bug #72 Allow accessing a context in another context (pamil)

This PR was merged into the 2.0 branch.

Discussion
----------

Fixes #71.

Commits
-------

13d64ca7cb Allow accessing a context in another context

features/sanity_checks/accessing_a_context_in_another_context.feature

@@ -0,0 +1,70 @@
+Feature: Accessing a context in another context
+
+    Scenario: Accessing a context in another context
+        Given a working Symfony application with SymfonyExtension configured
+        And a Behat configuration containing:
+        """
+        default:
+            suites:
+                default:
+                    contexts:
+                        - App\Tests\SomeContext
+                        - App\Tests\AnotherContext
+        """
+        And a feature file containing:
+        """
+        Feature:
+            Scenario:
+                Then it should pass
+        """
+        And a context file "tests/SomeContext.php" containing:
+        """
+        <?php
+
+        namespace App\Tests;
+
+        use Behat\Behat\Context\Context;
+
+        final class SomeContext implements Context {
+            public function someMethod(): void {}
+        }
+        """
+        And a context file "tests/AnotherContext.php" containing:
+        """
+        <?php
+
+        namespace App\Tests;
+
+        use Behat\Behat\Context\Context;
+        use Behat\Behat\Hook\Scope\BeforeScenarioScope;
+
+        final class AnotherContext implements Context {
+            /** @var SomeContext */
+            private $someContext;
+
+            /** @BeforeScenario */
+            public function gatherContexts(BeforeScenarioScope $scope)
+            {
+                $environment = $scope->getEnvironment();
+
+                $this->someContext = $environment->getContext('App\Tests\SomeContext');
+            }
+
+            /** @Then it should pass */
+            public function itShouldPass(): void
+            {
+                $this->someContext->someMethod();
+            }
+        }
+        """
+        And a YAML services file containing:
+            """
+            services:
+                App\Tests\SomeContext:
+                    public: true
+
+                App\Tests\AnotherContext:
+                    public: true
+            """
+        When I run Behat
+        Then it should pass

src/Context/Environment/InitializedSymfonyExtensionEnvironment.php

@@ -72,9 +72,11 @@ final class InitializedSymfonyExtensionEnvironment implements SymfonyExtensionEn
     }
 
     /**
+     * @see http://behat.org/en/latest/cookbooks/accessing_contexts_from_each_other.html
+     *
      * @throws ContextNotFoundException
      */
-    private function getContext(string $class): Context
+    public function getContext(string $class): Context
     {
         if (!isset($this->contexts[$class])) {
             throw new ContextNotFoundException(sprintf(