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package usage
import (
"testing"
"aigw/internal/domain"
)
func TestObserverReadsOpenAIJSONUsage(t *testing.T) {
observer := NewObserver(domain.ProtocolOpenAI, false)
_, _ = observer.Write([]byte(`{"choices":[],"usage":{"prompt_tokens":11,"completion_tokens":7,"total_tokens":18}}`))
got := observer.Usage()
if got.InputTokens != 11 || got.OutputTokens != 7 || got.TotalTokens != 18 {
t.Fatalf("unexpected usage: %+v", got)
}
}
func TestObserverCombinesAnthropicSSEUsage(t *testing.T) {
observer := NewObserver(domain.ProtocolAnthropic, true)
_, _ = observer.Write([]byte("event: message_start\ndata: {\"type\":\"message_start\",\"message\":{\"usage\":{\"input_tokens\":12,\"output_tokens\":1}}}\n\n"))
_, _ = observer.Write([]byte("event: message_delta\ndata: {\"type\":\"message_delta\",\"usage\":{\"output_tokens\":8}}\n\n"))
got := observer.Usage()
if got.InputTokens != 12 || got.OutputTokens != 8 || got.TotalTokens != 20 {
t.Fatalf("unexpected usage: %+v", got)
}
}
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