Add IBM Slip tests

[haochey]

Description

This PR adds a few test cases for slip IBM.

Type of change

• Something else

Scope

• This PR comprises a set of related changes with a common goal

If you cannot check the above box, please split your PR into multiple PRs that each have a common goal.

How Has This Been Tested?

Test Configuration: Repeat the IBM tests with "Slip" true.

• What computers and compilers did you use to test this: MacOS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.74%. Comparing base (43812d8) to head (59fa254).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #791      +/-   ##
==========================================
+ Coverage   43.72%   43.74%   +0.01%     
==========================================
  Files          65       65              
  Lines       19035    19039       +4     
  Branches     2331     2332       +1     
==========================================
+ Hits         8324     8328       +4     
+ Misses       9304     9303       -1     
- Partials     1407     1408       +1     

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[sbryngelson]

@haochey will you fix the Frontier problem?

[haochey]

@haochey will you fix the Frontier problem?

@sbryngelson Yes, I will work on this once my OCLF account and RSA token is enabled.

[anandrdbz]

Suggested changes to Haocheng for slip cases; should be good to go

[sbryngelson]

Will merge once benchmarking passes, thanks @haochey !