Adding portion to test service user refresh token

tests/tests.rs

@@ -198,7 +198,12 @@ mod util {
     {
         match axum::body::to_bytes(response.into_body(), usize::MAX).await {
             Ok(body) => {
-                let resp: T = serde_json::from_slice(&body).unwrap();
+                let resp: T = match serde_json::from_slice(&body) {
+                    Ok(val) => val,
+                    Err(err) => {
+                        return Err(std::io::Error::other(err.to_string()));
+                    }
+                };
                 Ok(resp)
             }
             Err(err) => Err(std::io::Error::other(err.to_string())),
@@ -619,6 +624,46 @@ async fn test_refresh_token() {
         }
     }
 
+    match flow::register_service_user(&app).await {
+        Ok(user) => {
+            assert_eq!(
+                false,
+                user.id.is_nil(),
+                "The service user id should not be nil"
+            );
+            match flow::login_service_user(&app, TEST_SERVICE_USERNAME, TEST_SERVICE_PASSPHRASE)
+                .await
+            {
+                Ok(login_result) => {
+                    assert_eq!(
+                        false,
+                        login_result.access_token.is_empty(),
+                        "Access token is empty when it should not be"
+                    );
+
+                    match flow::refresh_token(&app, &login_result.access_token).await {
+                        Ok(refresh_login_result) => {
+                            assert_eq!(
+                                false,
+                                refresh_login_result.access_token.is_empty(),
+                                "Refreshed access token should not be empty"
+                            );
+                        }
+                        Err(err) => {
+                            assert!(false, "Error: {err:?}");
+                        }
+                    }
+                }
+                Err(err) => {
+                    assert!(false, "Error: {err:?}");
+                }
+            }
+        }
+        Err(err) => {
+            assert!(false, "Error: {err:?}");
+        }
+    }
+
     match db_mgr::drop_database(&tm_pool, &db_name).await {
         Ok(()) => {}
         Err(err) => {