Added missing posterior_mean and rand for test models

[torfjelde]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 5578418790

• 15 of 15 (100.0%) changed or added relevant lines in 1 file are covered.
• 6 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.6%) to 77.28%

---

Files with Coverage Reduction	New Missed Lines	%
src/test_utils.jl	6	91.38%

Totals
Change from base Build 5564023611:	0.6%
Covered Lines:	2051
Relevant Lines:	2654

---

💛 - Coveralls

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.58 🎉

Comparison is base (3f80199) 76.69% compared to head (4fef9d2) 77.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #499      +/-   ##
==========================================
+ Coverage   76.69%   77.27%   +0.58%     
==========================================
  Files          22       22              
  Lines        2639     2654      +15     
==========================================
+ Hits         2024     2051      +27     
+ Misses        615      603      -12     

Impacted Files	Coverage Δ
src/test_utils.jl	91.38% <100.00%> (+1.38%)	⬆️

... and 1 file with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[yebai]

Thanks @torfjelde!