Create block middleware mock

[maier49]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier as per the readme code style guidelines
• Unit or Functional tests are included in the PR

Description:
Adds block middleware mock
Resolves #443

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[codecov]

Codecov Report

Merging #798 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #798   +/-   ##
=======================================
  Coverage   97.52%   97.53%           
=======================================
  Files         126      127    +1     
  Lines        7927     7941   +14     
  Branches     1824     1826    +2     
=======================================
+ Hits         7731     7745   +14     
  Misses        196      196           

Impacted Files	Coverage Δ
src/testing/mocks/middleware/block.ts	100.00% <100.00%> (ø)

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