test: add specs for configure, prepare_page, idempotent settings, and view components

Add 31 new specs bringing line coverage to 100% and branch coverage
from 80.97% to 83.4%. Covers TinyAdmin.configure block form,
Utils#prepare_page, Settings#load_settings idempotency, and unit
specs for FieldValue, Widgets, FiltersForm (all filter types),
and ActionsButtons components.

Author: blocknotes

spec/lib/tiny_admin/settings_idempotent_spec.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require "dummy_rails_app"
+require "rails_helper"
+
+RSpec.describe "Load Settings idempotency" do # rubocop:disable RSpec/DescribeClass
+  let(:settings) { TinyAdmin::Settings.instance }
+
+  around do |example|
+    saved = settings.instance_variable_get(:@options)&.deep_dup
+    saved_store = settings.instance_variable_get(:@store)
+    saved_loaded = settings.instance_variable_get(:@loaded)
+    example.run
+  ensure
+    settings.instance_variable_set(:@options, saved)
+    settings.instance_variable_set(:@store, saved_store)
+    settings.instance_variable_set(:@loaded, saved_loaded)
+  end
+
+  it "does not re-run on subsequent calls" do
+    settings.reset!
+    settings.load_settings
+    store = settings.store
+    settings.load_settings
+    expect(settings.store).to equal(store)
+  end
+
+  it "runs again after reset!" do
+    settings.reset!
+    settings.load_settings
+    store = settings.store
+
+    settings.reset!
+    settings.load_settings
+    expect(settings.store).not_to equal(store)
+  end
+end

spec/lib/tiny_admin/views/components/actions_buttons_spec.rb

@@ -0,0 +1,56 @@
+# frozen_string_literal: true
+
+require "dummy_rails_app"
+require "rails_helper"
+
+RSpec.describe TinyAdmin::Views::Components::ActionsButtons do
+  let(:settings) { TinyAdmin::Settings.instance }
+
+  before { settings.load_settings }
+
+  describe "with no actions" do
+    it "renders an empty nav list", :aggregate_failures do
+      component = described_class.new
+      component.update_attributes(actions: {}, slug: "posts")
+      html = component.call
+      expect(html).to include("nav")
+      expect(html).not_to include("nav-item")
+    end
+  end
+
+  describe "with actions" do
+    let(:action_class) do
+      Class.new do
+        def self.title
+          "Export"
+        end
+      end
+    end
+
+    it "renders action buttons with links", :aggregate_failures do
+      component = described_class.new
+      component.update_attributes(actions: { "export" => action_class }, slug: "posts")
+      html = component.call
+      expect(html).to include("Export")
+      expect(html).to include("export")
+      expect(html).to include("nav-item")
+    end
+
+    it "includes the reference in the URL when provided" do
+      component = described_class.new
+      component.update_attributes(actions: { "export" => action_class }, slug: "posts", reference: "42")
+      html = component.call
+      expect(html).to include("42")
+    end
+  end
+
+  describe "with an action class that does not respond to title" do
+    it "falls back to the action key as label" do
+      action_class = Class.new
+      component = described_class.new
+      component.update_attributes(actions: { "download" => action_class }, slug: "posts")
+      html = component.call
+      expect(html).to include("download")
+    end
+  end
+end