Mock static void method with parameters using Mockito and JUnit 5

Question

I am trying to mock a static void method that takes a parameter, SMTPTools.send(Message)

My deps:

<dependency>
  <groupId>org.junit.jupiter</groupId>
  <artifactId>junit-jupiter-engine</artifactId>
  <version>5.7.0</version>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.mockito</groupId>
  <artifactId>mockito-core</artifactId>
  <version>3.6.0</version>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.mockito</groupId>
  <artifactId>mockito-inline</artifactId>
  <version>3.6.0</version>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.mockito</groupId>
  <artifactId>mockito-junit-jupiter</artifactId>
  <version>3.6.0</version>
  <scope>test</scope>
</dependency>

I tried:

try (MockedStatic<SMTPTools> smtpToolsMocked = Mockito.mockStatic(SMTPTools.class)) {
  smtpToolsMocked.when((msg) -> SMTPTools.send(msg)).thenAnswer((Answer<Void>) invocation -> null);
}

But it's not even compiling, because

The method when(MockedStatic.Verification) in the type MockedStatic is not applicable for the arguments (( msg) -> {})

But I don't understand why.

Answer 1

Ok it works with:

  @Test
  public void staticTest() throws Exception {
    try (MockedStatic<SMTPTools> smtpToolsMocked = Mockito.mockStatic(SMTPTools.class)) {
      Message msg = null;
      smtpToolsMocked.when((msg) -> SMTPTools.send(msg)).thenAnswer((Answer<Void>) invocation -> null);
      SMTPTools.send(msg);
      smtpToolsMocked.verify(Mockito.times(1), () -> SMTPTools.send(msg));
    }
  }