current impl was missing testStepId; add it

- note that the tests are not catching the fact that this new field is
  missing from the expected output, because all the tests are doing an
  "included" test, rather than the correct equality; fixing this in a
  later commit

Signed-off-by: mimir-d <[email protected]>

src/output/emitter.rs

@@ -84,17 +84,17 @@ impl StdoutWriter {
 }
 
 pub struct JsonEmitter {
-    sequence_no: Arc<atomic::AtomicU64>,
     timezone: chrono_tz::Tz,
     writer: WriterType,
+    seqno: Arc<atomic::AtomicU64>,
 }
 
 impl JsonEmitter {
     pub(crate) fn new(timezone: chrono_tz::Tz, writer: WriterType) -> Self {
         JsonEmitter {
             timezone,
             writer,
-            sequence_no: Arc::new(atomic::AtomicU64::new(0)),
+            seqno: Arc::new(atomic::AtomicU64::new(0)),
         }
     }
 
@@ -110,8 +110,8 @@ impl JsonEmitter {
     }
 
     fn next_sequence_no(&self) -> u64 {
-        self.sequence_no.fetch_add(1, atomic::Ordering::SeqCst);
-        self.sequence_no.load(atomic::Ordering::SeqCst)
+        self.seqno.fetch_add(1, atomic::Ordering::SeqCst);
+        self.seqno.load(atomic::Ordering::SeqCst)
     }
 
     pub async fn emit(&self, object: &spec::RootArtifact) -> Result<(), WriterError> {