core tests

core/health/use-cases/CheckApiHealthUseCase.ts

@@ -34,15 +34,21 @@ export class CheckApiHealthUseCase {
           timestamp: result.timestamp,
         });
       } else {
+        const error = result.error || 'Unknown error';
         await eventPublisher.publishHealthCheckFailed({
-          error: result.error || 'Unknown error',
+          error,
           timestamp: result.timestamp,
         });
+        // Return result with error property
+        return {
+          ...result,
+          error,
+        };
       }
 
       return result;
     } catch (error) {
-      const errorMessage = error instanceof Error ? error.message : 'Unknown error';
+      const errorMessage = error instanceof Error ? error.message : (error ? String(error) : 'Unknown error');
       const timestamp = new Date();
 
       // Emit failed event