I had the same issue :(

Same Issue when using verifyStatic().
This happens for me also for version 2.11.0

Same issue.

I'm also seeing this issue with verifyStatic() calls. I've done some digging, and it looks like the classloader that is used to create the mock is not the same one used when we try to verifystatic. This can be seen because the hash code of the class object changed. If you step through the mock creation and the verification (when mockito puts/gets the mock from the mocks map in InlineByteBuddyMockMaker.Java) you can see that the hash codes are different.

Same issue ... We just migrated our project to springboot2 and thus got all the version upgrade and got these issue.
The "WHEN" issue with static method seems indeed to be related to 2.26.1 as @GFriedrich noted, since forcing version to 2.26.0 I can now by pass the "WHEN".
Only to crash on the "VERIFY" of the same method, with the same issue
_

org.mockito.exceptions.misusing.NotAMockException:
Argument passed to verify() is of type Class and is not a mock!

_

I was wrong in my previous statement about the issue being caused by different classloaders. I just spent the last 4 hours debugging, and the real issue is that mockito is storing an instance of the static class in the mocks map, and verify is passing in the static class object to verify. This results in mockito saying it doesn't have a mock to verify against. I'm looking to see what can be done, although it might require changes in mockito and not powermock.

I was able to get verifyStatic working with mockito 2.26.0 by forking mockito. It likely will only work if you are using the inline bytebuddy mock maker, which is what I'm using. I figured I'd share here in case someone has the time to make it work from the powermock side instead of the mockito side. The change I made was to add the following code to the createMock() of org/mockito/internal/creation/bytebuddy/InlineByteBuddyMockMaker.java (around line 183):

mocks.put(instance.getClass(), mockMethodInterceptor);

Hi @thekingnothing , but that PR does not actually fix the issue with when using the powermock rule. Can we re-open this ticket?

@rratmansky Sorry for the late response.
It works for me when testing with powermock rule.I was testing tests/mockito/junit4/src/test/java/samples/powermockito/junit4/system/SystemClassUserTest.java by doing the follows

1. copy it into "tests/mockito/junit4-rule-xstream" project (which provides necessary test dependencies)
2. remove @RunWith(PowerMockRunner.class)
3. add "@rule public final PowerMockRule rule = new PowerMockRule();"

Would you mind elaborating?

I had the same issue :(

1. mockStatic —— when(...).thenReturn(...)
2. com.nhaarman.mockitokotlin2 —— Mockito.any(T::class.java) ?: createInstance()

org.mockito.exceptions.misusing.NotAMockException: Argument should be a mock, but is: class java.lang.Class

+1 for this issue.

Our test suite runs okay with Mockito 2.23.4 / PowerMock 2.0.0 but fails when upgrading Mockito to 3.0.0:

org.mockito.exceptions.misusing.NotAMockException: Argument should be a mock, but is: class java.lang.Class

Our tests run fine with mockito 2.25.0 and powermock 2.0.2.

Ran into this same problem when updating from powermock 2.0.2 to 2.0.4 while leaving mockito at 2.25.0.

I'm having this issue if I add line " testImplementation 'org.mockito:mockito-inline:2.13.0' " to gradle.

If I eliminate it it works nice, but I need it to tests final classes and need to add this.

Ok, at last.... the solution was:
1- Eliminate line "testImplementation 'org.mockito:mockito-inline:2.13.0' " in graddle
2- Put a file named "configuration.properties" in your project under path "src\test\resources\org\powermock\extensions" with just one line inside "mockito.mock-maker-class=mock-maker-inline"

May be there shoud be any kind of libraries conflict when adding it through graddle file

Here is the full documentation:
https://github.com/powermock/powermock/wiki/mockito#mockito-mock-maker-inline

Sorry I see this has been fixed then re-opened ?
If i up to 2.0.2 or 2.0.4 I still have org.mockito.exceptions.misusing.NotAMockException: Argument should be a mock, but is: class java.lang.Class on my when call.
=> Had to update verifyStatic signature to specifiy the class, which gave me hope.

Same, added the configuration.properties per documentation and still getting NotAMockException. Using Mockito 2.23.0 and PowerMock 2.0.4

Do some have any idea, how to solve this issue?

Do some have any idea, how to solve this issue?

I've solved it for my project like this: stopped using PowerMock at all.

Following this example works for me with 2.0.4

https://github.com/powermock/powermock-examples-maven/blob/master/mockito2/src/test/resources/org/powermock/extensions/configuration.properties

        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-module-junit4</artifactId>
            <version>2.0.4</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-api-mockito2</artifactId>
            <version>2.0.4</version>
            <scope>test</scope>
        </dependency>

It's don't work with java 13

The problem still happens on the latest version of powermock and mockito 3.9.

src/test/resources/org/powermock/extensions/configuration.properties:
mockito.mock-maker-class=mock-maker-inline

It works for me.

2 of my tests were not passing with powermock 2.0.2. Many people here said that their tests passed using 2.0.4, i tried it and all my tests passed as well. I am using Mockito 3.6.28 with powermock 2.0.4 and Java 8.. Hope it helps someone!

@Alinakay30 I think that the best solution is just dropping powermock all together and use alternative libraries.

@jlondonno Use PowerMockito.when(MetricUtil.getNodeName()).thenAnswer((Answer) invocation -> "node1") instead of thenReturn method.

Hear is the stackoverflow answer... https://stackoverflow.com/questions/62742777/org-mockito-exceptions-misusing-notamockexception-argument-should-be-a-mock-bu

getting the same error on these lines

PowerMockito.spy(LogUtils::class.java)
PowerMockito.doNothing().`when`(LogUtils::class.java, "logException", any())

now i use thenAnswer instead

with powermock 2.0.9 and mockito 3.3.3, this bug still exsit

@jlondonno Use PowerMockito.when(MetricUtil.getNodeName()).thenAnswer((Answer) invocation -> "node1") instead of thenReturn method.
Hear is the stackoverflow answer... https://stackoverflow.com/questions/62742777/org-mockito-exceptions-misusing-notamockexception-argument-should-be-a-mock-bu

getting the same error on these lines

PowerMockito.spy(LogUtils::class.java)
PowerMockito.doNothing().`when`(LogUtils::class.java, "logException", any())

@iamarjun I updated the SO answer you linked to include my work around.

Same issue with powermock 2.0.9 and mockito 3.12.4

Same issue (powermock 2.0.9 and mockito 3.12.4) when use power.verifyStatic() ,but it works well with Mockito

Same issue with powermock 2.0.9 and mockito 3.11.2

Same issue here with powermock 2.0.9 and mockito 2.28.2

Same issue here with powermock 2.0.9 and mockito 3.8.0

I arrived here via https://stackoverflow.com/questions/58752923/notamockexception-when-trying-to-verify-a-static-method

Using v 2.0.9 I was able to work around this by:

1. Creating a new file at the path src/test/resources/org/powermock/extensions/configuration.properties and including the key value pair mockito.mock-maker-class=mock-maker-inline
2. Deleting a previous configuration file which I had at the path src/test/resources/mockito-extensions/ org.mockito.plugins.MockMaker which previously included the phase mock-maker-line