How to test file download using Behat version 3

Question

I implement the function in FeatureContext, but I do not know how to config in behat.yml

Here is my code

FeatureContext.php

/**
 * @Then /^the file ".+" should be downloaded$/
 * @param $filename
 *
 * @throws \Exception
 */
public function assertFileDownloaded($filename) {
    if (!file_exists('/download/dir/' . $filename)) {
        throw new Exception("Can not download");
    }
}

Download.feature

Scenario: Download unlock documents with Success Stories
  When I am on "managed-security-services/downloads/"
  Then I should be on "/managed-security-services/downloads/"
  And I should see "Bühler"
  Then I click on the text "Bühler"
  And I wait for "1" seconds
  And the file ".+" should be downloaded

I do not know how to pass argument to behat.yml Here is code

suites:
    default:
      paths: &featurePaths
        - '%paths.base%/features'
      contexts: &contexts
        - FeatureContext

When I run my test it shows message error like this:

[Behat\Testwork\Argument\Exception\UnknownParameterValueException] Can not find a matching value for an argument $filename of the method FeatureContext::assertFileDownloaded().

As reference in here How to test file download in Behat

Answer 1

Try this:

/**
 * @Then /^the file :filename should be downloaded$/
 *
 * @throws \Exception
 */
public function assertFileDownloaded($filename) {
    if (!file_exists('/download/dir/' . $filename)) {
        throw new Exception("Can not download");
    }
}