zero2prod/tests/api/subscriptions.rs

use crate::helpers::{TestApp, assert_is_redirect_to};
use wiremock::{
    Mock, ResponseTemplate,
    matchers::{method, path},
};

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

    Mock::given(path("/v1/email"))
        .and(method("POST"))
        .respond_with(ResponseTemplate::new(200))
        .mount(&app.email_server)
        .await;

    let email = "alphonse.paix@outlook.com";
    let body = format!("name=Alphonse&email={0}&email_check={0}", email);
    let response = app.post_subscriptions(body).await;

    assert_is_redirect_to(&response, "/register");
    let page_html = app.get_register_html().await;
    assert!(page_html.contains("A confirmation email has been sent"));
}

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

    Mock::given(path("/v1/email"))
        .and(method("POST"))
        .respond_with(ResponseTemplate::new(200))
        .mount(&app.email_server)
        .await;

    let email = "alphonse.paix@outlook.com";
    let body = format!("email={email}");
    let response = app.post_subscriptions(body).await;

    assert_is_redirect_to(&response, "/register");
    let page_html = app.get_register_html().await;
    assert!(page_html.contains("A confirmation email has been sent"));

    let saved = sqlx::query!("SELECT email, status FROM subscriptions")
        .fetch_one(&app.connection_pool)
        .await
        .expect("Failed to fetch saved subscription");

    assert_eq!(saved.email, "alphonse.paix@outlook.com");
    assert_eq!(saved.status, "pending_confirmation");
}

#[tokio::test]
async fn subscribe_returns_a_422_when_data_is_missing() {
    let app = TestApp::spawn().await;

    let response = app.post_subscriptions(String::new()).await;

    assert_eq!(
        422,
        response.status().as_u16(),
        "the API did not fail with 422 Unprocessable Entity when the payload was missing the email"
    );
}

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

    let test_cases = [
        ("name=&email=alphonse.paix%40outlook.com", "an empty name"),
        ("name=Alphonse&email=&email_check=", "an empty email"),
        (
            "name=Alphonse&email=not-an-email&email_check=not-an_email",
            "an invalid email",
        ),
        (
            "name=Alphonse&email=alphonse.paix@outlook.com&email_check=alphonse.paix@outlook.fr",
            "two different email addresses",
        ),
    ];
    for (body, description) in test_cases {
        let response_text = app
            .post_subscriptions(body.into())
            .await
            .text()
            .await
            .unwrap();

        assert!(
            !response_text.contains("Your account has been confirmed"),
            "the API did not displayed an error message when the payload had an {}.",
            description
        );
    }
}

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

    let email = "alphonse.paix@outlook.com";
    let body = format!("name=Alphonse&email={0}&email_check={0}", email);

    Mock::given(path("v1/email"))
        .and(method("POST"))
        .respond_with(ResponseTemplate::new(200))
        .expect(1)
        .mount(&app.email_server)
        .await;

    app.post_subscriptions(body).await;
}

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

    let email = "alphonse.paix@outlook.com";
    let body = format!("name=Alphonse&email={0}&email_check={0}", email);

    Mock::given(path("v1/email"))
        .and(method("POST"))
        .respond_with(ResponseTemplate::new(200))
        .expect(1)
        .mount(&app.email_server)
        .await;

    app.post_subscriptions(body).await;

    let email_request = &app.email_server.received_requests().await.unwrap()[0];
    let confirmation_links = app.get_confirmation_links(email_request);
    assert_eq!(confirmation_links.html, confirmation_links.text);
}

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

    let email = "alphonse.paix@outlook.com";
    let body = format!("name=Alphonse&email={0}&email_check={0}", email);

    sqlx::query!("ALTER TABLE subscriptions DROP COLUMN email")
        .execute(&app.connection_pool)
        .await
        .unwrap();

    let response = app.post_subscriptions(body).await;

    assert_eq!(response.status().as_u16(), 500);
}