Inject a new instance of EntityTypeManager

> ArgumentCountError: Too few arguments to function Drupal\Core\Entity\EntityTypeManager::__construct(), 0 passed in /home/opdavies/Code/github.com/opdavies/atdc/web/modules/custom/example/tests/src/Unit/PostNodeRepositoryUnitTest.php on line 17 and exactly 6 expected

web/modules/custom/example/tests/src/Unit/PostNodeRepositoryUnitTest.php

@@ -12,7 +12,9 @@ final class PostNodeRepositoryUnitTest extends UnitTestCase {
 
   /** @test */
   public function it_returns_posts(): void {
-    $repository = new PostNodeRepository();
+    $repository = new PostNodeRepository(
+      new EntityTypeManager(),
+    );
   }
 
 }