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#include "observer.h"
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#include "worker-interface.h"
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#include <kj/test.h>
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namespace workerd {
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namespace {
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KJ_TEST("FeatureObserver") {
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  FeatureObserver::init(FeatureObserver::createDefault());
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  auto& observer = KJ_ASSERT_NONNULL(FeatureObserver::get());
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  observer.use(FeatureObserver::Feature::TEST);
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  observer.use(FeatureObserver::Feature::TEST);
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  observer.use(FeatureObserver::Feature::TEST);
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  uint64_t count = 0;
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  observer.collect([&](FeatureObserver::Feature feature, const uint64_t value) {
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    KJ_ASSERT(feature == FeatureObserver::Feature::TEST);
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    count = value;
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  });
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  KJ_ASSERT(count == 3);
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}
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}  // namespace
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}  // namespace workerd