test：添加提取PID测试用例

Author: ma2695212419

dongtai-agent/src/test/java/io/dongtai/iast/agent/manager/EngineManagerTest.java

@@ -0,0 +1,22 @@
+package io.dongtai.iast.agent.manager;
+
+import io.dongtai.iast.agent.IastProperties;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.lang.management.ManagementFactory;
+
+public class EngineManagerTest {
+
+    @Test
+    public void extractPIDTest(){
+        //初始化临时文件
+        IastProperties.initTmpDir();
+        //获取PID
+        String runtimeName = ManagementFactory.getRuntimeMXBean().getName();
+
+        //Java获取的runtimeName格式为 PID@虚拟机唯一标识 提取PID
+        String pid = EngineManager.extractPID(runtimeName);
+        Assert.assertTrue(pid.matches("\\d+"));
+    }
+}