尚未在Mink上下文类上设置Getting `Mink instance.你启用水貂扩展了吗?`与Behat 3

Question

在我的composer.json:中

{
...
"behat/behat": "^3.6",
"behat/mink-extension": "^2.3",
"behat/mink-goutte-driver": "^1.2",
"behat/mink-selenium2-driver": "^1.4"
}

我的行为yml:

default:
autoload:
'': %paths.base%/features/bootstrap
suites:
default:
path:
- %paths.base%/features
contexts:
- FeatureContext
- BehatMinkExtensionContextMinkContext
- BehatMinkExtensionContextRawMinkContext
extensions:
BehatMinkExtension:
base_url: https://localhost:8443
goutte: ~      
selenium2: ~
javascript_session: selenium2
files_path: 'vendor'
sessions:
default:
selenium2: ~

我的功能上下文：

class FeatureContext extends MinkContext
{
/** @var BehatMinkElementDocumentElement */
protected $page;
/**
* Initializes context.
*
* Every scenario gets its own context instance.
* You can also pass arbitrary arguments to the
* context constructor through behat.yml.
*/
public function __construct()
{
$this->page = $this->getSession()->getPage();
}
/**
* @Given /^I am not logged in$/
*/
public function iAmNotLoggedIn()
{
// Do nothing
}
/**
* @When /^I visit .*$/
*/
public function iVisit($page)
{
$this->getSession()->visit('/login');
}
/**
* @Then /^I should see the login page$/
*/
public function iShouldSeeTheLoginPage()
{
$this->assertSession()->elementExists('css', '#username');
$this->assertSession()->elementExists('css', '#password');
$this->assertSession()->elementExists('css', '#submit');
}
}

我的功能文件：

Feature: Viewing the main page as an unauthenticated user
@javascript
Scenario: View the main page
Given I am not logged in
When I visit "/login"
Then I should see the login page

当我尝试运行behat命令时，我得到错误Mink instance has not been set on Mink context class. Have you enabled the Mink Extension?。我四处查看了有关这个错误的问题，并尽可能多地采取了修复步骤，但似乎没有一个能奏效。我缺什么了吗？

Answer 1

因此，在FeatureContext的构造函数中，我试图在会话完全实例化之前访问它。删除该行解决了问题。