Implement tests for handle_client functions

Added unit tests for client request handling functions.

Author: MikAoJk

tests/handle_client_tests.rs

@@ -0,0 +1,67 @@
+use rust_crud_rest_api::handle_client::{get_id, get_user_request_body, handle_post_request, handle_get_all_request, handle_put_request, handle_delete_request};
+
+#[test]
+fn test_get_id() {
+    let req = "GET /users/42 HTTP/1.1\r\nHost: localhost\r\n\r\n";
+    assert_eq!(get_id(req), "42");
+    let req = "GET /users/abc HTTP/1.1\r\n";
+    assert_eq!(get_id(req), "abc");
+    let req = "GET /users/ HTTP/1.1\r\n";
+    assert_eq!(get_id(req), "");
+}
+
+#[test]
+fn test_get_user_request_body_valid() {
+    let req = "POST /users HTTP/1.1\r\nHost: localhost\r\n\r\n{\"name\":\"Alice\",\"email\":\"[email protected]\"}";
+    let user = get_user_request_body(req).unwrap();
+    assert_eq!(user.name, "Alice");
+    assert_eq!(user.email, "[email protected]");
+    assert_eq!(user.id, None);
+}
+
+#[test]
+fn test_get_user_request_body_invalid() {
+    let req = "POST /users HTTP/1.1\r\nHost: localhost\r\n\r\nnot a json";
+    assert!(get_user_request_body(req).is_err());
+}
+
+use std::env;
+fn get_test_db_url() -> String {
+    env::var("TEST_DATABASE_URL").unwrap_or_else(|_| "postgres://postgres:password@localhost/testdb".to_string())
+}
+
+#[test]
+#[ignore]
+fn test_handle_post_and_get_all_request() {
+    let db_url = get_test_db_url();
+    
+    let req = "POST /users HTTP/1.1\r\n\r\n{\"name\":\"Bob\",\"email\":\"[email protected]\"}";
+    let (status, body) = handle_post_request(req, &db_url);
+    assert!(status.contains("200 OK"));
+    assert_eq!(body, "User created");
+
+    let (status, body) = handle_get_all_request("GET /users HTTP/1.1\r\n\r\n", &db_url);
+    assert!(status.contains("200 OK"));
+    assert!(body.contains("[email protected]"));
+}
+
+#[test]
+#[ignore]
+fn test_handle_put_and_delete_request() {
+    let db_url = get_test_db_url();
+    
+    let req = "POST /users HTTP/1.1\r\n\r\n{\"name\":\"Charlie\",\"email\":\"[email protected]\"}";
+    let _ = handle_post_request(req, &db_url);
+
+    
+    let req = "PUT /users/1 HTTP/1.1\r\n\r\n{\"name\":\"Charles\",\"email\":\"[email protected]\"}";
+    let (status, body) = handle_put_request(req, &db_url);
+    assert!(status.contains("200 OK"));
+    assert_eq!(body, "User updated");
+
+    
+    let req = "DELETE /users/1 HTTP/1.1\r\n\r\n";
+    let (status, body) = handle_delete_request(req, &db_url);
+    assert!(status.contains("200 OK"));
+    assert_eq!(body, "User deleted");
+}