tests: Add spec tests.

spec/EcPhp/PhpDirectiveBundle/DependencyInjection/PhpDirectiveExtensionSpec.php

@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ *
+ * @see https://github.com/ecphp
+ */
+
+declare(strict_types=1);
+
+namespace spec\EcPhp\PhpDirectiveBundle\DependencyInjection;
+
+use EcPhp\PhpDirectiveBundle\DependencyInjection\PhpDirectiveExtension;
+use EcPhp\PhpDirectiveBundle\EventListener\SetPhpDirective;
+use PhpSpec\ObjectBehavior;
+use Prophecy\Argument;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
+
+class PhpDirectiveExtensionSpec extends ObjectBehavior
+{
+    public function it_is_initializable()
+    {
+        $this->shouldHaveType(PhpDirectiveExtension::class);
+    }
+
+    public function it_load_the_Symfony_extension(ContainerBuilder $containerBuilder)
+    {
+        $containerBuilder
+            ->setParameter(
+                'php_directive',
+                ['user_ini_file' => '%env(resolve:USER_INI_FILE)%']
+            )
+            ->shouldBeCalled();
+
+        $containerBuilder
+            ->setDefinition(
+                SetPhpDirective::class,
+                Argument::type(Definition::class)
+            )
+            ->shouldBeCalled();
+
+        $containerBuilder
+            ->removeBindings(
+                SetPhpDirective::class
+            )
+            ->shouldBeCalled();
+
+        $containerBuilder
+            ->fileExists(Argument::any())
+            ->willReturn(true);
+
+        $this
+            ->load([], $containerBuilder);
+    }
+}