Added test to LazyTraceAsyncCustomizer

spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/async/LazyTraceAsyncCustomizer.java

@@ -24,6 +24,9 @@ import org.springframework.scheduling.annotation.AsyncConfigurer;
 import org.springframework.scheduling.annotation.AsyncConfigurerSupport;
 
 /**
+ * {@link AsyncConfigurerSupport} that creates a tracing data passing version
+ * of the {@link Executor}
+ *
  * @author Dave Syer
  * @since 1.0.0
  */

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/async/LazyTraceAsyncCustomizerTest.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2013-2016 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
+ *
+ *      http://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.async;
+
+import java.util.concurrent.Executor;
+
+import org.apache.commons.configuration.beanutils.BeanFactory;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.scheduling.annotation.AsyncConfigurer;
+
+import static org.assertj.core.api.BDDAssertions.then;
+
+/**
+ * @author Marcin Grzejszczak
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class LazyTraceAsyncCustomizerTest {
+
+	@Mock BeanFactory beanFactory;
+	@Mock AsyncConfigurer asyncConfigurer;
+	@InjectMocks LazyTraceAsyncCustomizer lazyTraceAsyncCustomizer;
+
+	@Test
+	public void should_wrap_async_executor_in_trace_version() throws Exception {
+		Executor executor = this.lazyTraceAsyncCustomizer.getAsyncExecutor();
+
+		then(executor).isExactlyInstanceOf(LazyTraceExecutor.class);
+	}
+}