🧪 test: implement missing tests for SubmoduleEntry::is_remote (#42)

- Updated `test_entry_is_remote` in `src/config.rs` with additional edge cases:
    - Verifying that a protocol not at the start of the URL string returns false.
    - Verifying that a minimal protocol string (e.g., "https://") returns true.
- Added `test_config_submodule_remote_check` to `src/config.rs` to verify remote status on entries added to a `Config` struct.

Addresses the missing testing gap for `is_remote` as specified in the task.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: bashandbone

src/config.rs

@@ -1259,6 +1259,14 @@ mod tests {
 
         entry.url = None;
         assert!(!entry.is_remote());
+
+        // Protocol not at start
+        entry.url = Some("/path/to/https://repo".to_string());
+        assert!(!entry.is_remote());
+
+        // Minimal protocol
+        entry.url = Some("https://".to_string());
+        assert!(entry.is_remote());
     }
 
     #[test]
@@ -2110,4 +2118,24 @@ active = true
         let data = config.data();
         assert!(data.is_ok());
     }
+
+    #[test]
+    fn test_config_submodule_remote_check() {
+        let mut config = Config::default();
+        let entry = SubmoduleEntry::new(
+            Some("https://github.com/user/repo".to_string()),
+            Some("libs/repo".to_string()),
+            None,
+            None,
+            None,
+            None,
+            Some(true),
+            None,
+            None,
+        );
+        config.add_submodule("repo".to_string(), entry);
+
+        let retrieved = config.get_submodule("repo").expect("submodule should exist");
+        assert!(retrieved.is_remote());
+    }
 }