use blackbox macro instead of whitebox

[xuwei-k]

[codecov-io]

Codecov Report

Merging #30 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #30   +/-   ##
=======================================
  Coverage   84.69%   84.69%           
=======================================
  Files          33       33           
  Lines         464      464           
  Branches       55       55           
=======================================
  Hits          393      393           
  Misses         71       71

Impacted Files	Coverage Δ
...rc/main/scala/catalysts/testkit/syntax/JUnit.scala	100% <ø> (ø)	:arrow_up:
...ros/src/main/scala/catalysts/macros/TypeTagM.scala	100% <ø> (ø)	:arrow_up:
...rc/main/scala/catalysts/testkit/syntax/WSpec.scala	100% <ø> (ø)	:arrow_up:
...it/src/main/scala/catalysts/testkit/TestSpec.scala	100% <ø> (ø)	:arrow_up:
...c/main/scala/catalysts/testkit/syntax/FSuite.scala	100% <ø> (ø)	:arrow_up:

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