lowercase expected service ids

Internally, the ContainerBuilder lowercases all service ids referenced
in aliases. Therefore, the expected service id needs to be lowercased
first before being compared with the one obtained from the container.

Author: xabbuh

PhpUnit/ContainerBuilderHasAliasConstraint.php

@@ -79,7 +79,7 @@ private function evaluateServiceId(ContainerBuilder $containerBuilder, $returnRe
          */
         $actualServiceId = (string) $alias;
 
-        $constraint = new \PHPUnit_Framework_Constraint_IsEqual($this->expectedServiceId);
+        $constraint = new \PHPUnit_Framework_Constraint_IsEqual(strtolower($this->expectedServiceId));
         if (!$constraint->evaluate($actualServiceId, '', true)) {
             if ($returnResult) {
                 return false;

Tests/PhpUnit/ContainerBuilderHasAliasConstraintTest.php

@@ -73,4 +73,16 @@ public function it_expects_a_string_for_service_id()
         $this->setExpectedException('\InvalidArgumentException', 'string');
         new ContainerBuilderHasAliasConstraint('alias_id', new \stdClass());
     }
+
+    /**
+     * @test
+     */
+    public function it_lower_cases_aliased_service_ids()
+    {
+        $containerBuilder = new ContainerBuilder();
+        $containerBuilder->setAlias('foo', 'fooBar');
+        $constraint = new ContainerBuilderHasAliasConstraint('foo', 'fooBar');
+
+        $this->assertTrue($constraint->evaluate($containerBuilder, null, true));
+    }
 }