[runtime] [proxies] adding tests for uncovered branches

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index bef6dba7932e0297f3471f22b7829395c6379a24..3687821d882603cb1cf4cc0c80d2d94868ef4597 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -15074,7 +15074,7 @@ Maybe<bool> JSProxy::SetPrototype(Handle<JSProxy> proxy, Handle<Object> value,
   // throw a TypeError exception.
   if (bool_trap_result && !value->SameValue(*target_proto)) {
     isolate->Throw(*isolate->factory()->NewTypeError(
-        MessageTemplate::kProxyTrapViolatesInvariant, target));
+        MessageTemplate::kProxyTrapViolatesInvariant, trap_name));
     return Nothing<bool>();
   }
   // 13. Return booleanTrapResult.