Initial commit

elixir/language-list/test/language_list_test.exs

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+defmodule LanguageListTest do
+  use ExUnit.Case
+
+  describe "new/0" do
+    @tag task_id: 1
+    test "new list" do
+      assert LanguageList.new() == []
+    end
+  end
+
+  describe "add/2" do
+    @tag task_id: 2
+    test "add a language to a list" do
+      language = "Elixir"
+      list = [language]
+
+      assert LanguageList.new() |> LanguageList.add(language) == list
+    end
+
+    @tag task_id: 2
+    test "add several languages to a list" do
+      list =
+        LanguageList.new()
+        |> LanguageList.add("Clojure")
+        |> LanguageList.add("Haskell")
+        |> LanguageList.add("Erlang")
+        |> LanguageList.add("F#")
+        |> LanguageList.add("Elixir")
+
+      assert list == ["Elixir", "F#", "Erlang", "Haskell", "Clojure"]
+    end
+  end
+
+  describe "remove/1" do
+    @tag task_id: 3
+    test "add then remove results in empty list" do
+      list =
+        LanguageList.new()
+        |> LanguageList.add("Elixir")
+        |> LanguageList.remove()
+
+      assert list == []
+    end
+
+    @tag task_id: 3
+    test "adding two languages, when removed, removes first item" do
+      list =
+        LanguageList.new()
+        |> LanguageList.add("F#")
+        |> LanguageList.add("Elixir")
+        |> LanguageList.remove()
+
+      assert list == ["F#"]
+    end
+  end
+
+  describe "first/1" do
+    @tag task_id: 4
+    test "add one language, then get the first" do
+      assert LanguageList.new() |> LanguageList.add("Elixir") |> LanguageList.first() == "Elixir"
+    end
+
+    @tag task_id: 4
+    test "add a few languages, then get the first" do
+      first =
+        LanguageList.new()
+        |> LanguageList.add("Elixir")
+        |> LanguageList.add("Prolog")
+        |> LanguageList.add("F#")
+        |> LanguageList.first()
+
+      assert first == "F#"
+    end
+  end
+
+  describe "count/1" do
+    @tag task_id: 5
+    test "the count of a new list is 0" do
+      assert LanguageList.new() |> LanguageList.count() == 0
+    end
+
+    @tag task_id: 5
+    test "the count of a one-language list is 1" do
+      count =
+        LanguageList.new()
+        |> LanguageList.add("Elixir")
+        |> LanguageList.count()
+
+      assert count == 1
+    end
+
+    @tag task_id: 5
+    test "the count of a multiple-item list is equal to its length" do
+      count =
+        LanguageList.new()
+        |> LanguageList.add("Elixir")
+        |> LanguageList.add("Prolog")
+        |> LanguageList.add("F#")
+        |> LanguageList.count()
+
+      assert count == 3
+    end
+  end
+
+  describe "functional_list?/1" do
+    @tag task_id: 6
+    test "a functional language list" do
+      assert LanguageList.functional_list?(["Clojure", "Haskell", "Erlang", "F#", "Elixir"])
+    end
+
+    @tag task_id: 6
+    test "not a functional language list" do
+      refute LanguageList.functional_list?(["Java", "C", "JavaScript"])
+    end
+  end
+end

elixir/language-list/test/test_helper.exs

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+ExUnit.start()
+ExUnit.configure(exclude: :pending, trace: true, seed: 0)