Fix flaky test UtilTest.testEnhanceResponseWithShippingAddressList

[Sujishark]

Description of changes:

This PR aims to fix a test:

com.amazon.pay.api.UtilTest.testEnhanceResponseWithShippingAddressList

This was found by using the NonDex tool.

REASON AND FIX

Encountered the following error while using NonDex:

com.amazon.pay.api.UtilTest.testEnhanceResponseWithShippingAddressList -- Time elapsed: 0.002 s <<< FAILURE!
org.junit.ComparisonFailure: expected:<...pingAddressList":[{"[city":null,"addressId":"amzn1.address.ABC","phoneNumber":"8910111213","postalCode":"123-4567","stateOrRegion":"MNO","county":null,"addressLine3":null,"name":"DEF","district":null,"countryCode":"JP","addressLine2":"JKL","addressLine1":"GHI"]}]}> but was:<...pingAddressList":[{"[postalCode":"123-4567","county":null,"addressId":"amzn1.address.ABC","phoneNumber":"8910111213","countryCode":"JP","addressLine3":null,"addressLine1":"GHI","addressLine2":"JKL","name":"DEF","stateOrRegion":"MNO","city":null,"district":null]}]}>
	at org.junit.Assert.assertEquals(Assert.java:117)
	at org.junit.Assert.assertEquals(Assert.java:146)
	at com.amazon.pay.api.UtilTest.testEnhanceResponseWithShippingAddressList(UtilTest.java:257)

The tests fails when the function testEnhanceResponseWithShippingAddressList() compares both strings (expectedCheckoutSessionResponse.RawResponse and actualCheckoutSessionResponseAfterEnhancing.RawResponse) with key-value pairs in it.

The JSON object is unordered since it uses Maps as their internal data structure. According to documentation,

"This class makes no guarantees as to the order of the map; in particular, it does not guarantee that the order will remain constant over time."

Due to this a non-deterministic order of key-value pairs are maintained and hence the assertEquals fails.

https://github.com/amzn/amazon-pay-api-sdk-java/blob/3ff564edb9509ca63ed7e8f77df9b42f3261f287/tst/com/amazon/pay/api/UtilTest.java#L257

One possible solution is to have those strings as JSONObjects and compare using JSONObject.similar(), which compares if the contents of two JSON objects are same, perhaps having a different order of attributes.

Reproduce:

This was found by using the NonDex tool.

The following command can be used to replicate the failures and validate the fix:

mvn edu.illinois:nondex-maven-plugin:2.1.1:nondex -Dtest=com.amazon.pay.api.UtilTest#testEnhanceResponseWithShippingAddressList

Environment:

Java: openjdk version "11.0.20.1" Maven: Apache Maven 3.6.3

No user-facing change. No dependency upgrade.

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