Add dropdown cascade test

Author: mvorisek

tests-behat/dropdown.feature

@@ -0,0 +1,17 @@
+Feature: Dropdown
+
+  Scenario: dropdown cascade
+    Given I am on "form-control/dropdown-plus.php"
+    Then I select value "Beverages" in lookup "category_id"
+    Then I select value "Sugar/Sweetened" in lookup "sub_category_id"
+    Then I select value "Soda" in lookup "product_id"
+    When I click using selector "(//div[text()='Save'])[2]"
+    Then Modal is open with text '{ "category_id": "2", "sub_category_id": "9", "product_id": "4" }' in selector "p"
+    Then I click close modal
+    Then I should see "Soda"
+    Then I select value "Coffee and Tea" in lookup "sub_category_id"
+    Then I should not see "Soda"
+    Then I should not see "Cola"
+    Then I should not see "No results found."
+    When I click using selector "//div.field[label[text()='Product ID']]//div.ui.dropdown"
+    Then I should see "No results found."