Adds first unit test for HttpClientBeanPostProcessor (#1580)

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/HttpClientBeanPostProcessorTest.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2013-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.sleuth.instrument.web.client;
+
+import brave.propagation.TraceContext;
+import io.netty.bootstrap.Bootstrap;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import reactor.core.publisher.Mono;
+import reactor.netty.Connection;
+
+import org.springframework.cloud.sleuth.instrument.web.client.HttpClientBeanPostProcessor.PendingSpan;
+import org.springframework.cloud.sleuth.instrument.web.client.HttpClientBeanPostProcessor.TracingMapConnect;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@ExtendWith(MockitoExtension.class)
+public class HttpClientBeanPostProcessorTest {
+
+	@Mock
+	Connection connection;
+
+	@Mock
+	Bootstrap bootstrap;
+
+	TraceContext traceContext = TraceContext.newBuilder().traceId(1).spanId(2)
+			.sampled(true).build();
+
+	@Test
+	void mapConnect_should_setup_reactor_context_currentTraceContext() {
+		TracingMapConnect tracingMapConnect = new TracingMapConnect(() -> traceContext);
+
+		Mono<Connection> original = Mono.just(connection).handle((t, ctx) -> {
+			assertThat(ctx.currentContext().get(TraceContext.class))
+					.isSameAs(traceContext);
+			assertThat(ctx.currentContext().get(PendingSpan.class)).isNotNull();
+		});
+
+		// Wrap and run the assertions
+		tracingMapConnect.apply(original, bootstrap).log().subscribe();
+	}
+
+	@Test
+	void mapConnect_should_setup_reactor_context_no_currentTraceContext() {
+		TracingMapConnect tracingMapConnect = new TracingMapConnect(() -> null);
+
+		Mono<Connection> original = Mono.just(connection).handle((t, ctx) -> {
+			assertThat(ctx.currentContext().getOrEmpty(TraceContext.class)).isEmpty();
+			assertThat(ctx.currentContext().get(PendingSpan.class)).isNotNull();
+		});
+
+		// Wrap and run the assertions
+		tracingMapConnect.apply(original, bootstrap).log().subscribe();
+	}
+
+}

tests/spring-cloud-sleuth-instrumentation-mvc-tests/src/test/java/org/springframework/cloud/sleuth/instrument/web/TraceFilterWebIntegrationTests.java

@@ -58,11 +58,12 @@ import static org.assertj.core.api.BDDAssertions.then;
 /**
  * @author Marcin Grzejszczak
  */
-@ExtendWith({SpringExtension.class, OutputCaptureExtension.class})
+@ExtendWith({ SpringExtension.class, OutputCaptureExtension.class })
 @SpringBootTest(classes = TraceFilterWebIntegrationTests.Config.class,
 		webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT,
 		properties = "spring.sleuth.http.legacy.enabled=true")
 public class TraceFilterWebIntegrationTests {
+
 	@Autowired
 	BlockingQueueSpanReporter reporter;