Update runTest signature to match runBlocking

[twyatt]

No description provided.

[codecov]

Codecov Report

Merging #18 into main will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main      #18   +/-   ##
=========================================
  Coverage     71.42%   71.42%           
  Complexity       17       17           
=========================================
  Files             2        2           
  Lines            28       28           
  Branches          4        4           
=========================================
  Hits             20       20           
  Misses            8        8           

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[cedrickcooke]

Secret bonus of runTest -- if your last call in @Test fun foo() = runBlocking { /* here */ } returns a non-Unit value, the test will fail. Because runTest guarantees a Unit return, we don't have to worry about that.