Testing process - 1st draft

[costateixeira]

Added a description of testing - to review , it should be compatible with the different test approaches found so far (i.e. the different tooling and methods).

Summary:

• Testing consists of test data + test scripts
• examples in the IG are the minimal test data (for a smoke test)
• test data should be created from functional (L2) definitions or criteria
• acceptance criteria can / should(?) be exposed in L2 - as an author, list the scenarios and expected outcomes.
• test scripts will contain the assertions and steps, and make use of test data
• some test data may be available or generated externally.
• test scripts + test data are placed on a test tool/framework

Still to define: Are test resources part of the same IG? Or created separately? started discussion here
https://chat.fhir.org/#narrow/stream/231245-testing/topic/Test.20packages.20.2F.20test.20content