Simplify test environment setup to return TempDir directly

- Remove TestEnvironment struct and return TempDir from setup function
- Update tests to compute paths from temp_dir.path() on-demand
- Eliminate unused field warnings and reduce code complexity
- Maintain all test functionality with cleaner design

tests/common.rs

@@ -1,20 +1,8 @@
-use std::path::{Path, PathBuf};
+use std::path::Path;
 use tempfile::TempDir;
 
-pub struct TestEnvironment {
-    pub temp_dir: TempDir,
-    pub config_path: PathBuf,
-    pub cert_path: PathBuf,
-    pub key_path: PathBuf,
-    pub content_path: PathBuf,
-    pub port: u16,
-}
-
-pub fn setup_test_environment() -> TestEnvironment {
+pub fn setup_test_environment() -> TempDir {
     let temp_dir = TempDir::new().unwrap();
-    let config_path = temp_dir.path().join("config.toml");
-    let cert_path = temp_dir.path().join("cert.pem");
-    let key_path = temp_dir.path().join("key.pem");
     let content_path = temp_dir.path().join("content");
 
     // Create content directory and file
@@ -24,17 +12,7 @@ pub fn setup_test_environment() -> TestEnvironment {
     // Generate test certificates
     generate_test_certificates(temp_dir.path());
 
-    // Use a unique port based on process ID to avoid conflicts
-    let port = 1967 + (std::process::id() % 1000) as u16;
-
-    TestEnvironment {
-        temp_dir,
-        config_path,
-        cert_path,
-        key_path,
-        content_path,
-        port,
-    }
+    temp_dir
 }
 
 fn generate_test_certificates(temp_dir: &Path) {