Fix etl exercise: replaced strings with chars

exercises/etl/runtests.jl

@@ -3,34 +3,34 @@ using Base.Test
 include("etl.jl")
 
 @testset "a single letter" begin
-    input = Dict(1=>["A"])
-    output = Dict("a"=>1)
+    input = Dict(1=>['A'])
+    output = Dict('a'=>1)
     @test transform(input) == output
 end
 
 @testset "single score with multiple letters" begin
-    input = Dict(1=>["A", "E", "I", "O", "U"])
-    output = Dict("a"=>1, "e"=>1, "i"=>1, "o"=>1, "u"=>1)
+    input = Dict(1=>['A', 'E', 'I', 'O', 'U'])
+    output = Dict('a'=>1, 'e'=>1, 'i'=>1, 'o'=>1, 'u'=>1)
     @test transform(input) == output
 end
 
 @testset "multiple scores with multiple letters" begin
-    input = Dict(1=>["A", "E"], 2=>["D", "G"])
-    output = Dict("g"=>2, "e"=>1, "a"=>1, "d"=>2)
+    input = Dict(1=>['A', 'E'], 2=>['D', 'G'])
+    output = Dict('g'=>2, 'e'=>1, 'a'=>1, 'd'=>2)
     @test transform(input) == output
 end
 
 @testset "multiple scores with differing numbers of letters" begin
-    input = Dict(1=>[ "A", "E", "I", "O", "U", "L", "N", "R", "S", "T" ],
-                 2=>[ "D", "G" ], 3=>[ "B", "C", "M", "P" ],
-                 4=>[ "F", "H", "V", "W", "Y" ], 5=>[ "K" ],
-                 8=>[ "J", "X" ], 10=>[ "Q", "Z" ])
-    output = Dict("a"=>1, "b"=>3,  "c"=>3, "d"=>2, "e"=>1,
-                  "f"=>4, "g"=>2,  "h"=>4, "i"=>1, "j"=>8,
-                  "k"=>5, "l"=>1,  "m"=>3, "n"=>1, "o"=>1,
-                  "p"=>3, "q"=>10, "r"=>1, "s"=>1, "t"=>1,
-                  "u"=>1, "v"=>4,  "w"=>4, "x"=>8, "y"=>4,
-                  "z"=>10)
+    input = Dict(1=>[ 'A', 'E', 'I', 'O', 'U', 'L', 'N', 'R', 'S', 'T' ],
+                 2=>[ 'D', 'G' ], 3=>[ 'B', 'C', 'M', 'P' ],
+                 4=>[ 'F', 'H', 'V', 'W', 'Y' ], 5=>[ 'K' ],
+                 8=>[ 'J', 'X' ], 10=>[ 'Q', 'Z' ])
+    output = Dict('a'=>1, 'b'=>3,  'c'=>3, 'd'=>2, 'e'=>1,
+                  'f'=>4, 'g'=>2,  'h'=>4, 'i'=>1, 'j'=>8,
+                  'k'=>5, 'l'=>1,  'm'=>3, 'n'=>1, 'o'=>1,
+                  'p'=>3, 'q'=>10, 'r'=>1, 's'=>1, 't'=>1,
+                  'u'=>1, 'v'=>4,  'w'=>4, 'x'=>8, 'y'=>4,
+                  'z'=>10)
     @test transform(input) == output
 end