text: /*
   * Copyright (c) 2015 Uber Technologies, Inc.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  package com.uber.tchannel.tracing;
  
  import io.jaegertracing.internal.JaegerTracer;
  import io.jaegertracing.internal.reporters.InMemoryReporter;
  import io.jaegertracing.internal.samplers.ConstSampler;
  import io.opentracing.Span;
  import io.opentracing.Tracer;
  import io.opentracing.noop.NoopSpan;
  import io.opentracing.noop.NoopTracerFactory;
  import org.jetbrains.annotations.NotNull;
  import org.junit.Assert;
  
  import static org.junit.Assert.*;
  
  /**
   * Tests {@link OpenTracingContext} implementation of {@link TracingContext} interface.
   *
   * @author yegor 2018-02-13.
   */
  public class NoopTracingContextTest extends TracingContextTestBase {
      private TracingContext tracingContext;
      private Tracer tracer = new JaegerTracer.Builder("noop-tracing-context")
          .withReporter(new InMemoryReporter())
          .withSampler(new ConstSampler(true))
          .build();
  
      @Override
      protected @NotNull TracingContext tracingContext(@NotNull Tracer tracer) {
          tracingContext = new OpenTracingContext(NoopTracerFactory.create().scopeManager());
          return tracingContext;
      }
  
      @Override
      public void testTracingContextNoCurrent() {
          //NoopScopeManager always return default INSTANCE as active span
          assertTrue(tracingContext.hasSpan());
      }
  
      @Override
      public void testTracingContextCannotPop() {
          //NoopScopeManager always return default INSTANCE as active span which will be popped again and again
          assertNotNull(tracingContext.popSpan());
      }
  
      @Override
      public void testTracingContext() {
          tracingContext.clear();
          //make sure clear won't stuck in infinite loop
          Assert.assertTrue(true);
      }
  
      @Override
      public void testTracingContextThreadLocal() throws InterruptedException {
          final String[] spanId = new String[1];
          Thread thread = new Thread(new Runnable() {
              @Override
              public void run() {
                  Span span = tracer.buildSpan("test").start();
                  spanId[0] = span.context().toSpanId();
                  tracingContext.pushSpan(span);
                  assertEquals(NoopSpan.INSTANCE, tracingContext.currentSpan());
              }
          });
          thread.join();
          assertEquals(NoopSpan.INSTANCE, tracingContext.currentSpan());
      }
  }
  