Added test scenarios for data store service

[ct-anaalbic]

Signed-off-by: ana.albic.comtrade Ana.Albic@comtrade.com

Brief description of the PR.
Added integration test scenarios for data store service.

Related Issue
This PR represents test scenarios for changes which are made on PR #2674

Description of the solution adopted
In this PR, test scenarios are added for newExistPredicate. With this added predicate, message filter only finds messages which are connected with chosen metric. Messages are searched by one metric, two metrics, all metric and in last scenario number of messages are incorrect, and Assertion Error is thrown. Added scenarios in DataStore.feature file are:

1. Find correct number of messages by corresponding metric
2. Finding correct number of messages by corresponding two metrics
3. Finding all messages by selecting all metrics
4. Finding messages with incorrect metric parameters

Screenshots
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Any side note on the changes made
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[LeoNerdoG]

Hej @lorthirk,
I have checked these tests and they look ok. Ana has followed my scenarios regarding this, so I hope we have covered all cases. The cases are:

• Find correct number of messages by corresponding metric
• Finding correct number of messages by corresponding two metrics
• Finding all messages by selecting all metrics
• Finding Messages With incorrect Metric parameters

Maybe we have missed something. If you have any additional ideas, please share them with us and we will implement them.
If everything is OK though, please merge into develop as all tests have passed.