/**
   * Test if the model contains a <code>null</code> {@link Client} by passing an invalid ID
   * argument. The following conditions are checked :<br>
   *
   * <ul>
   *   <li>The model contains an attribute called "client"
   *   <li>This attribute has a <code>null</code> value
   * </ul>
   */
  @Test
  public void testViewWithInvalidId() {
    controller.view(m, Long.MAX_VALUE);
    Map<String, Object> map = m.asMap();

    assertTrue(m.containsAttribute("client"));
    assertNull(map.get("client"));
  }
  /**
   * Test if the model contains the correct {@link Client} object. The following conditions are
   * checked :<br>
   *
   * <ul>
   *   <li>The model contains an attribute called "client"
   *   <li>The attribute "client" is equal to the {@link Client} created before in setUp() method
   * </ul>
   */
  @Test
  public void testView() {
    controller.view(m, clientId);
    Map<String, Object> map = m.asMap();

    assertTrue(m.containsAttribute("client"));
    Client c = (Client) map.get("client");
    assertEquals(client, c);
  }