Journey to >= 90% test coverage

[adelbertc]

Type class composition and MonadState tests

[ngbinh]

not sure why this one is still failing. The build was stopped only after ~20 minutes though. Let me try to upgrade scala.js to 0.6.8 (which contains some performance fixes) to see if the problems go away.

[adelbertc]

Seems everyone else's builds are succeeding again except this one :( Even after 0.6.8

EDIT I realize it might've been due to my use of List in the new tests. Let's try this again

[codecov-io]

Current coverage is 89.78%

Merging #941 into master will increase coverage by +0.90% as of 603d318

@@            master    #941   diff @@
======================================
  Files          180     180       
  Stmts         2142    2144     +2
  Branches        42      42       
  Methods          0       0       
======================================
+ Hit           1904    1925    +21
  Partial          0       0       
+ Missed         238     219    -19

Review entire Coverage Diff as of 603d318

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[ceedubs]

Current coverage is 89.78%

So close to 90!

👍