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package kamon.metric.instrument
import kamon.LogInterceptor
import kamon.metric.Entity
import kamon.testkit.DefaultInstrumentFactory
import org.scalatest.{Matchers, WordSpec}
import uk.org.lidalia.slf4jext.Level
import uk.org.lidalia.slf4jtest.TestLoggerFactory
class CounterSpec extends WordSpec with Matchers with LogInterceptor with DefaultInstrumentFactory {
implicit val testLogger = TestLoggerFactory.getTestLogger(classOf[LongAdderCounter])
"a Counter" should {
"allow unit and bundled increments" in {
val counter = buildCounter("unit-increments")
counter.increment()
counter.increment()
counter.increment(40)
counter.snapshot().value shouldBe(42)
}
"warn the user and ignore attempts to decrement the counter" in {
val counter = buildCounter("attempt-to-decrement")
counter.increment(100)
counter.increment(100)
counter.increment(100)
interceptLog(Level.WARN) {
counter.increment(-10L)
}.head.getMessage() shouldBe(s"Ignored attempt to decrement counter [attempt-to-decrement] on entity [$defaultEntity]")
counter.snapshot().value shouldBe(300)
}
"reset the internal state to zero after taking snapshots" in {
val counter = buildCounter("reset-after-snapshot")
counter.increment()
counter.increment(10)
counter.snapshot().value shouldBe(11)
counter.snapshot().value shouldBe(0)
}
}
}
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