feat(audit): AddZbAudit DI extension with safe defaults

TryAdd registers NullAuditRedactor + NoOpAuditWriter so consumer registrations win; symmetric override tests for both writer and redactor.
2026-06-01 07:32:42 -04:00
parent 453ec7358d
commit 7f05107c1d
2 changed files with 53 additions and 0 deletions
@@ -0,0 +1,32 @@
+using Microsoft.Extensions.DependencyInjection;
+
+namespace ZB.MOM.WW.Audit.Tests;
+
+public class AuditServiceCollectionExtensionsTests
+{
+    [Fact]
+    public void Registers_null_redactor_and_noop_writer_by_default()
+    {
+        var sp = new ServiceCollection().AddZbAudit().BuildServiceProvider();
+        Assert.IsType<NullAuditRedactor>(sp.GetRequiredService<IAuditRedactor>());
+        Assert.IsType<NoOpAuditWriter>(sp.GetRequiredService<IAuditWriter>());
+    }
+
+    [Fact]
+    public void Does_not_override_a_preregistered_writer()
+    {
+        var services = new ServiceCollection();
+        services.AddSingleton<IAuditWriter>(new CompositeAuditWriter(System.Array.Empty<IAuditWriter>()));
+        var sp = services.AddZbAudit().BuildServiceProvider();
+        Assert.IsType<CompositeAuditWriter>(sp.GetRequiredService<IAuditWriter>());
+    }
+
+    [Fact]
+    public void Does_not_override_a_preregistered_redactor()
+    {
+        var services = new ServiceCollection();
+        services.AddSingleton<IAuditRedactor>(new TruncatingAuditRedactor());
+        var sp = services.AddZbAudit().BuildServiceProvider();
+        Assert.IsType<TruncatingAuditRedactor>(sp.GetRequiredService<IAuditRedactor>());
+    }
+}