this is a really good first commit

test/something_erlang_web/live/user_confirmation_live_test.exs

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+defmodule SomethingErlangWeb.UserConfirmationLiveTest do
+  use SomethingErlangWeb.ConnCase
+
+  import Phoenix.LiveViewTest
+  import SomethingErlang.AccountsFixtures
+
+  alias SomethingErlang.Accounts
+  alias SomethingErlang.Repo
+
+  setup do
+    %{user: user_fixture()}
+  end
+
+  describe "Confirm user" do
+    test "renders confirmation page", %{conn: conn} do
+      {:ok, _lv, html} = live(conn, ~p"/users/confirm/some-token")
+      assert html =~ "Confirm Account"
+    end
+
+    test "confirms the given token once", %{conn: conn, user: user} do
+      token =
+        extract_user_token(fn url ->
+          Accounts.deliver_user_confirmation_instructions(user, url)
+        end)
+
+      {:ok, lv, _html} = live(conn, ~p"/users/confirm/#{token}")
+
+      result =
+        lv
+        |> form("#confirmation_form")
+        |> render_submit()
+        |> follow_redirect(conn, "/")
+
+      assert {:ok, conn} = result
+
+      assert Phoenix.Flash.get(conn.assigns.flash, :info) =~
+               "User confirmed successfully"
+
+      assert Accounts.get_user!(user.id).confirmed_at
+      refute get_session(conn, :user_token)
+      assert Repo.all(Accounts.UserToken) == []
+
+      # when not logged in
+      {:ok, lv, _html} = live(conn, ~p"/users/confirm/#{token}")
+
+      result =
+        lv
+        |> form("#confirmation_form")
+        |> render_submit()
+        |> follow_redirect(conn, "/")
+
+      assert {:ok, conn} = result
+
+      assert Phoenix.Flash.get(conn.assigns.flash, :error) =~
+               "User confirmation link is invalid or it has expired"
+
+      # when logged in
+      {:ok, lv, _html} =
+        build_conn()
+        |> log_in_user(user)
+        |> live(~p"/users/confirm/#{token}")
+
+      result =
+        lv
+        |> form("#confirmation_form")
+        |> render_submit()
+        |> follow_redirect(conn, "/")
+
+      assert {:ok, conn} = result
+      refute Phoenix.Flash.get(conn.assigns.flash, :error)
+    end
+
+    test "does not confirm email with invalid token", %{conn: conn, user: user} do
+      {:ok, lv, _html} = live(conn, ~p"/users/confirm/invalid-token")
+
+      {:ok, conn} =
+        lv
+        |> form("#confirmation_form")
+        |> render_submit()
+        |> follow_redirect(conn, ~p"/")
+
+      assert Phoenix.Flash.get(conn.assigns.flash, :error) =~
+               "User confirmation link is invalid or it has expired"
+
+      refute Accounts.get_user!(user.id).confirmed_at
+    end
+  end
+end