1、异常提示：
To create a new mock, the existing static mock registration must be deregistered
2、原因分析
由提示信息可知，静态模拟已经注册过了，再次注册时必须先将之前的撤销。所以我们要撤销之前的注册信息，再执行。
这里提供另一种方法，将模拟静态的方法的代码放到 try-resources 块中执行，这样可以兼容多个注册信息，实际上是在只在本方法中有效。
3、解决办法
将要模拟静态方法的代码放到 try-resource 资源池中，如下：
try (MockedStatic<BeanUtil> beanUtilMockedStatic = mockStatic(BeanUtil.class)) {}
4、详细报错：
org.mockito.exceptions.base.MockitoException:
For cn.hutool.core.bean.BeanUtil, static mocking is already registered in the current thread
To create a new mock, the existing static mock registration must be deregistered
at com.abc.service.impl.TagManagerServiceImplTest.testTagImptUpdt(TagManagerServiceImplTest.java:532)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:232)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:55)
标签：ParentRunner,java,create,runners,org,deregistered,junit,mock From： https://www.cnblogs.com/hapday/p/18357024