1 files changed, 33 insertions, 0 deletions

diff --git a/packages/tests/src/shared/mock-servers/shared.ts b/packages/tests/src/shared/mock-servers/shared.ts
new file mode 100644
index 000000000..235642439
--- /dev/null
+++ b/packages/tests/src/shared/mock-servers/shared.ts
@@ -0,0 +1,33 @@
+import { Express } from 'express'
+import { Server } from 'http'
+import { AddressInfo } from 'net'
+
+function randomListen (app: Express) {
+  return new Promise<Server>(res => {
+    const server = app.listen(0, () => res(server))
+  })
+}
+
+function getPort (server: Server) {
+  const address = server.address() as AddressInfo
+
+  return address.port
+}
+
+function terminateServer (server: Server) {
+  if (!server) return Promise.resolve()
+
+  return new Promise<void>((res, rej) => {
+    server.close(err => {
+      if (err) return rej(err)
+
+      return res()
+    })
+  })
+}
+
+export {
+  randomListen,
+  getPort,
+  terminateServer
+}