diff --git a/day1/day1.jl b/day1/day1.jl
index 2af4a0b..4ce2e45 100644
--- a/day1/day1.jl
+++ b/day1/day1.jl
@@ -1,30 +1,48 @@
 #!/usr/bin/env julia
 
-infile = size(ARGS, 1) > 0 ? ARGS[1] : "day1input.txt"
-Ns = size(ARGS, 1) > 1 ? ARGS[2] : "1"
-println("infile = ", infile)
+using Test
 
-N = parse(Int64, Ns)
+function elf_max_calories(infile)
+  max_calories = zeros(Int64, 3)
+  elf_calories = 0
 
-max_calories = zeros(Int64, N)
-elf_calories = 0
-i = 1
-
-io = open(infile, "r")
-for line in eachline(io)
-  global i, max_calories, max_elf_idx, elf_calories
-  if length(line) == 0
+  open(infile, "r") do io
+    for line in eachline(io)
+      if length(line) == 0
+        if elf_calories > max_calories[1]
+          max_calories[1] = elf_calories
+          sort!(max_calories)
+        end
+        elf_calories = 0
+        continue
+      end
+      snack_calories = parse(Int64, line)
+      elf_calories += snack_calories
+    end
     if elf_calories > max_calories[1]
       max_calories[1] = elf_calories
       sort!(max_calories)
     end
-    i += 1
-    elf_calories = 0
-    continue
   end
-  snack_calories = parse(Int64, line)
-  elf_calories += snack_calories
+
+  return (max_calories[end], sum(max_calories))
+end
+
+function test()
+  @testset "elf snacks" verbose=true begin
+    @test elf_max_calories("example.txt") == (24000, 45000)
+    @test elf_max_calories("input.txt") == (69206, 197400)
+  end
+end
+
+function main()
+  if size(ARGS, 1) == 0
+    test()
+  else
+    infile = ARGS[1]
+    println("infile = ", infile)
+    println("snack calories: ", elf_max_calories(infile))
+  end
 end
 
-println(max_calories)
-println(sum(max_calories))
+main()
diff --git a/day1/day1input.txt b/day1/input.txt
similarity index 100%
rename from day1/day1input.txt
rename to day1/input.txt
diff --git a/day1/src/main.rs b/day1/src/main.rs
index ca414eb..6d14dad 100644
--- a/day1/src/main.rs
+++ b/day1/src/main.rs
@@ -46,13 +46,13 @@ where P: AsRef<Path>, {
 }
 
 fn main() {
-    aoc_day1("day1input.txt", 1);
+    aoc_day1("input.txt", 1);
 }
 
 #[test]
 fn day1input() {
-    assert_eq!(aoc_day1("day1input.txt", 1), 69206);
-    assert_eq!(aoc_day1("day1input.txt", 3), 197400);
+    assert_eq!(aoc_day1("input.txt", 1), 69206);
+    assert_eq!(aoc_day1("input.txt", 3), 197400);
 }
 
 #[test]