1 files changed, 64 insertions, 0 deletions

diff --git a/shared/utils/miscs/email.ts b/shared/utils/miscs/email.ts
new file mode 100644
index 000000000..f9f1bd95b
--- /dev/null
+++ b/shared/utils/miscs/email.ts
@@ -0,0 +1,64 @@
+import { fork, ChildProcess } from 'child_process'
+
+class MockSmtpServer {
+
+  private static instance: MockSmtpServer
+  private started = false
+  private emailChildProcess: ChildProcess
+  private emails: object[]
+
+  private constructor () {
+    this.emailChildProcess = fork(`${__dirname}/email-child-process`, [])
+
+    this.emailChildProcess.on('message', (msg) => {
+      if (msg.email) {
+        return this.emails.push(msg.email)
+      }
+    })
+
+    process.on('exit', () => this.kill())
+  }
+
+  collectEmails (emailsCollection: object[]) {
+    return new Promise((res, rej) => {
+      if (this.started) {
+        this.emails = emailsCollection
+        return res()
+      }
+
+      // ensure maildev isn't started until
+      // unexpected exit can be reported to test runner
+      this.emailChildProcess.send({ start: true })
+      this.emailChildProcess.on('exit', () => {
+        return rej(new Error('maildev exited unexpectedly, confirm port not in use'))
+      })
+      this.emailChildProcess.on('message', (msg) => {
+        if (msg.err) {
+          return rej(new Error(msg.err))
+        }
+        this.started = true
+        this.emails = emailsCollection
+        return res()
+      })
+    })
+  }
+
+  kill () {
+    if (!this.emailChildProcess) return
+
+    process.kill(this.emailChildProcess.pid)
+
+    this.emailChildProcess = null
+    MockSmtpServer.instance = null
+  }
+
+  static get Instance () {
+    return this.instance || (this.instance = new this())
+  }
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  MockSmtpServer
+}