feat: edge gateway service

gateway/internal/downstream/downstream_test.go

@@ -0,0 +1,39 @@
+package downstream
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestStaticRouterRoutesExactMessageType(t *testing.T) {
+	t.Parallel()
+
+	want := &stubClient{}
+	router := NewStaticRouter(map[string]Client{
+		"fleet.move": want,
+	})
+
+	got, err := router.Route("fleet.move")
+	require.NoError(t, err)
+	assert.Same(t, want, got)
+}
+
+func TestStaticRouterRejectsUnknownMessageType(t *testing.T) {
+	t.Parallel()
+
+	router := NewStaticRouter(map[string]Client{
+		"fleet.move": &stubClient{},
+	})
+
+	_, err := router.Route("fleet.rename")
+	require.ErrorIs(t, err, ErrRouteNotFound)
+}
+
+type stubClient struct{}
+
+func (*stubClient) ExecuteCommand(context.Context, AuthenticatedCommand) (UnaryResult, error) {
+	return UnaryResult{}, nil
+}