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package operator_test
import (
"context"
"flux/core"
"flux/core/operator"
"testing"
)
type timestampEvent struct {
EventTime int64
}
func TestWatermarkGeneratorPreservesAssignedEventTimestamp(t *testing.T) {
ctx := context.Background()
op := operator.NewWatermarkGeneratorOperator[timestampEvent](0)
if err := op.Open(ctx); err != nil {
t.Fatalf("open operator failed: %v", err)
}
t.Cleanup(func() {
if err := op.Close(ctx); err != nil {
t.Errorf("close operator: %v", err)
}
})
out := &captureEmitter[timestampEvent]{}
input := core.NewDataRecord("user-1", timestampEvent{EventTime: 999}, 40)
if err := op.Process(ctx, input, out); err != nil {
t.Fatalf("process operator failed: %v", err)
}
records := out.Records()
if len(records) == 0 {
t.Fatal("operator emitted no records")
}
got := records[0]
if got.Type != core.RecordData {
t.Fatalf("first output type: got %v, want RecordData", got.Type)
}
if got.Key != "user-1" {
t.Errorf("data key: got %q, want %q", got.Key, "user-1")
}
if got.Value != input.Value {
t.Errorf("data value: got %+v, want %+v", got.Value, input.Value)
}
if got.Timestamp != 40 {
t.Errorf("data timestamp: got %d, want %d", got.Timestamp, 40)
}
}
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