EmployeeServiceTest

@RunWith(MockitoJUnitRunner.class)
public class EmployeeServiceTest {

  @Mock
  private EmployeeDao daoMock;

  @Test
  public void testFindManagerName() throws Exception {
    final Long employeeId = 666L;
    final String expectedManagerName = "Eran Harel";

    when(daoMock.findManager(employeeId)).thenReturn(new Employee(expectedManagerName));

    final String actualManagerName = new EmployeeService(daoMock).findManagerName(employeeId);
    assertEquals("expected name", expectedManagerName, actualManagerName);
  }
}