Ensure branch 7.4 will remain compatible with 8.0 once XML loaders are removed

Author: nicolas-grekas

Tests/RouteCollectionTest.php

@@ -105,9 +105,9 @@ public function testAddCollection()
     public function testAddCollectionWithResources()
     {
         $collection = new RouteCollection();
-        $collection->addResource($foo = new FileResource(__DIR__.'/Fixtures/foo.xml'));
+        $collection->addResource($foo = new FileResource(__DIR__.'/Fixtures/empty.yml'));
         $collection1 = new RouteCollection();
-        $collection1->addResource($foo1 = new FileResource(__DIR__.'/Fixtures/foo1.xml'));
+        $collection1->addResource($foo1 = new FileResource(__DIR__.'/Fixtures/file_resource.yml'));
         $collection->addCollection($collection1);
         $this->assertEquals([$foo, $foo1], $collection->getResources(), '->addCollection() merges resources');
     }
@@ -176,9 +176,9 @@ public function testAddPrefixOverridesDefaultsAndRequirements()
     public function testResource()
     {
         $collection = new RouteCollection();
-        $collection->addResource($foo = new FileResource(__DIR__.'/Fixtures/foo.xml'));
-        $collection->addResource($bar = new FileResource(__DIR__.'/Fixtures/bar.xml'));
-        $collection->addResource(new FileResource(__DIR__.'/Fixtures/foo.xml'));
+        $collection->addResource($foo = new FileResource(__DIR__.'/Fixtures/empty.yml'));
+        $collection->addResource($bar = new FileResource(__DIR__.'/Fixtures/file_resource.yml'));
+        $collection->addResource(new FileResource(__DIR__.'/Fixtures/empty.yml'));
 
         $this->assertEquals([$foo, $bar], $collection->getResources(),
             '->addResource() adds a resource and getResources() only returns unique ones by comparing the string representation');