test(localdb): review fixes — index assertion, AUTOINCREMENT rationale, ReadMeta guard, concurrent HLC test

2026-07-17 21:05:10 -04:00
parent 83f384247c
commit 827bf44684
3 changed files with 25 additions and 1 deletions
@@ -1,3 +1,4 @@
+using System.Collections.Concurrent;
 using ZB.MOM.WW.LocalDb.Hlc;

 namespace ZB.MOM.WW.LocalDb.Tests;
@@ -87,4 +88,20 @@ public sealed class HybridLogicalClockTests
        Assert.Equal(ms + 1, HybridLogicalClock.PhysicalMs(next));
        Assert.Equal(0, HybridLogicalClock.Counter(next));
    }
+
+    [Fact]
+    public void Next_ConcurrentCallers_NoDuplicates_StrictlyIncreasing()
+    {
+        var clock = new HybridLogicalClock();
+        var results = new ConcurrentBag<long>();
+
+        Parallel.For(0, 8, _ =>
+        {
+            for (var i = 0; i < 1000; i++)
+                results.Add(clock.Next());
+        });
+
+        Assert.Equal(8000, results.Count);
+        Assert.Equal(8000, results.Distinct().Count());
+    }
 }
@@ -54,6 +54,9 @@ public sealed class LocalDbSchemaTests : IDisposable
                     "__localdb_row_version", "__localdb_applying", "__localdb_dead_letter"
                 })
            Assert.Contains(expected, tables);
+
+        Assert.Equal(1, ScalarLong(conn,
+            "SELECT count(*) FROM sqlite_master WHERE type='index' AND name='__localdb_oplog_hlc'"));
    }

    [Fact]