refactor: use __TEST__ flag

packages/global.d.ts

@@ -1,6 +1,6 @@
 // Global compile-time constants
 declare var __DEV__: boolean
-declare var __JSDOM__: boolean
+declare var __TEST__: boolean
 declare var __BROWSER__: boolean
 declare var __RUNTIME_COMPILE__: boolean
 declare var __COMMIT__: string

packages/runtime-core/__tests__/errorHandling.spec.ts

@@ -10,10 +10,19 @@ import {
   mockWarn,
   createComponent
 } from '@vue/runtime-test'
+import { setErrorRecovery } from '../src/errorHandling'
 
 describe('error handling', () => {
   mockWarn()
 
+  beforeEach(() => {
+    setErrorRecovery(true)
+  })
+
+  afterEach(() => {
+    setErrorRecovery(false)
+  })
+
   test('propagation', () => {
     const err = new Error('foo')
     const fn = jest.fn()
@@ -384,9 +393,6 @@ describe('error handling', () => {
   })
 
   it('should warn unhandled', () => {
-    // temporarily simulate non-test env
-    process.env.NODE_ENV = 'dev'
-
     const onError = jest.spyOn(console, 'error')
     onError.mockImplementation(() => {})
     const groupCollapsed = jest.spyOn(console, 'groupCollapsed')
@@ -423,7 +429,6 @@ describe('error handling', () => {
     onError.mockRestore()
     groupCollapsed.mockRestore()
     log.mockRestore()
-    process.env.NODE_ENV = 'test'
   })
 
   // native event handler handling should be tested in respective renderers

packages/runtime-core/src/errorHandling.ts

@@ -126,12 +126,15 @@ export function handleError(
   logError(err, type, contextVNode)
 }
 
+// Test-only toggle for testing the uhandled warning behavior
+let forceRecover = false
+export function setErrorRecovery(value: boolean) {
+  forceRecover = value
+}
+
 function logError(err: Error, type: ErrorTypes, contextVNode: VNode | null) {
   // default behavior is crash in prod & test, recover in dev.
-  if (
-    __DEV__ &&
-    !(typeof process !== 'undefined' && process.env.NODE_ENV === 'test')
-  ) {
+  if (__DEV__ && (forceRecover || !__TEST__)) {
     const info = ErrorTypeStrings[type]
     if (contextVNode) {
       pushWarningContext(contextVNode)

packages/runtime-core/src/warning.ts

@@ -53,7 +53,7 @@ export function warn(msg: string, ...args: any[]) {
     if (
       trace.length &&
       // avoid spamming console during tests
-      (typeof process === 'undefined' || process.env.NODE_ENV !== 'test')
+      !__TEST__
     ) {
       warnArgs.push(`\n`, ...formatTrace(trace))
     }