Investigate how to implement custom assertions

[msha1026]

As an engineer I would like to investigate how BenchPress could leverage Pester's custom assertions.

Pester allows developers to define their own custom assertions. Could we use this in some way so that we can create an assertion that a user of BenchPress could use? (i.e. Should-BeAvailable when checking if a resource exists) How would we bootstrap this custom assertion into the BenchPress module?

• [x] Document investigation and come to agreement with team
• [x] Create subsequent issues for follow up implementation
• [x] Bring to design session for discussion around implementation details
• [x] Update #147 with correct acceptance criteria

[jasonshortphd]

Leaving design in Milestone 2. Implementation can move to Milestone 3.

[ozboms]

Wiki is updated here to close out this task with investigation findings.