CFINSPEC-374 DSL keyword only_applicable_if added

[Nik08]

Description

DSL keyword only_applicable_if will help set the impact value to zero conditionally when the condition inside the block is not true. It also invokes a failure test in the result containing the reason for why it is not applicable.

Usage:

control "test-1" do
  only_applicable_if ("Some reason for N/A") { false }
  impact 1.0
  describe ...
end

Output:

×  test-1: No-op
     ×  No-op 
     N/A control due to only_applicable_if condition: Some reason for N/A

Related Issue

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New content (non-breaking change)
• Breaking change (a content change which would break existing functionality or processes)

Checklist:

• I have read the CONTRIBUTING document.

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[clintoncwolfe]

Thanks!

[Vasu1105]

While going through the test I felt that we could have added enhanced outcomes and attestation tests in different files as we did for the streaming progress bar test, as this inspec exec test file is getting bigger and bigger. This is not something as a blocker for this PR just a suggestion.

[Vasu1105]

@Nik08 Verify pipeline is failing.