bottle_song

elixir/bottle-song/test/bottle_song_test.exs

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+defmodule BottleSongTest do
+  use ExUnit.Case
+
+  describe "[Single verse]" do
+    test "First generic verse" do
+      assert BottleSong.recite(10, 1) ==
+               """
+               Ten green bottles hanging on the wall,
+               Ten green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be nine green bottles hanging on the wall.\
+               """
+    end
+
+    test "Last generic verse" do
+      assert BottleSong.recite(3, 1) ==
+               """
+               Three green bottles hanging on the wall,
+               Three green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be two green bottles hanging on the wall.\
+               """
+    end
+
+    test "Verse with 2 bottles" do
+      assert BottleSong.recite(2, 1) ==
+               """
+               Two green bottles hanging on the wall,
+               Two green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be one green bottle hanging on the wall.\
+               """
+    end
+
+    test "Verse with 1 bottle" do
+      assert BottleSong.recite(1, 1) ==
+               """
+               One green bottle hanging on the wall,
+               One green bottle hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be no green bottles hanging on the wall.\
+               """
+    end
+  end
+
+  describe "[Multiple verses]" do
+    test "First two verses" do
+      assert BottleSong.recite(10, 2) ==
+               """
+               Ten green bottles hanging on the wall,
+               Ten green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be nine green bottles hanging on the wall.
+
+               Nine green bottles hanging on the wall,
+               Nine green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be eight green bottles hanging on the wall.\
+               """
+    end
+
+    test "Last three verses" do
+      assert BottleSong.recite(3, 3) ==
+               """
+               Three green bottles hanging on the wall,
+               Three green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be two green bottles hanging on the wall.
+
+               Two green bottles hanging on the wall,
+               Two green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be one green bottle hanging on the wall.
+
+               One green bottle hanging on the wall,
+               One green bottle hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be no green bottles hanging on the wall.\
+               """
+    end
+
+    test "All verses" do
+      assert BottleSong.recite(10, 10) ==
+               """
+               Ten green bottles hanging on the wall,
+               Ten green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be nine green bottles hanging on the wall.
+
+               Nine green bottles hanging on the wall,
+               Nine green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be eight green bottles hanging on the wall.
+
+               Eight green bottles hanging on the wall,
+               Eight green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be seven green bottles hanging on the wall.
+
+               Seven green bottles hanging on the wall,
+               Seven green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be six green bottles hanging on the wall.
+
+               Six green bottles hanging on the wall,
+               Six green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be five green bottles hanging on the wall.
+
+               Five green bottles hanging on the wall,
+               Five green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be four green bottles hanging on the wall.
+
+               Four green bottles hanging on the wall,
+               Four green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be three green bottles hanging on the wall.
+
+               Three green bottles hanging on the wall,
+               Three green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be two green bottles hanging on the wall.
+
+               Two green bottles hanging on the wall,
+               Two green bottles hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be one green bottle hanging on the wall.
+
+               One green bottle hanging on the wall,
+               One green bottle hanging on the wall,
+               And if one green bottle should accidentally fall,
+               There'll be no green bottles hanging on the wall.\
+               """
+    end
+  end
+end

elixir/bottle-song/test/test_helper.exs

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+ExUnit.start()
+ExUnit.configure(exclude: :pending, trace: true)