Mocking of KubernetesClient throws InvalidUseOfMatchersException: Could not evaluate toString()

Asked Jan 12 '22 at 08:52

Active Jan 12 '22 at 11:51

Viewed 464 times

for my test I need to mock a io.fabric8.kubernetes.client.KubernetesClient. This is what my test looks like:

    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
    KubernetesClient kubernetesClient;

    ...

    @Test
    void dummyTest() {
        when(kubernetesClient.resources(any()).inNamespace(eq("integration")).withName(eq("bar")).get()).thenReturn(createMockSubscriptionResource());
        ...
    }

I would expect that this line would create a deep-stub for this method-chain. However, when I execute the test I get the following exception:

Method threw 'org.mockito.exceptions.misusing.InvalidUseOfMatchersException' exception. Cannot evaluate io.fabric8.kubernetes.client.KubernetesClient$MockitoMock$1322763925.toString()

This results in a null-pointer-exception. I am wondering why Mockito is trying to call .toString() and why I am getting this error at all. Can anyone give me a hint here?

Thanks in advance!

edited Jan 12 '22 at 11:51

Turo

4,724
2
14
27

asked Jan 12 '22 at 08:52

ledex

Does this happen in your IDE? In a debug run? – Lesiak Jan 12 '22 at 09:30
Yes, this happens during a debug-run of the test. – ledex Jan 12 '22 at 10:15
What IDE are you using? – Lesiak Jan 12 '22 at 10:27
IntelliJ IDEA 2021.3.1 (Ultimate Edition) - Build #IU-213.6461.79, built on December 28, 2021 – ledex Jan 12 '22 at 13:23
1

Then it must be a variant of: https://stackoverflow.com/a/69628236/1570854 – Lesiak Jan 12 '22 at 13:28
Thanks a lot! The solution from this thread solved this issue. However, I still get a null-pointer-exception in the line. But that seems to be another error. – ledex Jan 12 '22 at 14:42

Mocking of KubernetesClient throws InvalidUseOfMatchersException: Could not evaluate toString()

0 Answers0