swaf/test/_mail_server.ts

import MailDev, {Mail} from "maildev";

export const MAIL_SERVER = new MailDev({
    ip: '127.0.0.1',
});

export async function setupMailServer(): Promise<void> {
    await new Promise<void>((resolve, reject) => MAIL_SERVER.listen((err?: Error) => {
        if (err) reject(err);
        else resolve();
    }));
}

export async function teardownMailServer(): Promise<void> {
    await new Promise<void>((resolve, reject) => MAIL_SERVER.close((err?: Error) => {
        if (err) reject(err);
        else resolve();
    }));
}

export async function popEmail(): Promise<Record<string, unknown> | null> {
    return await new Promise<Record<string, unknown> | null>((resolve, reject) => {
        MAIL_SERVER.getAllEmail((err: Error | undefined, emails: Mail[]) => {
            if (err) return reject(err);
            if (emails.length === 0) return resolve(null);
            const email = emails[0];

            expect(email).toBeDefined();
            expect(email.id).toBeDefined();
            return resolve(new Promise<Record<string, unknown>>((resolve, reject) => {
                MAIL_SERVER.deleteEmail(email.id as string, (err: Error | undefined) => {
                    if (err) return reject(err);
                    resolve(email as Record<string, unknown>);
                });
            }));
        });
    });
}