Preimages tests

[xlc]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.91603% with 25 lines in your changes missing coverage. Please review.

Project coverage is 78.12%. Comparing base (74aa897) to head (078d008).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
JAMTests/Tests/JAMTests/PreimagesTests.swift	83.33%	12 Missing ⚠️
Blockchain/Sources/Blockchain/State/State.swift	0.00%	7 Missing ⚠️
.../Sources/Blockchain/RuntimeProtocols/Runtime.swift	0.00%	4 Missing ⚠️
...ources/Blockchain/RuntimeProtocols/Preimages.swift	97.56%	1 Missing ⚠️
...chain/Sources/Blockchain/Types/HashAndLength.swift	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #263      +/-   ##
==========================================
+ Coverage   78.02%   78.12%   +0.10%     
==========================================
  Files         291      293       +2     
  Lines       22960    23057      +97     
==========================================
+ Hits        17915    18014      +99     
+ Misses       5045     5043       -2     

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