handleError)
+          await this.global.page.close()
+        }
+
+        this.global.page = await this.global.context.newPage()
+        if (config && config.exitOnPageError) {
+          this.global.page.addListener('pageerror', handleError)
+        }
+      },
     }
+
+    await this.global.jestPuppeteer.resetPage()
   }
 
   async teardown() {

packages/jest-environment-puppeteer/tests/resetPage.test.js

@@ -0,0 +1,9 @@
+describe('resetPage', () => {
+  test('should reset page', async () => {
+    const oldPage = page
+    await jestPuppeteer.resetPage()
+    expect(page).not.toBe(oldPage)
+    expect(page.isClosed()).toBe(false)
+    expect(oldPage.isClosed()).toBe(true)
+  })
+})