test: assert stable tie-breaking under load (review)

tests/events.test.js

@@ -32,15 +32,18 @@ describe('EventQueue', () => {
     expect(q.peek()).toBeNull();
   });
 
-  it('survives a large randomized load in order', () => {
+  it('survives a large permuted load in order, stable within equal times', () => {
     const q = new EventQueue();
     const times = Array.from({ length: 500 }, (_, i) => (i * 7919) % 1000);
     for (const t of times) q.push(t, 'e', {});
-    let last = -1;
+    let last = null;
     while (q.size > 0) {
       const e = q.pop();
-      expect(e.time).toBeGreaterThanOrEqual(last);
-      last = e.time;
+      if (last) {
+        expect(e.time).toBeGreaterThanOrEqual(last.time);
+        if (e.time === last.time) expect(e.seq).toBeGreaterThan(last.seq);
+      }
+      last = e;
     }
   });
 });