Error
Mockito cannot mock this class: class com.cloudbees.jenkins.support.impl.GCLogs$VmArgumentFinder.
Mockito can only mock non-private & non-final classes.
If you're not sure why you're getting this error, please report to the mailing list.
Java               : 11
JVM vendor name    : AdoptOpenJDK
JVM vendor version : 11.0.6+10
JVM name           : OpenJDK 64-Bit Server VM
JVM version        : 11.0.6+10
JVM info           : mixed mode
OS name            : Linux
OS version         : 5.4.0-1029-aws
Underlying exception : org.mockito.exceptions.base.MockitoException: 
Cannot create mock for class com.cloudbees.jenkins.support.impl.GCLogs$VmArgumentFinder
The type is not public and its mock class is loaded by a different class loader.
This can have multiple reasons:
 - You are mocking a class with additional interfaces of another class loader
 - Mockito is loaded by a different class loader than the mocked type (e.g. with OSGi)
 - The thread's context class loader is different than the mock's class loader
Stacktrace
org.mockito.exceptions.base.MockitoException: 
Mockito cannot mock this class: class com.cloudbees.jenkins.support.impl.GCLogs$VmArgumentFinder.
Mockito can only mock non-private & non-final classes.
If you're not sure why you're getting this error, please report to the mailing list.
Java               : 11
JVM vendor name    : AdoptOpenJDK
JVM vendor version : 11.0.6+10
JVM name           : OpenJDK 64-Bit Server VM
JVM version        : 11.0.6+10
JVM info           : mixed mode
OS name            : Linux
OS version         : 5.4.0-1029-aws
Underlying exception : org.mockito.exceptions.base.MockitoException: 
Cannot create mock for class com.cloudbees.jenkins.support.impl.GCLogs$VmArgumentFinder
The type is not public and its mock class is loaded by a different class loader.
This can have multiple reasons:
 - You are mocking a class with additional interfaces of another class loader
 - Mockito is loaded by a different class loader than the mocked type (e.g. with OSGi)
 - The thread's context class loader is different than the mock's class loader
	at com.cloudbees.jenkins.support.impl.GCLogsTest.rotatedJava9Files(GCLogsTest.java:68)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	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.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$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:377)
	at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:138)
	at org.apache.maven.surefire.booter.ForkedBooter.run(ForkedBooter.java:465)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:451)
Caused by: org.mockito.exceptions.base.MockitoException: 
Cannot create mock for class com.cloudbees.jenkins.support.impl.GCLogs$VmArgumentFinder
The type is not public and its mock class is loaded by a different class loader.
This can have multiple reasons:
 - You are mocking a class with additional interfaces of another class loader
 - Mockito is loaded by a different class loader than the mocked type (e.g. with OSGi)
 - The thread's context class loader is different than the mock's class loader
	at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:153)
	at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:366)
	at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:175)
	at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:377)
	... 29 more