Mocking the Filesystem during BDD with Behat and PHPSpec - www.slashnode.com

FeatureContext.php

<?php

use Behat\Behat\Tester\Exception\PendingException;
use Behat\Behat\Context\SnippetAcceptingContext;
use Behat\Gherkin\Node\PyStringNode;
use Behat\Gherkin\Node\TableNode;

use org\bovigo\vfs\vfsStream;

/**
 * Behat context class.
 */
class FeatureContext implements SnippetAcceptingContext
{
    protected $filesystem;
    protected $config;
    protected $sut;

    /**
     * Initializes context.
     *
     * Every scenario gets its own context object.
     * You can also pass arbitrary arguments to the context constructor through behat.yml.
     */
    public function __construct()
    {
        $this->config = [];
    }

    /**
     * @Given there is a configuration file
     */
    public function thereIsAConfigurationFile()
    {
        $this->updateConfig();
    }

    /**
     * @Given the option :arg1 is configured to :arg2
     */
    public function theOptionIsConfiguredTo($arg1, $arg2)
    {
        $this->config[$arg1] = $arg2;
        $this->updateConfig();
    }

    /**
     * @When I load the configuration file
     */
    public function iLoadTheConfigurationFile()
    {
        $this->sut = Config::load(vfsStream::url('home/config.php'));
    }

    /**
     * @Then I should get :value as :option option
     */
    public function iShouldGetAsOption($value, $option)
    {
        $actual = $this->sut->get($option);

        if ($actual !== $value)
            throw new Exception("Expected {$option} to be '{$value}'!");
    }

    /**
     * @Given the option :arg1 is not yet configured
     */
    public function theOptionIsNotYetConfigured($arg1)
    {
        $this->config = [];
        $this->updateConfig();
    }

    /**
     * @Then I should get default value :default as :option
     */
    public function iShouldGetDefaultValueAs($default, $option)
    {
        $actual = $this->sut->get($option, $default);

        if ($actual !== $default)
            throw new Exception("Expected default of '{$default}' to be returned for {$option}, not '{$actual}'.");
    }

    /**
     * @When I set the :$option configuration option to :value
     */
    public function iSetTheConfigurationOptionTo($option, $value)
    {
        $this->sut->set($option, $value);
    }

    /**
     * @When I set the :option configuration option to :value
     */
    public function iSetTheConfigurationOptionTo2($option, $value)
    {
        $this->sut->set($option, $value);
    }

    private function updateConfig()
    {
        $config = '<?php return ' . var_export($this->config, true) . ';';

        $this->filesystem = vfsStream::setup('home', null, [
            'config.php' => $config
        ]);
    }
}