test: stub provider and environment detection in dev output tests

Author: danielroe

packages/nuxt-cli/test/unit/terminal-output.spec.ts

@@ -12,7 +12,17 @@ import { colourOf, render, screen as visibleScreen } from '../utils/terminal'
 // under test are loaded dynamically below.
 process.env.FORCE_COLOR='3'
 
-vi.mock('std-env',()=>({isCI: false,isTest: false}))
+vi.mock('std-env',()=>({isCI: false,isTest: false,provider: undefined}))
+
+// The suite may itself run inside a container, so the environment the URL block
+// describes is stubbed rather than detected.
+constisolatedEnvironment=vi.hoisted(()=>({current: undefinedasstring|undefined}))
+
+vi.mock('../../src/dev/environment',()=>({
+isDocker: ()=>false,
+isWsl: ()=>false,
+detectIsolatedEnvironment: ()=>isolatedEnvironment.current,
+}))
 
 const{ listen, openBrowser, printQRCode }=awaitimport('../../src/dev/listen')
 const{ setupShortcuts }=awaitimport('../../src/dev/shortcuts')
@@ -53,6 +63,7 @@ describe('dev server terminal output', () => {
 
 afterEach(async()=>{
 awaitPromise.all(listeners.splice(0).map(listener=>listener.close()))
+isolatedEnvironment.current=undefined
 vi.restoreAllMocks()
 })
 
@@ -94,6 +105,16 @@ describe('dev server terminal output', () => {
  `)
 })
 
+it('should say how to reach a loopback server from outside a container',async()=>{
+isolatedEnvironment.current='the container'
+constrenderer=awaitrender(()=>start())
+
+expect(screen(renderer)).toMatchInlineSnapshot(`
+ " ➜ Local: http://localhost:<port>/
+ ➜ Network: use --host to reach this server from outside the container"
+ `)
+})
+
 it('should colour each url type differently',async()=>{
 constrenderer=awaitrender(()=>start())
 renderer.goToFrame(renderer.frames.length-1)