Mocking static methods with Mockito

Question

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

public class MySQLDatabaseConnectionFactory implements DatabaseConnectionFactory         


        

Answer 1

As mention @leokom, since Mockito 3.4.0 you can use the Mockito.mockStatic function to create mocks for static methods. Note that there are patches for this functionality in versions v3.4.2 and v3.4.6, Consider the use of a newer version.

In your case could be 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")));
    }
  }