diff --git a/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/web/client/feign/TraceFeignClientAutoConfiguration.java b/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/web/client/feign/TraceFeignClientAutoConfiguration.java
index a82a15609..c3829f2b2 100644
--- a/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/web/client/feign/TraceFeignClientAutoConfiguration.java
+++ b/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/web/client/feign/TraceFeignClientAutoConfiguration.java
@@ -27,7 +27,6 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
-import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.cloud.openfeign.FeignAutoConfiguration;
 import org.springframework.cloud.openfeign.FeignContext;
 import org.springframework.cloud.sleuth.instrument.hystrix.SleuthHystrixAutoConfiguration;
diff --git a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/annotation/SleuthSpanCreatorAspectTests.java b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/annotation/SleuthSpanCreatorAspectTests.java
index 991880bcd..22cb0ecf7 100644
--- a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/annotation/SleuthSpanCreatorAspectTests.java
+++ b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/annotation/SleuthSpanCreatorAspectTests.java
@@ -22,7 +22,6 @@ import java.util.stream.Collectors;
 
 import brave.Span;
 import brave.Tracer;
-import brave.Tracing;
 import brave.sampler.Sampler;
 import zipkin2.Annotation;
 import zipkin2.reporter.Reporter;
diff --git a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/async/issues/issue410/Issue410Tests.java b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/async/issues/issue410/Issue410Tests.java
index a321b56b6..2642144c7 100644
--- a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/async/issues/issue410/Issue410Tests.java
+++ b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/async/issues/issue410/Issue410Tests.java
@@ -24,7 +24,6 @@ import java.util.concurrent.atomic.AtomicReference;
 
 import brave.Span;
 import brave.Tracer;
-import brave.Tracing;
 import brave.sampler.Sampler;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
diff --git a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/messaging/MessageHeaderPropagationTest.java b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/messaging/MessageHeaderPropagationTest.java
index 789576179..0f212a33e 100644
--- a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/messaging/MessageHeaderPropagationTest.java
+++ b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/messaging/MessageHeaderPropagationTest.java
@@ -19,11 +19,9 @@ package org.springframework.cloud.sleuth.instrument.messaging;
 import java.util.Collections;
 
 import brave.propagation.Propagation;
-import org.junit.Assert;
 import org.junit.Test;
 import org.springframework.messaging.support.MessageHeaderAccessor;
 
-import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.Assert.*;
 
 public class MessageHeaderPropagationTest
diff --git a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/TraceAsyncIntegrationTests.java b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/TraceAsyncIntegrationTests.java
index df8b779dd..876fcbf6a 100644
--- a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/TraceAsyncIntegrationTests.java
+++ b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/TraceAsyncIntegrationTests.java
@@ -21,7 +21,6 @@ import java.util.concurrent.atomic.AtomicReference;
 
 import brave.Span;
 import brave.Tracer;
-import brave.Tracing;
 import brave.sampler.Sampler;
 import org.awaitility.Awaitility;
 import org.junit.After;
diff --git a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/MultipleAsyncRestTemplateTests.java b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/MultipleAsyncRestTemplateTests.java
index 8966dc8a9..54d1429b2 100644
--- a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/MultipleAsyncRestTemplateTests.java
+++ b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/MultipleAsyncRestTemplateTests.java
@@ -24,7 +24,6 @@ import java.util.concurrent.atomic.AtomicBoolean;
 
 import brave.Span;
 import brave.Tracer;
-import brave.Tracing;
 import brave.sampler.Sampler;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
diff --git a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/discoveryexception/WebClientDiscoveryExceptionTests.java b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/discoveryexception/WebClientDiscoveryExceptionTests.java
index 008902ef8..7126b3ad0 100644
--- a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/discoveryexception/WebClientDiscoveryExceptionTests.java
+++ b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/discoveryexception/WebClientDiscoveryExceptionTests.java
@@ -22,7 +22,6 @@ import java.util.Map;
 
 import brave.Span;
 import brave.Tracer;
-import brave.Tracing;
 import brave.sampler.Sampler;
 import zipkin2.reporter.Reporter;
 import org.assertj.core.api.Assertions;
diff --git a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/integration/WebClientTests.java b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/integration/WebClientTests.java
index 32a878c5f..3cb6d4141 100644
--- a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/integration/WebClientTests.java
+++ b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/integration/WebClientTests.java
@@ -47,7 +47,6 @@ import org.apache.http.impl.client.BasicResponseHandler;
 import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.http.impl.nio.client.CloseableHttpAsyncClient;
 import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
-import org.assertj.core.api.BDDAssertions;
 import org.awaitility.Awaitility;
 import org.junit.After;
 import org.junit.BeforeClass;