Filter reports by last 3 months by default

The values are not shown on the screen and the user doesn't know which
default dates are applied but the filtering works.

app/views/admin/reports/_date_range_form.html.haml

@@ -1,8 +1,8 @@
 -# Field used for ransack search. This date range is mostly used for Spree::Order
 -# so default field is 'completed_at'
 - field ||= 'completed_at'
-- start_date ||= params[:q].try(:[], :completed_at_gt)
-- end_date ||= params[:q].try(:[], :completed_at_lt)
+- start_date ||= params[:q].try(:[], :completed_at_gt) || 3.months.ago.beginning_of_day
+- end_date ||= params[:q].try(:[], :completed_at_lt) || Time.zone.tomorrow.beginning_of_day
 
 .row.date-range-filter
   .alpha.two.columns= label_tag nil, t(:date_range)

spec/system/admin/reports/customers_report_spec.rb

@@ -5,8 +5,11 @@ require "system_helper"
 RSpec.describe "Customers report" do
   include AuthenticationHelper
 
+  let(:enterprise_user) { create(:enterprise_user) }
+  let(:distributor) { enterprise_user.enterprises[0] }
+
   it "can be rendered" do
-    login_as_admin
+    login_as enterprise_user
     visit admin_reports_path
 
     within "table.index" do
@@ -24,4 +27,24 @@ RSpec.describe "Customers report" do
       ]
     )
   end
+
+  it "displays filtered data by default" do
+    old_order = create(
+      :completed_order_with_totals, distributor:, completed_at: 4.months.ago
+    )
+    new_order = create(:completed_order_with_totals, distributor:)
+    future_order = create(
+      :completed_order_with_totals, distributor:, completed_at: 1.day.from_now
+    )
+
+    login_as enterprise_user
+    visit admin_report_path(report_type: :customers)
+    run_report
+
+    rows = find("table.report__table").all("tbody tr")
+    expect(rows.count).to eq 1
+    expect(rows[0].all("td")[3].text).to eq new_order.email
+    expect(page).not_to have_content old_order.email
+    expect(page).not_to have_content future_order.email
+  end
 end