What version of OpenRewrite are you using?

• rewrite-testing-frameworks: 3.35.2
• rewrite-core: 8.81.1
• rewrite-java: 8.81.1

What is the smallest, simplest way to reproduce the problem?

import static org.mockito.Mockito.doNothing;

import org.mockito.ArgumentCaptor;
import org.mockito.Mock;

class ExampleTest {
  @Mock Client client;
  ArgumentCaptor<String> captor = ArgumentCaptor.forClass(String.class);

  void setUp() {
    doNothing().when(client).send(captor.capture());
  }

  interface Client {
    void send(String message);
  }
}

Run org.openrewrite.java.testing.mockito.RemoveDoNothingForDefaultMocks.

What did you expect to see?

The stubbing should be preserved because captor.capture() has a side effect. Removing the stubbing changes test behavior.

What did you see instead?

The recipe removes the entire doNothing().when(...) stubbing:

class ExampleTest {
  @Mock Client client;
  ArgumentCaptor<String> captor = ArgumentCaptor.forClass(String.class);

  void setUp() {
  }

  interface Client {
    void send(String message);
  }
}

Any later use of captor.getValue() can fail because no value was captured.