--- /dev/null
+<?php
+
+namespace Drupal\Tests\Core\DependencyInjection;
+
+use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\Tests\UnitTestCase;
+use Drupal\Tests\Core\DependencyInjection\Fixture\BarClass;
+
+/**
+ * @coversDefaultClass \Drupal\Core\DependencyInjection\ContainerBuilder
+ * @group DependencyInjection
+ */
+class ContainerBuilderTest extends UnitTestCase {
+
+ /**
+ * @covers ::get
+ */
+ public function testGet() {
+ $container = new ContainerBuilder();
+ $container->register('bar', 'Drupal\Tests\Core\DependencyInjection\Fixture\BarClass');
+
+ $result = $container->get('bar');
+ $this->assertTrue($result instanceof BarClass);
+ }
+
+ /**
+ * @covers ::set
+ */
+ public function testSet() {
+ $container = new ContainerBuilder();
+ $class = new BarClass();
+ $container->set('bar', $class);
+ $this->assertEquals('bar', $class->_serviceId);
+ }
+
+ /**
+ * @covers ::set
+ */
+ public function testSetException() {
+ $container = new ContainerBuilder();
+ $class = new BarClass();
+ $this->setExpectedException(\InvalidArgumentException::class, 'Service ID names must be lowercase: Bar');
+ $container->set('Bar', $class);
+ }
+
+ /**
+ * @covers ::setParameter
+ */
+ public function testSetParameterException() {
+ $container = new ContainerBuilder();
+ $this->setExpectedException(\InvalidArgumentException::class, 'Parameter names must be lowercase: Buzz');
+ $container->setParameter('Buzz', 'buzz');
+ }
+
+ /**
+ * @covers ::register
+ */
+ public function testRegisterException() {
+ $container = new ContainerBuilder();
+ $this->setExpectedException(\InvalidArgumentException::class, 'Service ID names must be lowercase: Bar');
+ $container->register('Bar');
+ }
+
+ /**
+ * Tests serialization.
+ */
+ public function testSerialize() {
+ $container = new ContainerBuilder();
+ $this->setExpectedException(\AssertionError::class);
+ serialize($container);
+ }
+
+}