Testing Diesel Code


#1

I’m writing my first Diesel application, and I really want to find a better way to run tests. I’m currently doing this so it can use a different database:

pub fn establish_connection() -> PgConnection {
    dotenv().ok();

    let database_url_env_var_name = if cfg!(test) {
        "DATABASE_URL"
    } else {
        "TEST_DATABASE_URL"
    };

    let database_url = env::var(database_url_env_var_name)
        .expect(&format!("{} must be set in order to connect to the database", database_url_env_var_name));
    PgConnection::establish(&database_url)
        .expect(&format!("Error connecting to {}", database_url))
}

but I suspect there may be a better way. If so, I’d love to hear about it.

In addition, I want to enforce some postconditions on my tests (somewhat like meta testing, testing my test suite). Specifically, I want to ensure that there are no entries in any table in the database once the test suite is finished running.

How can I do this? Is it possible?