google · wolo-lab · Sep 11, 2026 · Apr 12, 2026 · Jun 28, 2026 · Sep 11, 2026
diff --git a/server/adkrest/internal/models/event_actions_test.go b/server/adkrest/internal/models/event_actions_test.go
@@ -0,0 +1,194 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package models
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"google.golang.org/genai"
+
+	"google.golang.org/adk/v2/model"
+	"google.golang.org/adk/v2/session"
+)
+
+// TestFromSessionEvent_EventActions verifies that the mapped EventActions fields —
+// including TransferToAgent, Escalate, and SkipSummarization — are correctly
+// mapped when converting a session.Event to a REST API Event.
+//
+// Regression test for https://github.com/google/adk-go/issues/509.
+func TestFromSessionEvent_EventActions(t *testing.T) {
+	tests := []struct {
+		name    string
+		actions session.EventActions
+		want    EventActions
+	}{
+		{
+			name: "all fields populated",
+			actions: session.EventActions{
+				StateDelta:        map[string]any{"key": "value"},
+				ArtifactDelta:     map[string]int64{"file.txt": 2},
+				TransferToAgent:   "agent-b",
+				Escalate:          true,
+				SkipSummarization: true,
+			},
+			want: EventActions{
+				StateDelta:        map[string]any{"key": "value"},
+				ArtifactDelta:     map[string]int64{"file.txt": 2},
+				TransferToAgent:   "agent-b",
+				Escalate:          true,
+				SkipSummarization: true,
+			},
+		},
+		{
+			name: "TransferToAgent only",
+			actions: session.EventActions{
+				TransferToAgent: "orchestrator",
+			},
+			want: EventActions{
+				TransferToAgent: "orchestrator",
+			},
+		},
+		{
+			name: "Escalate only",
+			actions: session.EventActions{
+				Escalate: true,
+			},
+			want: EventActions{
+				Escalate: true,
+			},
+		},
+		{
+			name: "SkipSummarization only",
+			actions: session.EventActions{
+				SkipSummarization: true,
+			},
+			want: EventActions{
+				SkipSummarization: true,
+			},
+		},
+		{
+			name:    "zero value",
+			actions: session.EventActions{},
+			want:    EventActions{},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			src := session.Event{Actions: tc.actions}
+			got := FromSessionEvent(src)
+			if diff := cmp.Diff(tc.want, got.Actions); diff != "" {
+				t.Errorf("FromSessionEvent().Actions mismatch (-want +got):\n%s", diff)
+			}
+		})
+	}
+}
+
+// TestToSessionEvent_EventActions verifies the reverse mapping: REST API Event
+// back to session.Event, covering all three orchestration fields.
+func TestToSessionEvent_EventActions(t *testing.T) {
+	tests := []struct {
+		name    string
+		actions EventActions
+		want    session.EventActions
+	}{
+		{
+			name: "all fields populated",
+			actions: EventActions{
+				StateDelta:        map[string]any{"k": 1},
+				ArtifactDelta:     map[string]int64{"img.png": 3},
+				TransferToAgent:   "sub-agent",
+				Escalate:          true,
+				SkipSummarization: true,
+			},
+			want: session.EventActions{
+				StateDelta:        map[string]any{"k": 1},
+				ArtifactDelta:     map[string]int64{"img.png": 3},
+				TransferToAgent:   "sub-agent",
+				Escalate:          true,
+				SkipSummarization: true,
+			},
+		},
+		{
+			name: "TransferToAgent only",
+			actions: EventActions{
+				TransferToAgent: "root-agent",
+			},
+			want: session.EventActions{
+				TransferToAgent: "root-agent",
+			},
+		},
+		{
+			name: "Escalate only",
+			actions: EventActions{
+				Escalate: true,
+			},
+			want: session.EventActions{
+				Escalate: true,
+			},
+		},
+		{
+			name: "SkipSummarization only",
+			actions: EventActions{
+				SkipSummarization: true,
+			},
+			want: session.EventActions{
+				SkipSummarization: true,
+			},
+		},
+		{
+			name:    "zero value",
+			actions: EventActions{},
+			want:    session.EventActions{},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			src := Event{Actions: tc.actions}
+			got := ToSessionEvent(src)
+			if diff := cmp.Diff(tc.want, got.Actions); diff != "" {
+				t.Errorf("ToSessionEvent().Actions mismatch (-want +got):\n%s", diff)
+			}
+		})
+	}
+}
+
+// TestFromSessionEvent_RoundTrip verifies that a session.Event round-trips
+// through FromSessionEvent → ToSessionEvent without losing any mapped EventActions fields.
+func TestFromSessionEvent_RoundTrip(t *testing.T) {
+	original := session.Event{
+		ID:           "evt-1",
+		InvocationID: "inv-1",
+		Author:       "agent",
+		LLMResponse: model.LLMResponse{
+			Content: genai.NewContentFromText("hello", genai.RoleModel),
+		},
+		Actions: session.EventActions{
+			StateDelta:        map[string]any{"step": "done"},
+			ArtifactDelta:     map[string]int64{"report.pdf": 1},
+			TransferToAgent:   "handoff-agent",
+			Escalate:          true,
+			SkipSummarization: true,
+		},
+	}
+
+	got := ToSessionEvent(FromSessionEvent(original))
+
+	if diff := cmp.Diff(original.Actions, got.Actions); diff != "" {
+		t.Errorf("round-trip EventActions mismatch (-want +got):\n%s", diff)
+	}
+}