diff --git a/demo/java-demo/src/test/java/com/alibaba/testable/demo/service/DemoMatcherServiceTest.java b/demo/java-demo/src/test/java/com/alibaba/testable/demo/service/DemoMatcherServiceTest.java
index 7aa6938..9c5a5e0 100644
--- a/demo/java-demo/src/test/java/com/alibaba/testable/demo/service/DemoMatcherServiceTest.java
+++ b/demo/java-demo/src/test/java/com/alibaba/testable/demo/service/DemoMatcherServiceTest.java
@@ -5,8 +5,7 @@ import com.alibaba.testable.demo.model.BlackBox;
 import org.junit.jupiter.api.Test;
 
 import static com.alibaba.testable.core.matcher.InvokeMatcher.*;
-import static com.alibaba.testable.core.tool.TestableTool.*;
-
+import static com.alibaba.testable.core.matcher.InvokeVerifier.verify;
 
 class DemoMatcherServiceTest {
 
diff --git a/demo/java-demo/src/test/java/com/alibaba/testable/demo/service/DemoMockServiceTest.java b/demo/java-demo/src/test/java/com/alibaba/testable/demo/service/DemoMockServiceTest.java
index e2eb215..431338b 100644
--- a/demo/java-demo/src/test/java/com/alibaba/testable/demo/service/DemoMockServiceTest.java
+++ b/demo/java-demo/src/test/java/com/alibaba/testable/demo/service/DemoMockServiceTest.java
@@ -7,6 +7,7 @@ import org.junit.jupiter.api.Test;
 
 import java.util.concurrent.Executors;
 
+import static com.alibaba.testable.core.matcher.InvokeVerifier.verify;
 import static com.alibaba.testable.core.tool.TestableTool.*;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
diff --git a/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/service/DemoMockServiceTest.kt b/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/service/DemoMockServiceTest.kt
index 9e9d0d6..936684c 100644
--- a/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/service/DemoMockServiceTest.kt
+++ b/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/service/DemoMockServiceTest.kt
@@ -1,6 +1,7 @@
 package com.alibaba.testable.demo.service
 
 import com.alibaba.testable.core.annotation.TestableMock
+import com.alibaba.testable.core.matcher.InvokeVerifier.verify
 import com.alibaba.testable.core.tool.TestableTool.*
 import com.alibaba.testable.demo.model.BlackBox
 import com.alibaba.testable.demo.model.Box
@@ -9,7 +10,6 @@ import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
 import java.util.concurrent.Executors
 
-
 internal class DemoMockServiceTest {
 
     @TestableMock(targetMethod = CONSTRUCTOR)
diff --git a/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/util/PathUtilTest.kt b/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/util/PathUtilTest.kt
index 85c2310..1553d11 100644
--- a/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/util/PathUtilTest.kt
+++ b/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/util/PathUtilTest.kt
@@ -1,8 +1,8 @@
 package com.alibaba.testable.demo.util
 
-import org.junit.jupiter.api.Test
 import com.alibaba.testable.core.annotation.TestableMock
-import com.alibaba.testable.core.tool.TestableTool.verify
+import com.alibaba.testable.core.matcher.InvokeVerifier.verify
+import org.junit.jupiter.api.Test
 import java.io.File
 
 class PathUtilTest {
diff --git a/testable-core/src/main/java/com/alibaba/testable/core/matcher/InvokeVerifier.java b/testable-core/src/main/java/com/alibaba/testable/core/matcher/InvokeVerifier.java
index c044ef7..e03ae15 100644
--- a/testable-core/src/main/java/com/alibaba/testable/core/matcher/InvokeVerifier.java
+++ b/testable-core/src/main/java/com/alibaba/testable/core/matcher/InvokeVerifier.java
@@ -2,6 +2,7 @@ package com.alibaba.testable.core.matcher;
 
 import com.alibaba.testable.core.error.VerifyFailedError;
 import com.alibaba.testable.core.model.Verification;
+import com.alibaba.testable.core.util.InvokeRecordUtil;
 import com.alibaba.testable.core.util.TestableUtil;
 
 import java.security.InvalidParameterException;
@@ -15,10 +16,20 @@ public class InvokeVerifier {
     private final List<Object[]> records;
     private Verification lastVerification = null;
 
-    public InvokeVerifier(List<Object[]> records) {
+    private InvokeVerifier(List<Object[]> records) {
         this.records = records;
     }
 
+    /**
+     * Get counter to check whether specified mock method invoked
+     * @param mockMethodName name of a mock method
+     */
+    public static InvokeVerifier verify(String mockMethodName) {
+        String testClass = Thread.currentThread().getStackTrace()[InvokeRecordUtil.INDEX_OF_TEST_CLASS].getClassName();
+        String testCaseName = TestableUtil.currentTestCaseName(testClass);
+        return new InvokeVerifier(InvokeRecordUtil.getInvokeRecord(mockMethodName, testCaseName));
+    }
+
     /**
      * Expect mock method invoked with specified parameters
      * @param args parameters to compare
diff --git a/testable-core/src/main/java/com/alibaba/testable/core/tool/TestableTool.java b/testable-core/src/main/java/com/alibaba/testable/core/tool/TestableTool.java
index ad1de58..47c5d38 100644
--- a/testable-core/src/main/java/com/alibaba/testable/core/tool/TestableTool.java
+++ b/testable-core/src/main/java/com/alibaba/testable/core/tool/TestableTool.java
@@ -1,9 +1,5 @@
 package com.alibaba.testable.core.tool;
 
-import com.alibaba.testable.core.matcher.InvokeVerifier;
-import com.alibaba.testable.core.util.InvokeRecordUtil;
-import com.alibaba.testable.core.util.TestableUtil;
-
 /**
  * @author flin
  */
@@ -24,14 +20,4 @@ public class TestableTool {
      */
     public static String SOURCE_METHOD;
 
-    /**
-     * Get counter to check whether specified mock method invoked
-     * @param mockMethodName name of a mock method
-     */
-    public static InvokeVerifier verify(String mockMethodName) {
-        String testClass = Thread.currentThread().getStackTrace()[InvokeRecordUtil.INDEX_OF_TEST_CLASS].getClassName();
-        String testCaseName = TestableUtil.currentTestCaseName(testClass);
-        return new InvokeVerifier(InvokeRecordUtil.getInvokeRecord(mockMethodName, testCaseName));
-    }
-
 }