zero2prod/tests/api/newsletters.rs

use crate::helpers::{ConfirmationLinks, TestApp, assert_is_redirect_to, when_sending_an_email};
use fake::{Fake, faker::internet::en::SafeEmail};
use std::time::Duration;
use uuid::Uuid;
use wiremock::ResponseTemplate;

#[tokio::test]
async fn newsletters_are_not_delivered_to_unconfirmed_subscribers() {
    let app = TestApp::spawn().await;
    create_unconfirmed_subscriber(&app).await;
    app.admin_login().await;

    when_sending_an_email()
        .respond_with(ResponseTemplate::new(200))
        .expect(0)
        .mount(&app.email_server)
        .await;

    let newsletter_request_body = serde_json::json!({
        "title": "Newsletter title",
        "text": "Newsletter body as plain text",
        "html": "<p>Newsletter body as HTML</p>"
    });
    app.post_newsletters(&newsletter_request_body).await;

    app.dispatch_all_pending_emails().await;
}

#[tokio::test]
async fn requests_without_authentication_are_redirected() {
    let app = TestApp::spawn().await;

    when_sending_an_email()
        .respond_with(ResponseTemplate::new(200))
        .expect(0)
        .mount(&app.email_server)
        .await;

    let newsletter_request_body = serde_json::json!({
        "title": "Newsletter title",
        "text": "Newsletter body as plain text",
        "html": "<p>Newsletter body as HTML</p>"
    });
    let response = app.post_newsletters(&newsletter_request_body).await;
    assert_is_redirect_to(&response, "/login");
}

#[tokio::test]
async fn newsletters_are_delivered_to_confirmed_subscribers() {
    let app = TestApp::spawn().await;
    create_confirmed_subscriber(&app).await;
    app.admin_login().await;

    when_sending_an_email()
        .respond_with(ResponseTemplate::new(200))
        .expect(1)
        .mount(&app.email_server)
        .await;

    let newsletter_title = "Newsletter title";
    let newsletter_request_body = serde_json::json!({
        "title": newsletter_title,
        "text": "Newsletter body as plain text",
        "html": "<p>Newsletter body as HTML</p>",
            "idempotency_key": Uuid::new_v4().to_string(),
    });

    let response = app.post_newsletters(&newsletter_request_body).await;
    assert!(response.status().is_success());

    let html_fragment = response.text().await.unwrap();
    assert!(html_fragment.contains(&format!(
        r#"The newsletter issue &#34;{}&#34; has been published"#,
        newsletter_title
    )));

    app.dispatch_all_pending_emails().await;
}

#[tokio::test]
async fn form_shows_error_for_invalid_data() {
    let app = TestApp::spawn().await;
    app.admin_login().await;

    when_sending_an_email()
        .respond_with(ResponseTemplate::new(200))
        .expect(0)
        .mount(&app.email_server)
        .await;

    let test_cases = [
        (
            serde_json::json!({
                "title": "",
                "text": "Newsletter body as plain text",
                "html": "<p>Newsletter body as HTML</p>",
                "idempotency_key": Uuid::new_v4().to_string(),
            }),
            "The title was empty",
        ),
        (
            serde_json::json!({
                "title": "Newsletter",
                "text": "",
                "html": "",
                "idempotency_key": Uuid::new_v4().to_string(),
            }),
            "The content was empty",
        ),
    ];

    for (invalid_body, error_message) in test_cases {
        let html_fragment = app
            .post_newsletters(&invalid_body)
            .await
            .text()
            .await
            .unwrap();
        assert!(html_fragment.contains(error_message));
    }
}

#[tokio::test]
async fn newsletter_creation_is_idempotent() {
    let app = TestApp::spawn().await;
    create_confirmed_subscriber(&app).await;
    app.admin_login().await;

    when_sending_an_email()
        .respond_with(ResponseTemplate::new(200))
        .expect(1)
        .mount(&app.email_server)
        .await;

    let newsletter_title = "Newsletter title";
    let newsletter_request_body = serde_json::json!({
        "title": newsletter_title,
        "text": "Newsletter body as plain text",
        "html": "<p>Newsletter body as HTML</p>",
        "idempotency_key": Uuid::new_v4().to_string(),
    });

    let response = app.post_newsletters(&newsletter_request_body).await;
    assert!(response.status().is_success());

    let html_fragment = response.text().await.unwrap();
    assert!(html_fragment.contains(&format!(
        r#"The newsletter issue &#34;{}&#34; has been published"#,
        newsletter_title
    )));

    let response = app.post_newsletters(&newsletter_request_body).await;
    assert!(response.status().is_success());

    let html_fragment = response.text().await.unwrap();
    assert!(html_fragment.contains(&format!(
        r#"The newsletter issue &#34;{}&#34; has been published"#,
        newsletter_title
    )));

    app.dispatch_all_pending_emails().await;
}

#[tokio::test]
async fn concurrent_form_submission_is_handled_gracefully() {
    let app = TestApp::spawn().await;
    create_confirmed_subscriber(&app).await;
    app.admin_login().await;

    when_sending_an_email()
        .respond_with(ResponseTemplate::new(200).set_delay(Duration::from_secs(2)))
        .expect(1)
        .mount(&app.email_server)
        .await;

    let newsletter_request_body = serde_json::json!({
        "title": "Newsletter title",
        "text": "Newsletter body as plain text",
        "html": "<p>Newsletter body as HTML</p>",
        "idempotency_key": Uuid::new_v4().to_string(),
    });
    let response1 = app.post_newsletters(&newsletter_request_body);
    let response2 = app.post_newsletters(&newsletter_request_body);
    let (response1, response2) = tokio::join!(response1, response2);

    assert_eq!(response1.status(), response2.status());
    assert_eq!(
        response1.text().await.unwrap(),
        response2.text().await.unwrap(),
    );

    app.dispatch_all_pending_emails().await;
}

async fn create_unconfirmed_subscriber(app: &TestApp) -> ConfirmationLinks {
    let email: String = SafeEmail().fake();
    let body = format!("email={email}");

    let _mock_guard = when_sending_an_email()
        .respond_with(ResponseTemplate::new(200))
        .named("Create unconfirmed subscriber")
        .expect(1)
        .mount_as_scoped(&app.email_server)
        .await;

    app.post_subscriptions(body)
        .await
        .error_for_status()
        .unwrap();

    let email_request = &app
        .email_server
        .received_requests()
        .await
        .unwrap()
        .pop()
        .unwrap();

    app.get_confirmation_links(email_request)
}

async fn create_confirmed_subscriber(app: &TestApp) {
    let confirmation_links = create_unconfirmed_subscriber(app).await;
    reqwest::get(confirmation_links.html)
        .await
        .unwrap()
        .error_for_status()
        .unwrap();
}