MNT New Behat tests for toast messages

tests/behat/features/gridfield-toast-messages.feature

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+Feature: Show toast messages
+  As an author
+  I want to see toast message in the CMS when I create, edit, delete, publish, unpublish, archive a record
+
+  Background:
+    Given the "Company" "Company A" with "Category"="Other" 
+    And the "Company" "Company B" with "Category"="Other"
+    And the "Company" "Company C" with "Category"="Other"
+    And the "Employee" "Employee A" with "Company"="1"
+    And the "Employee" "Employee B" with "Company"="1"
+    And the "Employee" "Employee C" with "Company"="1"
+    the "group" "EDITOR" has permissions "Access to 'Pages' section" and "Access to 'Test ModelAdmin' section" and "TEST_DATAOBJECT_EDIT"
+    And I am logged in as a member of "EDITOR" group
+    And I go to "/admin/test"
+
+  Scenario: I can see toast message when I successfully create or publish a record
+    When I press the "Add Company" button
+    And I fill in "Name" with "My Company"
+    And I press the "Create" button
+    Then I should see a "Saved Company My Company successfully" success toast
+    And I fill in "Name" with "My New Company"
+    And I press the "Publish" button
+    Then I should see a "Published Company My New Company" success toast
+
+  Scenario: I can see toast message when I successfully unpublish and archive a record
+    When I click "Company B" in the "#Form_EditForm" element
+    And I click "More options" in the "#ActionMenus" element
+    And I press the "Unpublish" button, confirming the dialog
+    Then I should see a "Unpublished Company Company B" success toast
+    And I click "More options" in the "#ActionMenus" element
+    And I press the "Archive" button, confirming the dialog
+    And I should not see "Validation Error"
+    And I should not see "Company B" in the "#Form_EditForm" element
+    And I should see a "Archived Company Company B" success toast
+
+  Scenario: I can see toast message when I successfully delete a record
+    When I click "Company A" in the "#Form_EditForm" element
+    And I click "Employees" in the ".ui-tabs-nav" element
+    Then I should see "Employee A" in the "#Form_ItemEditForm_Employees" element
+    And I click "Employee A" in the "#Form_ItemEditForm_Employees" element
+    And I press the "Delete" button, confirming the dialog
+    Then I should see a "Deleted Employee Employee A" success toast
+    Then I should not see "Employee A" in the "#Form_ItemEditForm_Employees" element
+
+  Scenario: I can see toast message when I have validation errors
+    When I click "Company C" in the "#Form_EditForm" element
+    And I fill in "Name" with ""
+    And I press the "Save" button
+    Then I should see "Validation Error"
+    And I fill in "Name" with "New Company C"
+    Then I should see a "Saved Company New Company C successfully" success toast
+
+  Scenario: I can see toast message when I have validation errors when I edit a nested record
+    When I click "Company A" in the "#Form_EditForm" element
+    And I click "Employees" in the ".ui-tabs-nav" element
+    Then I should see "Employee B" in the "#Form_ItemEditForm_Employees" element
+    And I click "Employee B" in the "#Form_ItemEditForm_Employees" element
+    And I fill in "Name" with ""
+    And I press the "Save" button
+    Then I should see "Validation Error"