MAGETWO-95709: Exception is thrown when Customer Address attribute with unique admin options is saved

Author: svitja

app/code/Magento/Eav/Test/Mftf/Section/AdminAttributesEditSection.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ /**
+  * Copyright © Magento, Inc. All rights reserved.
+  * See COPYING.txt for license details.
+  */
+-->
+<sections xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:noNamespaceSchemaLocation="urn:magento:mftf:Page/etc/SectionObject.xsd">
+    <section name="AdminAttributesEditSection">
+        <element name="label" type="input" selector="#attribute_label"/>
+        <element name="code" type="input" selector="#attribute_code"/>
+        <element name="inputType" type="select" selector="#frontend_input"/>
+        <element name="valuesRequired" type="select" selector="#is_required"/>
+    </section>
+</sections>

app/code/Magento/Eav/Test/Mftf/Section/AdminAttributesGridSection.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ /**
+  * Copyright © Magento, Inc. All rights reserved.
+  * See COPYING.txt for license details.
+  */
+-->
+<sections xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:noNamespaceSchemaLocation="urn:magento:mftf:Page/etc/SectionObject.xsd">
+    <section name="AdminAttributesGridSection">
+        <element name="attribute" type="text" selector="//td[contains(text(), '{{arg3}}')]" parameterized="true"/>
+    </section>
+</sections>