add misc tests covering errors, show(), backtracking, and @debug logs

test/misc.jl

@@ -0,0 +1,35 @@
+using Choices
+using Test
+
+function test_error_handling() # and show()
+  ary = ["one", "two", "three"]
+  comp = choose(1,2,5)
+  @test repr(comp) == "(choose from (1, 2, 5))"
+  comp = 
+    comp |> the_number_of_the_counting ->
+    ary[the_number_of_the_counting]
+  @test repr(comp) == "(choose from (1, 2, 5) and call a nontrivial function)"
+  @test_throws BoundsError [comp...] # 5 is right out!
+  cut()
+end
+test_error_handling()
+
+function test_loads_of_backtracking() # and @debug logs
+  comp = choose([[0]])
+  for n ∈ 1:5
+    comp =
+      comp |> ary ->
+      choose(false, true) |> atend ->
+      (atend ? [ary; n] : [n; ary])
+  end
+  comp =
+    comp |> ary -> begin
+      issorted(ary) || fail()
+      ary
+    end
+  answers = []
+  @test_logs (:debug, "considering option") (:debug, "got result") (:debug, "recursing...") (:debug, "returning!") (:debug, "iterating to next option") (:debug, "exhausted options") (:debug, "exhausted all options!") (:debug, "backtracking...") match_mode=:any min_level=Base.CoreLogging.Debug (answers = [comp...])
+  cut()
+  @test answers == [[0,1,2,3,4,5]]
+end
+test_loads_of_backtracking()

test/runtests.jl

@@ -2,3 +2,4 @@ include("razzle-dazzle-root-beer.jl")
 include("rosettacode-amb.jl")
 include("sudoku.jl")
 include("emirp.jl")
+include("misc.jl")