Mocking static methods with Mockito

Question

I\'ve written a factory to produce java.sql.Connection objects:

public class MySQLDatabaseConnectionFactory implements DatabaseConnectionFactory         


        

Answer 1

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

https://github.com/mockito/mockito/tree/v3.4.0

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

In your case, something like this:

  @Test
  public void testStaticMockWithVerification() throws SQLException {
    try (MockedStatic 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: this feature requires mockito-inline dependency.