Fixed Flaky Test in WindowTest.java

[Sitara-a]

Description

The test simulatedMultithreadedProcessing in the test class com.cloudhopper.commons.util.windowing.WindowTest could fail if the same key is generated by two different threads.

Steps to reproduce

Run the test multiple times. The current logic to generate a key is:
Integer.valueOf(""+id+""+x);
Here id is a number between 0 and requestThreadCount-1
x is a number between 0 and requestsPerThread-1
However, this can generate duplicate keys in some scenarios. Eg- For id = 0, x = 26 -> Key is 26 and for id = 2, x = 6 -> Key is 26. This leads to a DuplicateKeyException being thrown.

Expected Behaviour

All tests should pass

Actual Behaviour

The test can fail if duplicate keys are generated.

Solution

The logic of defining a key is updated to - Integer.valueOf(""+id*requestsPerThread+""+x);
This way there are no duplicate keys generated.