Mocking static methods with Mockito

Mocking of static methods in Mockito is possible since Mockito 3.4.0.
For more details see:

https://github.com/mockito/mockito/releases/tag/v3.4.0

https://github.com/mockito/mockito/issues/1013

https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#static_mocks

assertEquals("foo", Foo.method());
try (MockedStatic mocked = mockStatic(Foo.class)) {
 mocked.when(Foo::method).thenReturn("bar");
 assertEquals("bar", Foo.method());
 mocked.verify(Foo::method);
}
assertEquals("foo", Foo.method());

In your case, something like this:

  @Test
  public void testStaticMockWithVerification() throws SQLException {
    try (MockedStatic<DriverManager> dummy = Mockito.mockStatic(DriverManager.class)) {
      DatabaseConnectionFactory factory = new MySQLDatabaseConnectionFactory();
      dummy.when(() -> DriverManager.getConnection("arg1", "arg2", "arg3"))
        .thenReturn(new Connection() {/*...*/});

      factory.getConnection();

      dummy.verify(() -> DriverManager.getConnection(eq("arg1"), eq("arg2"), eq("arg3")));
    }
  }

NOTE: mocking STATIC METHODS requires mockito-inline dependency instead of mockito-core.

For JUnit5 also add this:

<dependency>
  <groupId>org.mockito</groupId>
  <artifactId>mockito-junit-jupiter</artifactId>
  <version>${mockito.version}</version>
  <scope>test</scope>
</dependency>