Ide Braakman
--- a/tests/src/Functional/DiffPluginVariousTest.php
+++ b/tests/src/Functional/DiffPluginVariousTest.php
    $this->assertSession()->pageTextContains($date_formatter->format($new_timestamp));
  }

+  /**
+   * Tests the Core plugin with a daterange field.
+   *
+   * @covers \Drupal\diff\Plugin\diff\Field\CoreFieldBuilder
+   */
+  public function testCorePluginDateRangeField(): void {