pkg/subsystem: query child subsystems

Let the Service also serve the child subsystem query requests.

1 files changed, 19 insertions, 0 deletions

diff --git a/pkg/subsystem/service_test.go b/pkg/subsystem/service_test.go
new file mode 100644
index 000000000..2a95b9558
--- /dev/null
+++ b/pkg/subsystem/service_test.go
@@ -0,0 +1,19 @@
+// Copyright 2023 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+package subsystem
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestServiceChildren(t *testing.T) {
+	unrelated := &Subsystem{Name: "unrelated"}
+	parent := &Subsystem{Name: "parent"}
+	childA := &Subsystem{Name: "childA", Parents: []*Subsystem{parent}}
+	childB := &Subsystem{Name: "childB", Parents: []*Subsystem{parent}}
+	service := MustMakeService([]*Subsystem{unrelated, parent, childA, childB})
+	assert.ElementsMatch(t, service.Children(parent), []*Subsystem{childA, childB})
+}