city-office & high-score

elixir/high-score/test/high_score_test.exs

@@ -0,0 +1,186 @@
+defmodule HighScoreTest do
+  use ExUnit.Case
+
+  # Trivia: Scores used in this test suite are based on lines of code
+  # added to the elixir-lang/elixir github repository as of Apr 27, 2020.
+
+  @tag task_id: 1
+  test "new/1 result in empty score map" do
+    assert HighScore.new() == %{}
+  end
+
+  describe "add_player/2" do
+    @tag task_id: 2
+    test "add player without score to empty score map" do
+      scores = HighScore.new()
+
+      assert HighScore.add_player(scores, "José Valim") == %{"José Valim" => 0}
+    end
+
+    @tag task_id: 2
+    test "add two players without score to empty map" do
+      scores =
+        HighScore.new()
+        |> HighScore.add_player("José Valim")
+        |> HighScore.add_player("Chris McCord")
+
+      assert scores == %{"Chris McCord" => 0, "José Valim" => 0}
+    end
+
+    @tag task_id: 2
+    test "add player with score to empty score map" do
+      scores =
+        HighScore.new()
+        |> HighScore.add_player("José Valim", 486_373)
+
+      assert scores == %{"José Valim" => 486_373}
+    end
+
+    @tag task_id: 2
+    test "add players with scores to empty score map" do
+      scores =
+        HighScore.new()
+        |> HighScore.add_player("José Valim", 486_373)
+        |> HighScore.add_player("Dave Thomas", 2_374)
+
+      assert scores == %{"José Valim" => 486_373, "Dave Thomas" => 2_374}
+    end
+  end
+
+  describe "remove_player/2" do
+    @tag task_id: 3
+    test "remove from empty score map results in empty score map" do
+      scores =
+        HighScore.new()
+        |> HighScore.remove_player("José Valim")
+
+      assert scores == %{}
+    end
+
+    @tag task_id: 3
+    test "remove player after adding results in empty score map" do
+      map =
+        HighScore.new()
+        |> HighScore.add_player("José Valim")
+        |> HighScore.remove_player("José Valim")
+
+      assert map == %{}
+    end
+
+    @tag task_id: 3
+    test "remove first player after adding two results in map with remaining player" do
+      scores =
+        HighScore.new()
+        |> HighScore.add_player("José Valim")
+        |> HighScore.add_player("Chris McCord")
+        |> HighScore.remove_player("José Valim")
+
+      assert scores == %{"Chris McCord" => 0}
+    end
+
+    @tag task_id: 3
+    test "remove second player after adding two results in map with remaining player" do
+      scores =
+        HighScore.new()
+        |> HighScore.add_player("José Valim")
+        |> HighScore.add_player("Chris McCord")
+        |> HighScore.remove_player("Chris McCord")
+
+      assert scores == %{"José Valim" => 0}
+    end
+  end
+
+  describe "reset_score/2" do
+    @tag task_id: 4
+    test "resetting score for non-existent player sets player score to 0" do
+      scores =
+        HighScore.new()
+        |> HighScore.reset_score("José Valim")
+
+      assert scores == %{"José Valim" => 0}
+    end
+
+    @tag task_id: 4
+    test "resetting score for existing player sets previous player score to 0" do
+      scores =
+        HighScore.new()
+        |> HighScore.add_player("José Valim", 486_373)
+        |> HighScore.reset_score("José Valim")
+
+      assert scores == %{"José Valim" => 0}
+    end
+  end
+
+  describe "update_score/3" do
+    @tag task_id: 5
+    test "update score for non existent player initializes value" do
+      scores =
+        HighScore.new()
+        |> HighScore.update_score("José Valim", 486_373)
+
+      assert scores == %{"José Valim" => 486_373}
+    end
+
+    @tag task_id: 5
+    test "update score for existing player adds score to previous" do
+      scores =
+        HighScore.new()
+        |> HighScore.add_player("José Valim")
+        |> HighScore.update_score("José Valim", 486_373)
+
+      assert scores == %{"José Valim" => 486_373}
+    end
+
+    @tag task_id: 5
+    test "update score for existing player with non-zero score adds score to previous" do
+      scores =
+        HighScore.new()
+        |> HighScore.add_player("José Valim")
+        |> HighScore.update_score("José Valim", 1)
+        |> HighScore.update_score("José Valim", 486_373)
+
+      assert scores == %{"José Valim" => 486_374}
+    end
+  end
+
+  describe "get_players/1" do
+    @tag task_id: 6
+    test "empty score map gives empty list" do
+      scores_by_player =
+        HighScore.new()
+        |> HighScore.get_players()
+
+      assert scores_by_player == []
+    end
+
+    @tag task_id: 6
+    test "score map with one entry gives one result" do
+      players =
+        HighScore.new()
+        |> HighScore.add_player("José Valim")
+        |> HighScore.update_score("José Valim", 486_373)
+        |> HighScore.get_players()
+
+      assert players == ["José Valim"]
+    end
+
+    @tag task_id: 6
+    test "score map with multiple entries gives results in unknown order" do
+      players =
+        HighScore.new()
+        |> HighScore.add_player("José Valim", 486_373)
+        |> HighScore.add_player("Dave Thomas", 2_374)
+        |> HighScore.add_player("Chris McCord", 0)
+        |> HighScore.add_player("Saša Jurić", 762)
+        |> HighScore.get_players()
+        |> Enum.sort()
+
+      assert players == [
+               "Chris McCord",
+               "Dave Thomas",
+               "José Valim",
+               "Saša Jurić"
+             ]
+    end
+  end
+end

elixir/high-score/test/test_helper.exs

@@ -0,0 +1,2 @@
+ExUnit.start()
+ExUnit.configure(exclude: :pending, trace: true, seed: 0)