refquiem 0.1.0

//! The `cargo refquiem` command line: report text and exit codes.

mod common;

use common::Repo;
use std::process::{Command, Output};

fn cargo_refquiem(dir: &std::path::Path, args: &[&str]) -> Output {
    Command::new(env!("CARGO_BIN_EXE_cargo-refquiem"))
        .arg("refquiem")
        .args(args)
        .current_dir(dir)
        .env_remove("CARGO_TARGET_DIR")
        .env("GIT_CONFIG_GLOBAL", "/dev/null")
        .env("GIT_CONFIG_SYSTEM", "/dev/null")
        .output()
        .unwrap()
}

#[test]
fn findings_print_one_group_per_removed_name_and_exit_1() {
    let repo = Repo::new();
    repo.write("src/lib.rs", "pub fn gone() {}\npub fn kept() {}\n");
    repo.commit("start");
    repo.write("src/lib.rs", "// Was `crate::gone`.\npub fn kept() {}\n");
    let deleting = repo.commit("drop gone");
    repo.write("README.md", "Call `fixture::gone`.\n");

    let output = cargo_refquiem(repo.path(), &[]);

    assert_eq!(output.status.code(), Some(1));
    assert_eq!(
        String::from_utf8(output.stdout).unwrap(),
        format!(
            "refquiem: 1 removed name still mentioned, 2 mentions\n\n`fixture::gone` (function), deleted in {}\n  README.md:1:7  Markdown code span\n  src/lib.rs:1:9  comment\n",
            &deleting[..7]
        )
    );
}

#[test]
fn a_clean_scan_exits_0() {
    let repo = Repo::new();
    repo.write("src/lib.rs", "pub fn kept() {}\n");
    repo.commit("start");

    let output = cargo_refquiem(repo.path(), &[]);

    assert_eq!(output.status.code(), Some(0));
    assert_eq!(
        String::from_utf8(output.stdout).unwrap(),
        "refquiem: no stale mentions\n"
    );
}

#[test]
fn a_base_and_head_range_is_accepted_from_the_command_line() {
    let repo = Repo::new();
    repo.write("src/lib.rs", "pub fn early() {}\npub fn late() {}\n");
    repo.commit("both");
    repo.write("src/lib.rs", "pub fn late() {}\n");
    let base = repo.commit("drop early");
    repo.write("src/lib.rs", "");
    repo.write("README.md", "`fixture::early` and `fixture::late`.\n");
    let head = repo.commit("drop late");

    let output = cargo_refquiem(repo.path(), &["--base", &base, "--head", &head]);

    assert_eq!(output.status.code(), Some(1));
    let stdout = String::from_utf8(output.stdout).unwrap();
    assert!(stdout.contains("`fixture::late`"), "{stdout}");
    assert!(!stdout.contains("`fixture::early`"), "{stdout}");
}

#[test]
fn outside_a_git_repository_the_scan_fails_with_exit_2() {
    let dir = tempfile::tempdir().unwrap();

    let output = cargo_refquiem(dir.path(), &[]);

    assert_eq!(output.status.code(), Some(2));
    assert!(
        String::from_utf8(output.stderr)
            .unwrap()
            .starts_with("refquiem: ")
    );
}

#[test]
fn a_scan_failure_prints_the_full_error_chain() {
    let dir = tempfile::tempdir().unwrap();
    let status = Command::new("git")
        .args(["init", "-q", "-b", "main"])
        .current_dir(dir.path())
        .env("GIT_CONFIG_GLOBAL", "/dev/null")
        .env("GIT_CONFIG_SYSTEM", "/dev/null")
        .status()
        .unwrap();
    assert!(status.success());

    let output = cargo_refquiem(dir.path(), &[]);

    let path = std::fs::canonicalize(dir.path()).unwrap();
    assert_eq!(output.status.code(), Some(2));
    assert_eq!(
        String::from_utf8(output.stderr).unwrap(),
        format!("refquiem: no Cargo.toml at or above {}\n", path.display())
    );
}

#[test]
fn the_config_and_package_flags_reach_the_scan() {
    let repo = Repo::new();
    repo.write("src/lib.rs", "pub fn gone() {}\n");
    repo.commit("start");
    repo.write("src/lib.rs", "");
    repo.write("README.md", "`fixture::gone`\n");
    repo.write("quiet.toml", "allow = [\"gone\"]\n");

    let output = cargo_refquiem(repo.path(), &["--config", "quiet.toml"]);
    assert_eq!(output.status.code(), Some(0));

    let output = cargo_refquiem(repo.path(), &["--package", "fixture"]);
    assert_eq!(output.status.code(), Some(1));

    let output = cargo_refquiem(repo.path(), &["--package", "missing"]);
    assert_eq!(output.status.code(), Some(2));
}

#[test]
fn since_scans_only_the_commits_after_a_revision() {
    let repo = Repo::new();
    repo.write("src/lib.rs", "pub fn gone() {}\n");
    repo.commit("start");
    repo.write("src/lib.rs", "");
    repo.write("README.md", "`fixture::gone`\n");
    repo.commit("drop gone");

    let output = cargo_refquiem(repo.path(), &["--since", "HEAD~1"]);
    assert_eq!(output.status.code(), Some(1));
    let output = cargo_refquiem(repo.path(), &["--since", "HEAD"]);
    assert_eq!(output.status.code(), Some(0));
}

#[test]
fn the_cache_lives_under_cargo_target_dir_when_it_is_set() {
    let repo = Repo::new();
    repo.write("src/lib.rs", "pub fn kept() {}\n");
    repo.commit("start");
    let target = tempfile::tempdir().unwrap();

    let output = Command::new(env!("CARGO_BIN_EXE_cargo-refquiem"))
        .arg("refquiem")
        .current_dir(repo.path())
        .env("CARGO_TARGET_DIR", target.path())
        .env("GIT_CONFIG_GLOBAL", "/dev/null")
        .env("GIT_CONFIG_SYSTEM", "/dev/null")
        .output()
        .unwrap();
    assert_eq!(output.status.code(), Some(0));
    let cached = std::fs::read_dir(target.path().join("refquiem"))
        .unwrap()
        .count();
    assert!(cached > 0);
    assert!(!repo.path().join("target/refquiem").exists());
}