use std::fs;
use assert_cmd::Command;
use predicates::prelude::*;

type TestResult = Result<(), Box<dyn std::error::Error>>;

fn run(args: &[&str], expected_file: &str) -> TestResult {
    let expected = fs::read_to_string(format!("{}{}", "tests/expected/", expected_file))?;
    Command::cargo_bin("echor")?.args(args).assert().success().stdout(expected);
    Ok(())
}

#[test]
fn error_no_args() -> TestResult {
    let mut cmd = Command::cargo_bin("echor")?;
    cmd.assert()
        .failure()
        .stderr(predicate::str::contains("USAGE"));
    Ok(())
}

#[test]
fn runs() -> TestResult {
    let mut cmd = Command::cargo_bin("echor")?;
    cmd.arg("Hola").assert().success();
    Ok(())
}

#[test]
fn hello1() -> TestResult {
    run(&["Hello there"], "hello1.txt")
}

#[test]
fn hello2() -> TestResult {
    run(&["Hello", "there"], "hello2.txt")
}

#[test]
fn hello1_no_newline() -> TestResult {
    run(&["Hello  there", "-n"], "hello1.n.txt")
}

#[test]
fn hello2_no_newline() -> TestResult {
    run(&["-n", "Hello", "there"], "hello2.n.txt")
}