Write tests for ItemCountFieldValidationRule

Hi, Attaching the test patch for itemCountFieldValidationRule.
1> Test patch for itemCountFieldValidationRule.
2> Fixed 1x: The Drupal\Tests\field_validation\Kernel\Plugin\FieldValidationRule\EqualValuesValidationRuleTest::$modules property must be declared protected. See https://www.drupal.org/node/2909426 →

-  public static $modules = ['node', 'field_validation'];
+  protected static $modules = ['node', 'field_validation'];

The "protected" part of the patch already in the "tests for EqualValuesFieldValidationRule".
We can remove it here.

Sure, Adding a new patch. Thanks for the review.

committed

Automatically closed - issue fixed for 2 weeks with no activity.