missive 0.7.0

Compose, deliver, preview, and test emails in Rust - pluggable providers with zero configuration code
Documentation 
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//! Error type behavior tests.

use missive::{Attachment, MailError};
use serde_json::Value;
use std::error::Error as StdError;
use std::fs;

#[test]
fn json_errors_preserve_source_chain() {
    let serde_error = serde_json::from_str::<Value>("{").unwrap_err();
    let error = MailError::from(serde_error);

    let source = StdError::source(&error).expect("json source should be preserved");
    assert!(source.is::<serde_json::Error>());
}

#[test]
fn attachment_read_errors_preserve_io_source_chain() {
    let path = std::env::temp_dir().join(format!(
        "missive-unreadable-attachment-dir-{}",
        std::process::id()
    ));
    let _ = fs::remove_dir_all(&path);
    fs::create_dir(&path).unwrap();

    let error = Attachment::from_path(&path).unwrap_err();
    fs::remove_dir(&path).unwrap();

    let source = StdError::source(&error).expect("io source should be preserved");
    assert!(source.is::<std::io::Error>());
}

#[test]
fn mail_error_display_messages_start_lowercase() {
    assert_eq!(
        MailError::NotConfigured.to_string(),
        "email provider not configured"
    );
    assert_eq!(
        MailError::Configuration("SMTP_HOST not set".into()).to_string(),
        "configuration error: SMTP_HOST not set"
    );
    assert_eq!(
        MailError::provider("jmap", "invalidArguments").to_string(),
        "provider error (jmap): invalidArguments"
    );
}