Update: Finished persistable todo server

chapter7/todo_cache/test/test_helper.exs

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+ExUnit.start()

chapter7/todo_cache/test/todo_cache_test.exs

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+defmodule TodoCacheTest do
+  use ExUnit.Case
+
+  test "server_process" do
+    {:ok, cache} = Todo.Cache.start()
+    bob_pid = Todo.Cache.server_process(cache, "bob")
+
+    assert bob_pid != Todo.Cache.server_process(cache, "alice")
+    assert bob_pid == Todo.Cache.server_process(cache, "bob")
+  end
+
+  test "to-do operations" do
+    {:ok, cache} = Todo.Cache.start()
+    alice = Todo.Cache.server_process(cache, "alice")
+
+    Todo.Server.add_entry(alice, %{date: ~D[2020-12-12], title: "Hello"})
+    entries = Todo.Server.entries(alice, ~D[2020-12-12])
+
+    assert [%{date: ~D[2020-12-12], title: "Hello"}] = entries
+  end
+end

chapter7/todo_cache/test/todo_list_test.exs

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+defmodule TodoListTest do
+  use ExUnit.Case, async: true
+
+  test "empty list" do
+    assert Todo.List.size(Todo.List.new()) == 0
+  end
+
+  test "entries" do
+    todo_list =
+      Todo.List.new([
+        %{date: ~D[2018-12-19], title: "Dentist"},
+        %{date: ~D[2018-12-20], title: "Shopping"},
+        %{date: ~D[2018-12-19], title: "Movies"}
+      ])
+
+    assert Todo.List.size(todo_list) == 3
+    assert todo_list |> Todo.List.entries(~D[2018-12-19]) |> length() == 2
+    assert todo_list |> Todo.List.entries(~D[2018-12-20]) |> length() == 1
+    assert todo_list |> Todo.List.entries(~D[2018-12-21]) |> length() == 0
+
+    titles = todo_list |> Todo.List.entries(~D[2018-12-19]) |> Enum.map(& &1.title)
+    assert ["Dentist", "Movies"] = titles
+  end
+
+  test "add_entry" do
+    todo_list =
+      Todo.List.new()
+      |> Todo.List.add_entry(%{date: ~D[2018-12-19], title: "Dentist"})
+      |> Todo.List.add_entry(%{date: ~D[2018-12-20], title: "Shopping"})
+      |> Todo.List.add_entry(%{date: ~D[2018-12-19], title: "Movies"})
+
+    assert Todo.List.size(todo_list) == 3
+    assert todo_list |> Todo.List.entries(~D[2018-12-19]) |> length() == 2
+    assert todo_list |> Todo.List.entries(~D[2018-12-20]) |> length() == 1
+    assert todo_list |> Todo.List.entries(~D[2018-12-21]) |> length() == 0
+
+    titles = todo_list |> Todo.List.entries(~D[2018-12-19]) |> Enum.map(& &1.title)
+    assert ["Dentist", "Movies"] = titles
+  end
+
+  test "update_entry" do
+    todo_list =
+      Todo.List.new()
+      |> Todo.List.add_entry(%{date: ~D[2018-12-19], title: "Dentist"})
+      |> Todo.List.add_entry(%{date: ~D[2018-12-20], title: "Shopping"})
+      |> Todo.List.add_entry(%{date: ~D[2018-12-19], title: "Movies"})
+      |> Todo.List.update_entry(2, &Map.put(&1, :title, "Updated shopping"))
+
+    assert Todo.List.size(todo_list) == 3
+    assert [%{title: "Updated shopping"}] = Todo.List.entries(todo_list, ~D[2018-12-20])
+  end
+
+  test "delete_entry" do
+    todo_list =
+      Todo.List.new()
+      |> Todo.List.add_entry(%{date: ~D[2018-12-19], title: "Dentist"})
+      |> Todo.List.add_entry(%{date: ~D[2018-12-20], title: "Shopping"})
+      |> Todo.List.add_entry(%{date: ~D[2018-12-19], title: "Movies"})
+      |> Todo.List.delete_entry(2)
+
+    assert Todo.List.size(todo_list) == 2
+    assert Todo.List.entries(todo_list, ~D[2018-12-20]) == []
+  end
+end