Package io.opentelemetry.sdk.testing.junit4

Class OpenTelemetryRule

  • All Implemented Interfaces:
    org.junit.rules.TestRule
    public final class OpenTelemetryRule
extends org.junit.rules.ExternalResource
    A JUnit4 rule which sets up the OpenTelemetrySdk for testing, resetting state between tests. This rule cannot be used with ClassRule. 
    
 // public class CoolTest {
 //   @Rule
 //   public OpenTelemetryExtension otelTesting = OpenTelemetryExtension.create();
 //
 //   private Tracer tracer;
 //
 //   @Before
 //   public void setUp() {
 //       tracer = otelTesting.getOpenTelemetry().getTracer("test");
 //   }
 //
 //   @Test
 //   public void test() {
 //     tracer.spanBuilder("name").startSpan().end();
 //     assertThat(otelTesting.getSpans()).containsExactly(expected);
 //   }
 //  }

    • Method Detail

      • create

        public static OpenTelemetryRule create()
        Returns a OpenTelemetryRule with a default SDK initialized with an in-memory span exporter and W3C trace context propagation.

      • getOpenTelemetry

        public io.opentelemetry.api.OpenTelemetry getOpenTelemetry()
        Returns the OpenTelemetrySdk created by this extension.

      • getSpans

        public List<io.opentelemetry.sdk.trace.data.SpanData> getSpans()
        Returns all the exported SpanData so far.

      • clearSpans

        public void clearSpans()
        Clears the collected exported SpanData. Consider making your test smaller instead of manually clearing state using this method.

      • before

        protected void before()
        Overrides:
        before in class org.junit.rules.ExternalResource

      • after

        protected void after()
        Overrides:
        after in class org.junit.rules.ExternalResource