Resolve #3274693 "Webform handler test"

Closes #3274693

config/schema/advanced_email_validation.schema.yml

@@ -70,3 +70,69 @@ advanced_email_validation.settings:
         updated:
           type: boolean
           label: 'Email change'
+webform.handler.advanced_email_webform_validator_handler:
+  type: mapping
+  label: 'Email validation handler settings'
+  mapping:
+    override_site_defaults:
+      type: boolean
+      label: 'Override site defaults'
+    rules:
+      type: mapping
+      label: 'Rules'
+      mapping:
+        mx_lookup:
+          type: boolean
+        disposable:
+          type: boolean
+        free:
+          type: boolean
+        banned:
+          type: boolean
+    error_messages:
+      type: mapping
+      label: 'Error messages'
+      mapping:
+        basic:
+          type: text
+          label: 'Basic'
+        mx_lookup:
+          type: text
+          label: 'MX Lookup'
+        disposable:
+          type: text
+          label: 'Disposable domain'
+        free:
+          type: text
+          label: 'Free domain'
+        banned:
+          type: text
+          label: 'Banned domain'
+    domain_lists:
+      type: mapping
+      label: 'Domain lists'
+      mapping:
+        disposable:
+          type: sequence
+          sequence:
+            type: string
+        free:
+          type: sequence
+          sequence:
+            type: string
+        banned:
+          type: sequence
+          sequence:
+            type: string
+    local_list_only:
+      type: mapping
+      label: 'Local list only'
+      mapping:
+        disposable:
+          type: boolean
+        free:
+          type: boolean
+    emails:
+      type: sequence
+      sequence:
+        type: string