Fixed two tests in JsonSerDeTest

[Sujishark]

What is the purpose of the change:
To address the validation issue created due to the potential variations in String ordering during comparison.

This PR aims to fix two tests:

org.openx.data.jsonserde.JsonSerDeTest.testNestedExplicitNullValue
org.openx.data.jsonserde.JsonSerDeTest.testExplicitNullValue

REASON AND FIX:

The issue arises while serializing the {column: column types} pair, the result returned is not in a constant order. This is because result is a JSONObject which internally uses HashMap and doesn’t maintain order.

Hive-JSON-Serde/json-serde/src/main/java/org/openx/data/jsonserde/JsonSerDe.java

Line 265 in 7a05e91

JSONObject result = new JSONObject();

Due to this, validating the jsonStr with another string doesn’t turn out to return true.
The fix is to modify the assert statements in a way to check only the presence of the individual key-value pair and ignore the order.

REPRODUCE:
This was found by using the NonDex tool.

cd Hive-JSON-Serde
mvn install -pl json-serde -am -DskipTests
mvn -pl json-serde edu.illinois:nondex-maven-plugin:2.1.1:nondex -Dtest=org.openx.data.jsonserde.JsonSerDeTest#testNestedExplicitNullValue