MQE-388: Write store settings before tests

- add new test to demonstrate usage
- add new default config for restoring settings

Author: imeron2433

dev/tests/acceptance/tests/functional/Magento/FunctionalTest/Config/Data/braintreeData.xml

@@ -34,4 +34,32 @@
     <entity name="samplePrivateKey" type="private_key">
         <data key="value">somePrivateKey</data>
     </entity>
+
+    <!-- default configuration used to restore Magento config -->
+    <entity name="defaultBraintreeConfig" type="braintree_config_state">
+        <required-entity type="title">defaultTitle</required-entity>
+        <required-entity type="payment_action">defaultPaymentAction</required-entity>
+        <required-entity type="environment">defaultEnvironment</required-entity>
+        <required-entity type="merchant_id">defaultMerchantId</required-entity>
+        <required-entity type="public_key">defaultPublicKey</required-entity>
+        <required-entity type="private_key">defaultPrivateKey</required-entity>
+    </entity>
+    <entity name="defaultTitle" type="title">
+        <data key="value"/>
+    </entity>
+    <entity name="defaultPaymentAction" type="payment_action">
+        <data key="value"/>
+    </entity>
+    <entity name="defaultEnvironment" type="environment">
+        <data key="value"/>
+    </entity>
+    <entity name="defaultMerchantId" type="merchant_id">
+        <data key="value"/>
+    </entity>
+    <entity name="defaultPublicKey" type="public_key">
+        <data key="value"/>
+    </entity>
+    <entity name="defaultPrivateKey" type="private_key">
+        <data key="value"/>
+    </entity>
 </config>

dev/tests/acceptance/tests/functional/Magento/FunctionalTest/Config/Data/paypalData.xml

@@ -38,4 +38,24 @@
     <entity name="sampleUseProxy" type="use_proxy">
         <data key="value">0</data>
     </entity>
+
+    <!-- default configuration used to restore Magento config -->
+    <entity name="defaultPayPalConfig" type="paypal_config_state">
+        <required-entity type="business_account">defaultBusinessAccount</required-entity>
+        <required-entity type="api_username">defaultApiUsername</required-entity>
+        <required-entity type="api_password">defaultApiPassword</required-entity>
+        <required-entity type="api_signature">defaultApiSignature</required-entity>
+    </entity>
+    <entity name="defaultBusinessAccount" type="business_account">
+        <data key="value"/>
+    </entity>
+    <entity name="defaultApiUsername" type="api_username">
+        <data key="value"/>
+    </entity>
+    <entity name="defaultApiPassword" type="api_password">
+        <data key="value"/>
+    </entity>
+    <entity name="defaultApiSignature" type="api_signature">
+        <data key="value"/>
+    </entity>
 </config>

dev/tests/acceptance/tests/functional/Magento/FunctionalTest/SampleTests/Cest/SetPaymentConfigurationCest.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ /**
+  * Copyright © Magento, Inc. All rights reserved.
+  * See COPYING.txt for license details.
+  */
+-->
+
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="../../../../../../vendor/magento/magento2-functional-testing-framework/src/Magento/FunctionalTestingFramework/Test/etc/testSchema.xsd">
+    <cest name="SetPaymentConfigurationCest">
+        <test name="SetPaypalConfigurationTest">
+            <createData entity="samplePaypalConfig" mergeKey="createSamplePaypalConfig"/>
+            <createData entity="defaultPaypalConfig" mergeKey="restoreDefaultPaypalConfig"/>
+        </test>
+        <test name="SetBraintreeConfigurationTest">
+            <createData entity="sampleBraintreeConfig" mergeKey="createSampleBraintreeConfig"/>
+            <createData entity="defaultBraintreeConfig" mergeKey="restoreDefaultBraintreeConfig"/>
+        </test>
+    </cest>
+</config>