test: avoid throwing in afterAll hooks

packages/@vue/cli-plugin-typescript/__tests__/tsPlugin.helper.js

@@ -62,7 +62,11 @@ exports.assertBuild = async (name, options, customAssert) => {
   })
 
   afterAll(async () => {
-    await browser.close()
-    server.close()
+    if (browser) {
+      await browser.close()
+    }
+    if (server) {
+      server.close()
+    }
   })
 }

packages/@vue/cli-service-global/__tests__/globalService.spec.js

@@ -76,6 +76,10 @@ test('global build', async () => {
 })
 
 afterAll(async () => {
-  await browser.close()
-  server.close()
+  if (browser) {
+    await browser.close()
+  }
+  if (server) {
+    server.close()
+  }
 })

packages/@vue/cli-service-global/__tests__/globalServiceBuildLib.spec.js

@@ -54,6 +54,10 @@ test('global build --target lib', async () => {
 })
 
 afterAll(async () => {
-  await browser.close()
-  server.close()
+  if (browser) {
+    await browser.close()
+  }
+  if (server) {
+    server.close()
+  }
 })

packages/@vue/cli-service-global/__tests__/globalServiceBuildWc.spec.js

@@ -52,6 +52,10 @@ test('global build --target wc', async () => {
 })
 
 afterAll(async () => {
-  await browser.close()
-  server.close()
+  if (browser) {
+    await browser.close()
+  }
+  if (server) {
+    server.close()
+  }
 })

packages/@vue/cli-service/__tests__/buildLib.spec.js

@@ -10,8 +10,12 @@ const launchPuppeteer = require('@vue/cli-test-utils/launchPuppeteer')
 let server, browser, page
 
 afterEach(async () => {
-  await browser.close()
-  server.close()
+  if (browser) {
+    await browser.close()
+  }
+  if (server) {
+    server.close()
+  }
 })
 
 test('build as lib', async () => {

packages/@vue/cli-service/__tests__/buildWc.spec.js

@@ -90,6 +90,10 @@ test('build as single wc', async () => {
 })
 
 afterEach(async () => {
-  await browser.close()
-  server.close()
+  if (browser) {
+    await browser.close()
+  }
+  if (server) {
+    server.close()
+  }
 })