Add SMTP admin settings and contact form delivery

tests/mail.test.ts

@@ -0,0 +1,130 @@
+import { describe, expect, it, vi } from "vitest";
+
+import type { MailSettings } from "../lib/mail-settings";
+import { sendContactMessage, sendTestEmail } from "../lib/mail";
+
+function createMailSettings(overrides: Partial<MailSettings> = {}): MailSettings {
+  return {
+    smtp: {
+      host: "smtp.example.com",
+      port: 587,
+      secure: false,
+      username: "mailer@example.com",
+      password: "secret",
+      ...overrides.smtp,
+    },
+    sender: {
+      email: "hello@example.com",
+      name: "Studio Moh",
+      ...overrides.sender,
+    },
+    recipients: {
+      contact: "contact@example.com",
+      test: "test@example.com",
+      ...overrides.recipients,
+    },
+  };
+}
+
+describe("mail delivery", () => {
+  it("sends contact messages with reply-to", async () => {
+    const sendMailMock = vi.fn().mockResolvedValue({});
+    const createTransport = vi.fn().mockReturnValue({
+      sendMail: sendMailMock,
+    });
+
+    await sendContactMessage(
+      {
+        locale: "en",
+        name: "Jane Doe",
+        email: "jane@example.com",
+        message: "Hello from the website contact form.",
+      },
+      {
+        settings: createMailSettings(),
+        createTransport,
+      },
+    );
+
+    expect(createTransport).toHaveBeenCalledWith({
+      host: "smtp.example.com",
+      port: 587,
+      secure: false,
+      auth: {
+        user: "mailer@example.com",
+        pass: "secret",
+      },
+    });
+    expect(sendMailMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        to: "contact@example.com",
+        subject: "New contact message",
+        replyTo: "jane@example.com",
+      }),
+    );
+    expect(sendMailMock.mock.calls[0]?.[0].text).toContain("Hello from the website contact form.");
+  });
+
+  it("falls back to the test recipient when contact recipient is empty", async () => {
+    const sendMailMock = vi.fn().mockResolvedValue({});
+    const createTransport = vi.fn().mockReturnValue({
+      sendMail: sendMailMock,
+    });
+
+    await sendContactMessage(
+      {
+        locale: "de",
+        name: "Jane Doe",
+        email: "jane@example.com",
+        message: "Fallback recipient should still work.",
+      },
+      {
+        settings: createMailSettings({
+          recipients: {
+            contact: "",
+            test: "fallback@example.com",
+          },
+        }),
+        createTransport,
+      },
+    );
+
+    expect(sendMailMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        to: "fallback@example.com",
+      }),
+    );
+  });
+
+  it("sends backend test emails to the configured recipient", async () => {
+    const sendMailMock = vi.fn().mockResolvedValue({});
+    const createTransport = vi.fn().mockReturnValue({
+      sendMail: sendMailMock,
+    });
+
+    await sendTestEmail({
+      settings: createMailSettings(),
+      createTransport,
+    });
+
+    expect(sendMailMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        to: "test@example.com",
+        subject: "SMTP test email",
+      }),
+    );
+  });
+
+  it("fails when the transport rejects the test email", async () => {
+    const createTransport = vi.fn().mockReturnValue({
+      sendMail: vi.fn().mockRejectedValue(new Error("Authentication failed.")),
+    });
+
+    await expect(
+      sendTestEmail({
+        settings: createMailSettings(),
+        createTransport,
+      }),
+    ).rejects.toThrow("Authentication failed.");
+  });
+});