cargo-grip4rust 0.3.0

A cargo subcommand for measuring Rust testability
Documentation 
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// Copyright 2026 Umberto Gotti <umberto.gotti@umbertogotti.dev>
// Licensed under the MIT License
// SPDX-License-Identifier: MIT

use std::fs;

use grip::cache::Cache;
use tempfile::TempDir;

#[test]
fn cache_hit_returns_same_counts() {
    // Arrange
    let dir = TempDir::new().unwrap();
    let src = dir.path().join("src");
    fs::create_dir_all(&src).unwrap();
    let file = src.join("lib.rs");
    fs::write(&file, "pub fn greet() -> i32 { 42 }").unwrap();

    let mut cache = Cache::new(dir.path());

    let source = fs::read_to_string(&file).unwrap();
    let (initial, _fns) = grip::collector::Collector::collect(&source, &file);
    cache.set(&file, &source, &initial);

    // Act
    let cached = cache.get(&file);

    // Assert
    assert!(cached.is_some());
    assert_eq!(cached.unwrap().total_functions, 1);
}

#[test]
fn cache_miss_after_change() {
    // Arrange
    let dir = TempDir::new().unwrap();
    let src = dir.path().join("src");
    fs::create_dir_all(&src).unwrap();
    let file = src.join("lib.rs");
    fs::write(&file, "pub fn greet() -> i32 { 42 }").unwrap();

    let mut cache = Cache::new(dir.path());
    let source = fs::read_to_string(&file).unwrap();
    let (initial, _fns) = grip::collector::Collector::collect(&source, &file);
    cache.set(&file, &source, &initial);

    fs::write(&file, "fn hidden() -> i32 { 0 }").unwrap();

    // Act
    let cached = cache.get(&file);

    // Assert
    assert!(cached.is_none());
}