basic admin endgame view and add

test/chesstrainer/tags_test.exs

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+defmodule Chesstrainer.TagsTest do
+  use Chesstrainer.DataCase
+
+  alias Chesstrainer.Tags
+
+  describe "tags" do
+    alias Chesstrainer.Tags.Tag
+
+    import Chesstrainer.TagsFixtures
+
+    @invalid_attrs %{name: nil, category: nil}
+
+    test "list_tags/0 returns all tags" do
+      tag = tag_fixture()
+      assert Tags.list_tags() == [tag]
+    end
+
+    test "get_tag!/1 returns the tag with given id" do
+      tag = tag_fixture()
+      assert Tags.get_tag!(tag.id) == tag
+    end
+
+    test "create_tag/1 with valid data creates a tag" do
+      valid_attrs = %{name: "some name", category: "some category"}
+
+      assert {:ok, %Tag{} = tag} = Tags.create_tag(valid_attrs)
+      assert tag.name == "some name"
+      assert tag.category == "some category"
+    end
+
+    test "create_tag/1 with invalid data returns error changeset" do
+      assert {:error, %Ecto.Changeset{}} = Tags.create_tag(@invalid_attrs)
+    end
+
+    test "update_tag/2 with valid data updates the tag" do
+      tag = tag_fixture()
+      update_attrs = %{name: "some updated name", category: "some updated category"}
+
+      assert {:ok, %Tag{} = tag} = Tags.update_tag(tag, update_attrs)
+      assert tag.name == "some updated name"
+      assert tag.category == "some updated category"
+    end
+
+    test "update_tag/2 with invalid data returns error changeset" do
+      tag = tag_fixture()
+      assert {:error, %Ecto.Changeset{}} = Tags.update_tag(tag, @invalid_attrs)
+      assert tag == Tags.get_tag!(tag.id)
+    end
+
+    test "delete_tag/1 deletes the tag" do
+      tag = tag_fixture()
+      assert {:ok, %Tag{}} = Tags.delete_tag(tag)
+      assert_raise Ecto.NoResultsError, fn -> Tags.get_tag!(tag.id) end
+    end
+
+    test "change_tag/1 returns a tag changeset" do
+      tag = tag_fixture()
+      assert %Ecto.Changeset{} = Tags.change_tag(tag)
+    end
+  end
+end