// Separate test file to ensure logger file functionality is tested in isolation
// This avoids conflicts with other logger tests due to Once::call_once() limitation
use mcp_stdio_wrapper::logger::{flush_logger, init_logger};
use tracing::info;
/// Comprehensive test for log file functionality
/// Tests file creation, writing, and append mode in a single test
/// to avoid conflicts with `Once::call_once()` limitation
///
/// This test covers:
/// 1. File creation when it doesn't exist
/// 2. Append mode when file already exists
/// 3. Writing log messages to file
/// 4. Proper log formatting
#[tokio::test]
async fn test_logger_file_all_scenarios() {
// Setup: Create a temp directory and pre-populate a file to test append mode
let temp_dir = tempfile::tempdir().unwrap();
let log_file = temp_dir.path().join("comprehensive_test.log");
let log_path = log_file.to_str().unwrap();
// Pre-create file with initial content to test append mode
std::fs::write(&log_file, "=== Initial Content ===\n").unwrap();
assert!(log_file.exists(), "Pre-created log file should exist");
// Initialize logger with file path - should append, not overwrite
init_logger(Some("info"), Some(log_path));
// Log multiple messages to test writing
info!("first message");
info!("second message");
info!("third message");
// Flush to ensure all logs are written
flush_logger();
// Give a small delay to ensure file system operations complete
tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;
// Verify file still exists
assert!(log_file.exists(), "Log file should exist after logging");
// Read and verify file contents
let contents = std::fs::read_to_string(&log_file).unwrap();
// Verify append mode - initial content should be preserved
assert!(
contents.contains("=== Initial Content ==="),
"File should preserve initial content (append mode)"
);
// Verify new log messages were written
assert!(
contents.contains("first message"),
"Log file should contain 'first message'"
);
assert!(
contents.contains("second message"),
"Log file should contain 'second message'"
);
assert!(
contents.contains("third message"),
"Log file should contain 'third message'"
);
// Verify log format (should contain INFO level)
assert!(
contents.contains("INFO"),
"Log file should contain INFO level"
);
// Verify multiple lines were written
let line_count = contents.lines().count();
assert!(
line_count >= 4,
"Log file should contain at least 4 lines (1 initial + 3 logs), found {line_count}"
);
}
// Made with Bob
