feat(ntfy): add ntfy fields to admin_users and ntfy_configured? method

test/models/admin_user_test.rb

@@ -1,7 +1,41 @@
 require "test_helper"
 
 class AdminUserTest < ActiveSupport::TestCase
-  # test "the truth" do
-  #   assert true
-  # end
+  test "email is normalized to lowercase and stripped before save" do
+    user = AdminUser.create!(name: "Jane", email: "  Jane@Example.COM  ", password: "supersecret123")
+    assert_equal "jane@example.com", user.email
+  end
+
+  test "email uniqueness is case-insensitive" do
+    AdminUser.create!(name: "First", email: "user@example.com", password: "supersecret123")
+    dup = AdminUser.new(name: "Second", email: "USER@example.com", password: "supersecret123")
+    assert_not dup.valid?
+    assert_includes dup.errors[:email], "has already been taken"
+  end
+
+  test "password must be at least 8 characters when present" do
+    user = AdminUser.new(name: "Short", email: "short@example.com", password: "1234567")
+    assert_not user.valid?
+    assert_includes user.errors[:password], "is too short (minimum is 8 characters)"
+  end
+
+  test "authenticate returns the user with a valid password" do
+    user = AdminUser.create!(name: "Auth", email: "auth@example.com", password: "supersecret123")
+    assert_equal user, user.authenticate("supersecret123")
+    assert_not user.authenticate("wrong")
+  end
+
+  test "ntfy_configured? returns true only when topic and token and enabled are set" do
+    admin = AdminUser.new(name: "N", email: "n@e.com", password: "password123")
+    assert_not admin.ntfy_configured?
+
+    admin.ntfy_enabled = true
+    assert_not admin.ntfy_configured?
+
+    admin.ntfy_topic = "my-topic"
+    assert_not admin.ntfy_configured?
+
+    admin.ntfy_token = "tk_abc"
+    assert admin.ntfy_configured?
+  end
 end