test: fill out additional test targets

[danielroe]

SSR	Target	Commands	New test target
false	static	dev	Existing
true	static	dev	Existing
false	server	build + start	✅
false	static	generate	✅
true	server	build + start	✅
true	static	generate	✅

Time to complete (on my machine): 25s
Previous time to complete (on my machine): 14s

[codecov]

Codecov Report

Merging #97 (dbb6455) into master (30dcff2) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #97   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           22        22           
  Branches         2         2           
=========================================
  Hits            22        22           

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