Added check for living survivors to game level detection

lib/zombie_survivor/game.ex

@@ -31,6 +31,7 @@ defmodule ZombieSurvivor.Game do
   @spec level(Game.t()) :: ZombieSurvivor.level()
   def level(game) do
     game.survivors
+    |> Enum.reject(fn {_, s} -> Survivor.dead?(s) end)
     |> Enum.reduce(0, fn {_, s}, acc -> max(s.experience, acc) end)
     |> ZombieSurvivor.level()
   end

test/game_test.exs

@@ -100,5 +100,31 @@ defmodule GameTest do
 
       assert Game.level(g) == :red
     end
+
+    test "returns the level of the highest levelled living survivor" do
+      g =
+        Game.new()
+        |> Game.add_survivor(@new_survivor)
+
+      assert Game.level(g) == :blue
+
+      g =
+        g
+        |> Game.add_survivor(Survivor.new(name: "Eric", experience: 10))
+
+      assert Game.level(g) == :yellow
+
+      g =
+        g
+        |> Game.add_survivor(Survivor.new(name: "Jack", experience: 20, wounds: 2))
+
+      assert Game.level(g) == :yellow
+
+      g =
+        g
+        |> Game.add_survivor(Survivor.new(name: "Liru", experience: 1_000_000, wounds: 2))
+
+      assert Game.level(g) == :yellow
+    end
   end
 end