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packages/system/os/tests/fs_tests.rs

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+use sal_os::fs;
+use std::fs as std_fs;
+use tempfile::TempDir;
+
+#[test]
+fn test_exist() {
+    let temp_dir = TempDir::new().unwrap();
+    let temp_path = temp_dir.path();
+
+    // Test directory exists
+    assert!(fs::exist(temp_path.to_str().unwrap()));
+
+    // Test file doesn't exist
+    let non_existent = temp_path.join("non_existent.txt");
+    assert!(!fs::exist(non_existent.to_str().unwrap()));
+
+    // Create a file and test it exists
+    let test_file = temp_path.join("test.txt");
+    std_fs::write(&test_file, "test content").unwrap();
+    assert!(fs::exist(test_file.to_str().unwrap()));
+}
+
+#[test]
+fn test_mkdir() {
+    let temp_dir = TempDir::new().unwrap();
+    let new_dir = temp_dir.path().join("new_directory");
+
+    // Directory shouldn't exist initially
+    assert!(!fs::exist(new_dir.to_str().unwrap()));
+
+    // Create directory
+    let result = fs::mkdir(new_dir.to_str().unwrap());
+    assert!(result.is_ok());
+
+    // Directory should now exist
+    assert!(fs::exist(new_dir.to_str().unwrap()));
+
+    // Creating existing directory should not error (defensive)
+    let result2 = fs::mkdir(new_dir.to_str().unwrap());
+    assert!(result2.is_ok());
+}
+
+#[test]
+fn test_file_write_and_read() {
+    let temp_dir = TempDir::new().unwrap();
+    let test_file = temp_dir.path().join("test_write.txt");
+    let content = "Hello, World!";
+
+    // Write file
+    let write_result = fs::file_write(test_file.to_str().unwrap(), content);
+    assert!(write_result.is_ok());
+
+    // File should exist
+    assert!(fs::exist(test_file.to_str().unwrap()));
+
+    // Read file
+    let read_result = fs::file_read(test_file.to_str().unwrap());
+    assert!(read_result.is_ok());
+    assert_eq!(read_result.unwrap(), content);
+}
+
+#[test]
+fn test_file_write_append() {
+    let temp_dir = TempDir::new().unwrap();
+    let test_file = temp_dir.path().join("test_append.txt");
+
+    // Write initial content
+    let initial_content = "Line 1\n";
+    let append_content = "Line 2\n";
+
+    let write_result = fs::file_write(test_file.to_str().unwrap(), initial_content);
+    assert!(write_result.is_ok());
+
+    // Append content
+    let append_result = fs::file_write_append(test_file.to_str().unwrap(), append_content);
+    assert!(append_result.is_ok());
+
+    // Read and verify
+    let read_result = fs::file_read(test_file.to_str().unwrap());
+    assert!(read_result.is_ok());
+    assert_eq!(
+        read_result.unwrap(),
+        format!("{}{}", initial_content, append_content)
+    );
+}
+
+#[test]
+fn test_file_size() {
+    let temp_dir = TempDir::new().unwrap();
+    let test_file = temp_dir.path().join("test_size.txt");
+    let content = "Hello, World!"; // 13 bytes
+
+    // Write file
+    fs::file_write(test_file.to_str().unwrap(), content).unwrap();
+
+    // Check size
+    let size_result = fs::file_size(test_file.to_str().unwrap());
+    assert!(size_result.is_ok());
+    assert_eq!(size_result.unwrap(), 13);
+}
+
+#[test]
+fn test_delete() {
+    let temp_dir = TempDir::new().unwrap();
+    let test_file = temp_dir.path().join("test_delete.txt");
+
+    // Create file
+    fs::file_write(test_file.to_str().unwrap(), "test").unwrap();
+    assert!(fs::exist(test_file.to_str().unwrap()));
+
+    // Delete file
+    let delete_result = fs::delete(test_file.to_str().unwrap());
+    assert!(delete_result.is_ok());
+
+    // File should no longer exist
+    assert!(!fs::exist(test_file.to_str().unwrap()));
+
+    // Deleting non-existent file should not error (defensive)
+    let delete_result2 = fs::delete(test_file.to_str().unwrap());
+    assert!(delete_result2.is_ok());
+}
+
+#[test]
+fn test_copy() {
+    let temp_dir = TempDir::new().unwrap();
+    let source_file = temp_dir.path().join("source.txt");
+    let dest_file = temp_dir.path().join("dest.txt");
+    let content = "Copy test content";
+
+    // Create source file
+    fs::file_write(source_file.to_str().unwrap(), content).unwrap();
+
+    // Copy file
+    let copy_result = fs::copy(source_file.to_str().unwrap(), dest_file.to_str().unwrap());
+    assert!(copy_result.is_ok());
+
+    // Destination should exist and have same content
+    assert!(fs::exist(dest_file.to_str().unwrap()));
+    let dest_content = fs::file_read(dest_file.to_str().unwrap()).unwrap();
+    assert_eq!(dest_content, content);
+}
+
+#[test]
+fn test_mv() {
+    let temp_dir = TempDir::new().unwrap();
+    let source_file = temp_dir.path().join("source_mv.txt");
+    let dest_file = temp_dir.path().join("dest_mv.txt");
+    let content = "Move test content";
+
+    // Create source file
+    fs::file_write(source_file.to_str().unwrap(), content).unwrap();
+
+    // Move file
+    let mv_result = fs::mv(source_file.to_str().unwrap(), dest_file.to_str().unwrap());
+    assert!(mv_result.is_ok());
+
+    // Source should no longer exist, destination should exist
+    assert!(!fs::exist(source_file.to_str().unwrap()));
+    assert!(fs::exist(dest_file.to_str().unwrap()));
+
+    // Destination should have same content
+    let dest_content = fs::file_read(dest_file.to_str().unwrap()).unwrap();
+    assert_eq!(dest_content, content);
+}
+
+#[test]
+fn test_which() {
+    // Test with a command that should exist on all systems
+    #[cfg(target_os = "windows")]
+    let existing_cmd = "cmd";
+    #[cfg(not(target_os = "windows"))]
+    let existing_cmd = "ls";
+
+    let result = fs::which(existing_cmd);
+    assert!(
+        !result.is_empty(),
+        "Command '{}' should exist",
+        existing_cmd
+    );
+
+    // Test with a command that shouldn't exist
+    let result = fs::which("nonexistentcommand12345");
+    assert!(result.is_empty());
+}
+
+#[test]
+fn test_find_files() {
+    let temp_dir = TempDir::new().unwrap();
+    let temp_path = temp_dir.path();
+
+    // Create test files
+    fs::file_write(&temp_path.join("test1.txt").to_string_lossy(), "content1").unwrap();
+    fs::file_write(&temp_path.join("test2.txt").to_string_lossy(), "content2").unwrap();
+    fs::file_write(
+        &temp_path.join("other.log").to_string_lossy(),
+        "log content",
+    )
+    .unwrap();
+
+    // Find .txt files
+    let txt_files = fs::find_files(temp_path.to_str().unwrap(), "*.txt");
+    assert!(txt_files.is_ok());
+    let files = txt_files.unwrap();
+    assert_eq!(files.len(), 2);
+
+    // Find all files
+    let all_files = fs::find_files(temp_path.to_str().unwrap(), "*");
+    assert!(all_files.is_ok());
+    let files = all_files.unwrap();
+    assert!(files.len() >= 3); // At least our 3 files
+}
+
+#[test]
+fn test_find_dirs() {
+    let temp_dir = TempDir::new().unwrap();
+    let temp_path = temp_dir.path();
+
+    // Create test directories
+    fs::mkdir(&temp_path.join("dir1").to_string_lossy()).unwrap();
+    fs::mkdir(&temp_path.join("dir2").to_string_lossy()).unwrap();
+    fs::mkdir(&temp_path.join("subdir").to_string_lossy()).unwrap();
+
+    // Find directories
+    let dirs = fs::find_dirs(temp_path.to_str().unwrap(), "dir*");
+    assert!(dirs.is_ok());
+    let found_dirs = dirs.unwrap();
+    assert!(found_dirs.len() >= 2); // At least dir1 and dir2
+}