diff --git a/skywalking-sniffer/pom.xml b/skywalking-sniffer/pom.xml
index 2661cf4d9..a6aef14eb 100644
--- a/skywalking-sniffer/pom.xml
+++ b/skywalking-sniffer/pom.xml
@@ -17,6 +17,7 @@
         <module>skywalking-api</module>
         <module>skywalking-sdk-plugin</module>
         <module>skywalking-toolkit-activation</module>
+        <module>skywalking-sniffer-mock</module>
     </modules>
 
     <properties>
diff --git a/skywalking-sniffer/skywalking-api/pom.xml b/skywalking-sniffer/skywalking-api/pom.xml
index e11ee28cc..5774f18bd 100644
--- a/skywalking-sniffer/skywalking-api/pom.xml
+++ b/skywalking-sniffer/skywalking-api/pom.xml
@@ -51,26 +51,6 @@
             <artifactId>disruptor</artifactId>
             <version>3.3.6</version>
         </dependency>
-
-        <!-- test dependencies section -->
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>4.11</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.powermock</groupId>
-            <artifactId>powermock-api-mockito</artifactId>
-            <version>1.6.5</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.powermock</groupId>
-            <artifactId>powermock-module-junit4</artifactId>
-            <version>1.6.5</version>
-            <scope>test</scope>
-        </dependency>
     </dependencies>
     <build>
         <plugins>
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/pom.xml b/skywalking-sniffer/skywalking-sniffer-mock/pom.xml
new file mode 100644
index 000000000..b18693f11
--- /dev/null
+++ b/skywalking-sniffer/skywalking-sniffer-mock/pom.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>skywalking-sniffer</artifactId>
+        <groupId>com.a.eye</groupId>
+        <version>3.0-2017</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>skywalking-sniffer-mock</artifactId>
+    <description>This is a sniffer mock module, test for test-dependency, only.</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.a.eye</groupId>
+            <artifactId>skywalking-api</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+
+        <!-- direct dependency junit, based on this is a mock module. -->
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+        </dependency>
+    </dependencies>
+
+
+</project>
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/context/MockTracerContextListener.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/context/MockTracerContextListener.java
new file mode 100644
index 000000000..ec7e1ccde
--- /dev/null
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/context/MockTracerContextListener.java
@@ -0,0 +1,51 @@
+package com.a.eye.skywalking.sniffer.mock.context;
+
+import com.a.eye.skywalking.api.context.TracerContext;
+import com.a.eye.skywalking.api.context.TracerContextListener;
+import com.a.eye.skywalking.trace.TraceSegment;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import org.junit.Assert;
+
+/**
+ * This is mock tracer context listener, which should be added by calling {@link TracerContext.ListenerManager#add(TracerContextListener)}.
+ * This mock listener will hold all finished trace, which all are generated by {@link TracerContext#finish()}.
+ *
+ * Created by wusheng on 2017/2/20.
+ */
+public class MockTracerContextListener implements TracerContextListener {
+    private List<TraceSegment> finishedTraceSegments = Collections.synchronizedList(new ArrayList<TraceSegment>());
+
+    @Override public void afterFinished(TraceSegment traceSegment) {
+        finishedTraceSegments.add(traceSegment);
+    }
+
+    /**
+     * Assert all finished {@link #finishedTraceSegments} match the given size.
+     *
+     * @param size the give size.
+     */
+    public void assertSize(int size){
+        Assert.assertEquals(size, finishedTraceSegments.size());
+    }
+
+    /**
+     * Assert the {@link TraceSegment} at the given index of {@link #finishedTraceSegments},
+     * and run the given {@link SegmentAssert#call(TraceSegment)} to assert.
+     *
+     * @param index the given index.
+     * @param segmentAssert the given assert.
+     */
+    public void assertTraceSegment(int index, SegmentAssert segmentAssert){
+        assertSize(index + 1);
+        segmentAssert.call(finishedTraceSegments.get(index));
+    }
+
+    /**
+     * Clear all hold data.
+     */
+    public void clear(){
+        finishedTraceSegments.clear();
+    }
+}
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/context/SegmentAssert.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/context/SegmentAssert.java
new file mode 100644
index 000000000..52a2b66d7
--- /dev/null
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/context/SegmentAssert.java
@@ -0,0 +1,13 @@
+package com.a.eye.skywalking.sniffer.mock.context;
+
+import com.a.eye.skywalking.trace.TraceSegment;
+
+/**
+ * The <code>SegmentAssert</code> interface should be implemented by any
+ * class whose instances are intended to assert a trace segment data.
+ *
+ * Created by wusheng on 2017/2/20.
+ */
+public interface SegmentAssert{
+    void call(TraceSegment finishedSegment);
+}