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Your privClaimID variable will be null because the expression assigned to it returns null so the ClaimData = ... query returns no rows, hence the error.
This Building a Controller Extension documentation may help you with the design of your controller. And in tests, objects such as your testClaim have to be inserted into the database to have an Id value ...
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Your SOQL query does not return any rows while you are trying to assign it to actual sObject. You should set testClaim.Id in yout test class to Page parameters, so in your controller you can get privClaimID from page params.
I also strongly recommend you to post your questions with actual code and not screenshots, it makes answering your question a lot ...
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