public function nodes_are_ordered_by_date_and_returned_newest_first(): void {
// start test
  $this->createNode(['type' => 'article',
    'created' => (new DrupalDateTime('-2 days'))->getTimestamp()]);
  $this->createNode(['type' => 'article',
    'created' => (new DrupalDateTime('-1 week'))->getTimestamp()]);
  $this->createNode(['type' => 'article',
    'created' => (new DrupalDateTime('-1 hour'))->getTimestamp()]);
  $this->createNode(['type' => 'article',
  'created' => (new DrupalDateTime('-1 year'))->getTimestamp()]);
  $this->createNode(['type' => 'article',
    'created' => (new DrupalDateTime('-1 month'))->getTimestamp()]);

  $repository = $this->container->get(ArticleRepository::class);
  $nodes = $repository->getAll();

  $this->assertSame([3, 1, 2, 5, 4], array_keys($nodes));
// end test
}

// start output
F                                                                   1 / 1 (100%)

Time: 00:00.449, Memory: 8.00 MB

There was 1 failure:

1) Drupal\Tests\drupalcon\Kernel\ArticleRepositoryTest::nodes_are_ordered_by_date_and_
returned_newest_first
Failed asserting that two arrays are identical.
--- Expected
+++ Actual
@@ @@
 Array &0 (
-    0 => 3
-    1 => 1
-    2 => 2
-    3 => 5
-    4 => 4
+    0 => 1
+    1 => 2
+    2 => 3
+    3 => 4
+    4 => 5
 )

/app/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:121
/app/vendor/phpunit/phpunit/src/Framework/Constraint/IsIdentical.php:79
/app/web/modules/custom/drupalcon/tests/src/ArticleRepositoryTest.php:60
/app/vendor/phpunit/phpunit/src/Framework/TestResult.php:728

FAILURES!
Tests: 1, Assertions: 11, Failures: 1.
// end output