blazehash 0.2.5

Forensic file hasher — hashdeep for the modern era, BLAKE3 by default
Documentation 
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use assert_cmd::Command;
use std::io::Write;
use tempfile::TempDir;

fn make_manifest(dir: &TempDir) -> std::path::PathBuf {
    let path = dir.path().join("manifest.txt");
    let mut f = std::fs::File::create(&path).unwrap();
    writeln!(f, "## case: first occurrence test").unwrap();
    writeln!(f, "sha256  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa  file1.txt").unwrap();
    writeln!(f, "sha256  bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb  file2.txt").unwrap();
    writeln!(f, "sha256  cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc  file1.txt").unwrap();
    path
}

#[test]
fn test_first_keeps_first_occurrence() {
    let dir = TempDir::new().unwrap();
    let manifest = make_manifest(&dir);

    let output = Command::cargo_bin("blazehash")
        .unwrap()
        .args(["first", manifest.to_str().unwrap()])
        .output()
        .unwrap();

    assert!(output.status.success(), "command failed: {:?}", output);
    let stdout = String::from_utf8_lossy(&output.stdout);
    // First occurrence of file1.txt should have hash 'aaa...'
    assert!(stdout.contains("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa  file1.txt"),
        "expected first hash for file1.txt in output:\n{stdout}");
    // Second occurrence (ccc...) should NOT appear
    assert!(!stdout.contains("cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc"),
        "duplicate hash for file1.txt should be dropped:\n{stdout}");
}

#[test]
fn test_first_unique_paths_unaffected() {
    let dir = TempDir::new().unwrap();
    let manifest = make_manifest(&dir);

    let output = Command::cargo_bin("blazehash")
        .unwrap()
        .args(["first", manifest.to_str().unwrap()])
        .output()
        .unwrap();

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    // file2.txt appears once and should still be in output
    assert!(stdout.contains("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb  file2.txt"),
        "file2.txt should remain in output:\n{stdout}");
}

#[test]
fn test_first_preserves_headers() {
    let dir = TempDir::new().unwrap();
    let manifest = make_manifest(&dir);

    let output = Command::cargo_bin("blazehash")
        .unwrap()
        .args(["first", manifest.to_str().unwrap()])
        .output()
        .unwrap();

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(stdout.contains("## case: first occurrence test"),
        "header line should be preserved:\n{stdout}");
}

#[test]
fn test_first_missing_manifest_fails() {
    let dir = TempDir::new().unwrap();
    let missing = dir.path().join("nonexistent.txt");

    let output = Command::cargo_bin("blazehash")
        .unwrap()
        .args(["first", missing.to_str().unwrap()])
        .output()
        .unwrap();

    assert!(!output.status.success(), "should fail on missing manifest");
}

#[test]
fn test_first_output_to_file() {
    let dir = TempDir::new().unwrap();
    let manifest = make_manifest(&dir);
    let out_path = dir.path().join("out.txt");

    let output = Command::cargo_bin("blazehash")
        .unwrap()
        .args(["first", manifest.to_str().unwrap(), "-o", out_path.to_str().unwrap()])
        .output()
        .unwrap();

    assert!(output.status.success());
    let content = std::fs::read_to_string(&out_path).unwrap();

    // Count occurrences of file1.txt — should be exactly 1
    let count = content.lines()
        .filter(|l| l.contains("file1.txt"))
        .count();
    assert_eq!(count, 1, "file1.txt should appear exactly once in output:\n{content}");
}