Add headings step to budget creation

Co-Authored-By: decabeza <alberto@decabeza.es>

spec/components/admin/budgets_wizard/headings/group_switcher_component_spec.rb

@@ -0,0 +1,41 @@
+require "rails_helper"
+
+describe Admin::BudgetsWizard::Headings::GroupSwitcherComponent, type: :component do
+  it "is not rendered for budgets with one group" do
+    group = create(:budget_group, budget: create(:budget))
+
+    render_inline Admin::BudgetsWizard::Headings::GroupSwitcherComponent.new(group)
+
+    expect(page.text).to be_empty
+    expect(page).not_to have_css ".budget-group-switcher"
+  end
+
+  it "renders a link to switch group for budgets with two groups" do
+    budget = create(:budget)
+    group = create(:budget_group, budget: budget, name: "Parks")
+    create(:budget_group, budget: budget, name: "Recreation")
+
+    render_inline Admin::BudgetsWizard::Headings::GroupSwitcherComponent.new(group)
+
+    expect(page).to have_content "Showing headings from the Parks group"
+    expect(page).to have_link "Manage headings from the Recreation group."
+    expect(page).not_to have_css "ul"
+  end
+
+  it "renders a menu to switch group for budgets with more than two groups" do
+    budget = create(:budget)
+    group = create(:budget_group, budget: budget, name: "Parks")
+    create(:budget_group, budget: budget, name: "Recreation")
+    create(:budget_group, budget: budget, name: "Entertainment")
+
+    render_inline Admin::BudgetsWizard::Headings::GroupSwitcherComponent.new(group)
+
+    expect(page).to have_content "Showing headings from the Parks group"
+    expect(page).to have_button "Manage headings from a different group"
+
+    within "button + ul" do
+      expect(page).to have_link "Recreation"
+      expect(page).to have_link "Entertainment"
+    end
+  end
+end