fix(vitest): correctly rerun test files on change if server was restarted (#4871)

Author: sheremet-va

packages/vitest/src/node/core.ts

@@ -126,7 +126,10 @@ export class Vitest {
  const serverRestart = server.restart
  server.restart = async (...args) => {
  await Promise.all(this._onRestartListeners.map(fn => fn()))
- return await serverRestart(...args)
+ await serverRestart(...args)
+ // watcher is recreated on restart
+ this.unregisterWatcher()
+ this.registerWatcher()
  }
 
  // since we set `server.hmr: false`, Vite does not auto restart itself
@@ -136,6 +139,9 @@ export class Vitest {
  if (isConfig) {
  await Promise.all(this._onRestartListeners.map(fn => fn('config')))
  await serverRestart()
+ // watcher is recreated on restart
+ this.unregisterWatcher()
+ this.registerWatcher()
  }
  })
  }
@@ -729,8 +735,15 @@ export class Vitest {
  }
 
  const projects = this.getModuleProjects(id)
- if (!projects.length)
+ if (!projects.length) {
+ // if there are no modules it's possible that server was restarted
+ // we don't have information about importers anymore, so let's check if the file is a test file at least
+ if (this.state.filesMap.has(id) || this.projects.some(project => project.isTestFile(id))) {
+ this.changedTests.add(id)
+ return [id]
+ }
  return []
+ }
 
  const files: string[] = []