set timezone in test before dumping timestamp

Summary:
The tests that check the serialized result fail when they contain timestamps when run on any system that is not set to Pacific time (e.g. Fedora build systems are set to UTC).

Set the timezone we expect explicitly for the tests

Reviewed By: davide125

Differential Revision: D57490840

fbshipit-source-id: c65f2ee919772776c3436cd614877db77635f58b

below/dump/src/test.rs

@@ -1004,6 +1004,10 @@ fn test_dump_queue_content() {
         hostname: "h".to_string(),
     };
 
+    // we are dumping timestamps assuming they are local time
+    // so the timezone needs to be set to the expected TZ
+    std::env::set_var("TZ", "US/Pacific");
+
     let result = queue_dumper
         .dump_model(&ctx, &model, &mut queue_content, &mut round, false)
         .expect("Failed to dump queue model");