use assert_cmd::prelude::*;
use assert_fs::prelude::*;
use predicates::prelude::*;
use std::process::Command;

#[test]
fn file_doesnt_exist() -> Result<(), Box<dyn std::error::Error>> {
    let mut cmd = Command::cargo_bin("minigrep")?;

    cmd.arg("hello").arg("test/file/doesnt/exist");

    cmd.assert()
        .failure()
        .stderr(predicate::str::contains("could not read file"));

    Ok(())
}

#[test]
fn find_content_in_file() -> Result<(), Box<dyn std::error::Error>> {
    let file = assert_fs::NamedTempFile::new("sample.txt")?;
    let content = "A test\nActual content\nMore content\nAnother test";
    file.write_str(content)?;

    Command::cargo_bin("minigrep")?
        .arg("test")
        .arg(file.path())
        .assert()
        .success()
        .stdout(predicate::str::contains("test\nAnother test"));

    Command::cargo_bin("minigrep")?
        .arg("")
        .arg(file.path())
        .assert()
        .success()
        .stdout(predicate::str::contains(content));

    Ok(())
}