Add object attribute test under memory pressure

src/fellow_cache.c

@@ -5977,6 +5977,11 @@ t_cache(unsigned chksum)
 		}
 		assert(fcr.status == fcr_allocerr);
 		AZ(strcmp(fcr.r.err, "objsize_max reached"));
+		for (u = 0; u < OA__MAX; u++) {
+			AN(fellow_busy_setattr(fbo, u,
+				strlen(oatest[u]), oatest[u]));
+		}
+		t_getattr(fc, fco);
 	} while (fcr.status == fcr_ok);
 
 	fellow_busy_obj_trimstore(fbo);