Add attendee transformation workflows

MeetingAssistant.Tests/MeetingWorkflowEngineTests.cs

@@ -310,6 +310,10 @@ public sealed class MeetingWorkflowEngineTests
     [InlineData("speaker_identified:\n        name: ADA", "speaker", null, null, "ada", true)]
     [InlineData("speaker_identified:\n        name: Ada", "speaker", null, null, "Grace", false)]
     [InlineData("speaker_identified: {}", "speaker", null, null, "Grace", true)]
+    [InlineData("attendee_added:\n        equals: Ada Lovelace", "attendee", null, null, "ada lovelace", true)]
+    [InlineData("attendee_added:\n        contains: contoso", "attendee", null, null, "Ada (Contoso)", true)]
+    [InlineData("attendee_added:\n        regex: '^Ada .+Contoso\\)$'", "attendee", null, null, "Ada (Contoso)", true)]
+    [InlineData("attendee_added:\n        regex: '^Grace'", "attendee", null, null, "Ada (Contoso)", false)]
     public async Task TriggerMatchingScenarios(
         string triggerYaml,
         string eventKind,
@@ -318,6 +322,16 @@ public sealed class MeetingWorkflowEngineTests
         string? speaker,
         bool shouldRun)
     {
+        var stepYaml = eventKind == "attendee"
+            ? """
+                - uses: set_property
+                  property: attendee.name
+                  value: Triggered
+            """
+            : """
+                - uses: add_project
+                  value: Triggered
+            """;
         var fixture = await WorkflowFixture.CreateAsync(
             $$"""
             rules:
@@ -325,14 +339,21 @@ public sealed class MeetingWorkflowEngineTests
               on:
                 - {{triggerYaml}}
               steps:
-                - uses: add_project
-                  value: Triggered
+            {{stepYaml}}
             """);
 
-        await fixture.Engine.RunAsync(
-            CreateEvent(eventKind, fixture.Artifacts, from, to, speaker),
-            fixture.Options,
-            CancellationToken.None);
+        var workflowEvent = CreateEvent(eventKind, fixture.Artifacts, from, to, speaker);
+        if (eventKind == "attendee")
+        {
+            var transformed = await fixture.Engine.TransformAttendeeAsync(
+                workflowEvent,
+                fixture.Options,
+                CancellationToken.None);
+            Assert.Equal(shouldRun ? "Triggered" : speaker, transformed);
+            return;
+        }
+
+        await fixture.Engine.RunAsync(workflowEvent, fixture.Options, CancellationToken.None);
 
         var meeting = await fixture.ReadMeetingAsync();
         Assert.Equal(shouldRun, meeting.Frontmatter.Projects.Contains("Triggered"));
@@ -603,6 +624,34 @@ public sealed class MeetingWorkflowEngineTests
         Assert.Equal(["Ada Lovelace"], meeting.Frontmatter.Attendees);
     }
 
+    [Fact]
+    public async Task AttendeeAddedRuleCanTransformWorkflowAddedAttendee()
+    {
+        var fixture = await WorkflowFixture.CreateAsync(
+            """
+            rules:
+            - name: add-raw-attendee
+              on:
+                - created: {}
+              steps:
+                - uses: add_attendee
+                  value: 'Ada Lovelace (Contoso)'
+            - name: clean-contoso-attendee
+              on:
+                - attendee_added:
+                    contains: 'Contoso'
+              steps:
+                - uses: set_property
+                  property: attendee.name
+                  value: '@Model.Attendee.Name.Replace(" (Contoso)", "")'
+            """);
+
+        await RunCreatedAsync(fixture);
+
+        var meeting = await fixture.ReadMeetingAsync();
+        Assert.Equal(["Ada Lovelace"], meeting.Frontmatter.Attendees);
+    }
+
     [Fact]
     public async Task AddAttendeeDoesNotDuplicateExistingDisplayNameFromEmailAddress()
     {
@@ -792,6 +841,7 @@ public sealed class MeetingWorkflowEngineTests
         {
             "created" => MeetingWorkflowEvent.Created(artifacts),
             "speaker" => MeetingWorkflowEvent.SpeakerIdentified(artifacts, speaker ?? "Ada"),
+            "attendee" => MeetingWorkflowEvent.AttendeeAdded(artifacts, speaker ?? "Ada"),
             "state" => MeetingWorkflowEvent.StateTransition(
                 artifacts,
                 ParseState(from ?? "collecting metadata"),