feat(cli): notification smtp update --transport smtp|ews

tests/ZB.MOM.WW.ScadaBridge.CLI.Tests/Commands/SmtpUpdateCommandTests.cs

@@ -6,10 +6,11 @@ namespace ZB.MOM.WW.ScadaBridge.CLI.Tests.Commands;
 
 /// <summary>
 /// Tests for the <c>scadabridge notification smtp update</c> subcommand. The command
-/// gained two optional flags — <c>--tls-mode</c> and <c>--credentials</c> — that plumb
-/// through to <see cref="UpdateSmtpConfigCommand"/>. These tests pin that the flags
-/// parse, are genuinely optional (non-breaking), and that <c>--tls-mode</c> rejects
-/// values outside the canonical {None, StartTLS, SSL} set.
+/// gained optional flags — <c>--tls-mode</c>, <c>--credentials</c> and <c>--transport</c> —
+/// that plumb through to <see cref="UpdateSmtpConfigCommand"/>. These tests pin that the
+/// flags parse, are genuinely optional (non-breaking), that <c>--tls-mode</c> rejects
+/// values outside the canonical {None, StartTLS, SSL} set, and that <c>--transport</c>
+/// rejects values outside {Smtp, Ews}.
 /// </summary>
 public class SmtpUpdateCommandTests
 {
@@ -91,6 +92,46 @@ public class SmtpUpdateCommandTests
         Assert.NotEmpty(parse.Errors);
     }
 
+    [Fact]
+    public void Update_WithTransportEws_ProducesCommandCarryingIt()
+    {
+        var parse = ParseUpdate(
+            "--id", "1", "--server", "https://mail.example.com/ews/exchange.asmx", "--port", "443",
+            "--auth-mode", "Basic", "--from-address", "noreply@example.com",
+            "--transport", "Ews");
+
+        Assert.Empty(parse.Errors);
+        var cmd = NotificationCommands.BuildUpdateSmtpConfigCommand(parse);
+
+        Assert.Equal("Ews", cmd.Transport);
+    }
+
+    [Fact]
+    public void Update_WithoutTransport_ProducesCommandWithNullTransport()
+    {
+        var parse = ParseUpdate(
+            "--id", "2", "--server", "smtp.example.com", "--port", "25",
+            "--auth-mode", "Basic", "--from-address", "noreply@example.com");
+
+        Assert.Empty(parse.Errors);
+        var cmd = NotificationCommands.BuildUpdateSmtpConfigCommand(parse);
+
+        Assert.Null(cmd.Transport);
+    }
+
+    [Theory]
+    [InlineData("Graph")]
+    [InlineData("ews")] // AcceptOnlyFromAmong is case-sensitive: constrain to canonical spelling
+    public void Update_TransportOption_RejectsValuesOutsideCanonicalSet(string value)
+    {
+        var parse = ParseUpdate(
+            "--id", "1", "--server", "smtp.example.com", "--port", "587",
+            "--auth-mode", "Basic", "--from-address", "noreply@example.com",
+            "--transport", value);
+
+        Assert.NotEmpty(parse.Errors);
+    }
+
     [Fact]
     public void Update_TlsModeAndCredentials_AreNotRequired()
     {