Issue #3496496 by lhridley: Fix mocking in existing tests so that test objects...

Issue #3496496 by lhridley: Fix mocking in existing tests so that test objects can be created and tests and proceed.

tests/src/Kernel/CollectionOptimizerTest.php

@@ -3,8 +3,8 @@
 namespace Drupal\Tests\flysystem\Kernel;
 
 use Drupal\Core\Asset\AssetCollectionGrouperInterface;
+use Drupal\Core\Asset\AssetOptimizerInterface;
 use Drupal\Core\Asset\CssOptimizer;
-use Drupal\Core\Asset\JsOptimizer;
 use Drupal\Core\State\StateInterface;
 use Drupal\flysystem\Asset\AssetDumper;
 use Drupal\flysystem\Asset\CssCollectionOptimizer;
@@ -75,8 +75,9 @@ class CollectionOptimizerTest extends KernelTestBase {
     $grouper = $this->prophesize(AssetCollectionGrouperInterface::class);
     $dumper = $this->prophesize(AssetDumper::class);
     $state = $this->prophesize(StateInterface::class);
+    $jsOptimizer = $this->prophesize(AssetOptimizerInterface::class);
 
-    $optimizer = new JsCollectionOptimizer($grouper->reveal(), new JsOptimizer(), $dumper->reveal(), $state->reveal(), $this->container->get('file_system'));
+    $optimizer = new JsCollectionOptimizer($grouper->reveal(), $jsOptimizer->reveal(), $dumper->reveal(), $state->reveal(), $this->container->get('file_system'));
     $optimizer->deleteAll();
 
     foreach ($this->jsFilesUnderTest() as $js_file => $expired) {