我假设你使用PHP和Angular不使它成为一个非常标准的日期字段。执行以下操作（Behat 3）在最后一步之前不会抛出任何错误，因为它也不会更改实际值。

I assume you are using PHP and Angular, which doesn't make it a very standard date field. Doing the following (Behat 3) doesn't throw any errors up until the last step, because it doesn't change the actual value either.

/**
 * @When /^I select a "(?P<id>.+)" date of "(?P<date>.+)"$/
 *
 * @param $id
 * @param $date
 */
public function startDate($id, $date)
{
    $this->getSession()->getPage()->find('css', '#' . $id)->setValue($date);
}

@javascript
Scenario: Test
    When I go to "https://docs.angularjs.org/examples/example-date-input-directive/index.html"
    And I select a "exampleInput" date of "2013-11-11"
    Then I should see "2013-11-11"

看起来组件必须从javascript接收到值，特别是查看这。

It looks like that the component must receive a value from the javascript, especially looking at this.

编辑：

为了做到这一点，你可以使用JS，虽然如果一个熟悉Angular的人可能建议一个更简单的方法：

To do this with JS you can use the following, though if a person familiar with Angular might suggest a simpler approach:

/**
 * @When /^I select date of "(?P<date>.+)"$/
 *
 * @param $date
 */
public function startDate($date)
{
    $element = $this->findElement('//*[@id="exampleInput"]');

    $script = '
        (function(){
            var element = document.evaluate(\'' . $element->getXpath() . '\', document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
            var $scope = angular.element(element).scope();
            $scope.$apply(function() {
                $scope.value = new Date(\'' . $date . '\');
            });
        })();
        ';

    $this->getSession()->executeScript($script);
}

@javascript
Scenario: Test
    When I go to "https://docs.angularjs.org/examples/example-date-input-directive/index.html"
    And I select date of "2013-11-11"
    Then I should see "2013-11-11"

测试通过，值被更新。