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package kamon.util
import kamon.Kamon
import kamon.Kamon.buildSpan
import kamon.trace.SpanContext
import org.scalatest.{Matchers, WordSpec}
import org.slf4j.MDC
class BaggageOnMDCSpec extends WordSpec with Matchers {
"the BaggageOnMDC utility" should {
"copy all baggage items and the trace ID to MDC and clear them after evaluating the supplied code" in {
val parent = new SpanContext(1, 1, 0, true, Map.empty)
Kamon.withSpan(buildSpan("propagate-mdc").asChildOf(parent).startManual().setBaggageItem("key-to-mdc", "value")) {
BaggageOnMDC.withBaggageOnMDC {
MDC.get("key-to-mdc") should be("value")
MDC.get("trace_id") should be(HexCodec.toLowerHex(1))
}
MDC.get("key-to-mdc") should be(null)
MDC.get("trace_id") should be(null)
}
}
"don't copy the trace ID to MDC if not required" in {
Kamon.withSpan(buildSpan("propagate-mdc").startManual().setBaggageItem("key-to-mdc", "value")) {
BaggageOnMDC.withBaggageOnMDC(false, {
MDC.get("key-to-mdc") should be("value")
MDC.get("trace_id") should be(null)
})
MDC.get("key-to-mdc") should be(null)
MDC.get("trace_id") should be(null)
}
}
}
}
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