test(recurring): prove export roundtrip semantics (#1727)

* test(recurring): prove export roundtrip semantics

* test(recurring): assert export roundtrip payload

test/models/family/data_importer_test.rb

@@ -313,6 +313,85 @@ class Family::DataImporterTest < ActiveSupport::TestCase
     assert_equal(-89.99, recurring_transaction.expected_amount_avg.to_f)
   end
 
+  test "round trips recurring transaction export semantics" do
+    source_family = Family.create!(name: "Recurring Source", currency: "USD")
+    source_account = source_family.accounts.create!(
+      name: "Source Checking",
+      accountable: Depository.new,
+      balance: 1000,
+      currency: "USD"
+    )
+    source_merchant = source_family.merchants.create!(name: "Internet Provider")
+
+    source_family.recurring_transactions.create!(
+      account: source_account,
+      merchant: source_merchant,
+      amount: -89.99,
+      currency: "USD",
+      expected_day_of_month: 14,
+      last_occurrence_date: Date.parse("2024-01-14"),
+      next_expected_date: Date.parse("2024-02-14"),
+      status: "active",
+      occurrence_count: 6,
+      manual: true,
+      expected_amount_min: -95,
+      expected_amount_max: -85,
+      expected_amount_avg: -89.99
+    )
+
+    source_family.recurring_transactions.create!(
+      name: "Quarterly Insurance",
+      amount: 240,
+      currency: "USD",
+      expected_day_of_month: 28,
+      last_occurrence_date: Date.parse("2024-01-28"),
+      next_expected_date: Date.parse("2024-04-28"),
+      status: "inactive",
+      occurrence_count: 2,
+      manual: false
+    )
+
+    ndjson = nil
+    Zip::File.open_buffer(Family::DataExporter.new(source_family).generate_export) do |zip|
+      ndjson = zip.read("all.ndjson")
+    end
+
+    assert_not_nil ndjson
+    assert ndjson.include?('"type":"RecurringTransaction"')
+
+    Family::DataImporter.new(@family, ndjson).import!
+
+    assert_equal 2, @family.recurring_transactions.count
+
+    restored_account = @family.accounts.find_by!(name: "Source Checking")
+    restored_merchant = @family.merchants.find_by!(name: "Internet Provider")
+    restored_provider = @family.recurring_transactions.find_by!(merchant: restored_merchant)
+
+    assert_equal restored_account, restored_provider.account
+    assert_equal(-89.99, restored_provider.amount.to_f)
+    assert_equal "USD", restored_provider.currency
+    assert_equal 14, restored_provider.expected_day_of_month
+    assert_equal Date.parse("2024-01-14"), restored_provider.last_occurrence_date
+    assert_equal Date.parse("2024-02-14"), restored_provider.next_expected_date
+    assert_equal "active", restored_provider.status
+    assert_equal 6, restored_provider.occurrence_count
+    assert_equal true, restored_provider.manual
+    assert_equal(-95.0, restored_provider.expected_amount_min.to_f)
+    assert_equal(-85.0, restored_provider.expected_amount_max.to_f)
+    assert_equal(-89.99, restored_provider.expected_amount_avg.to_f)
+
+    restored_named = @family.recurring_transactions.find_by!(name: "Quarterly Insurance")
+    assert_nil restored_named.account
+    assert_nil restored_named.merchant
+    assert_equal 240.0, restored_named.amount.to_f
+    assert_equal 28, restored_named.expected_day_of_month
+    assert_equal Date.parse("2024-01-28"), restored_named.last_occurrence_date
+    assert_equal Date.parse("2024-04-28"), restored_named.next_expected_date
+    assert_equal "inactive", restored_named.status
+    assert_equal 2, restored_named.occurrence_count
+    assert_equal false, restored_named.manual
+  end
+
   test "imports recurring transactions with unknown status fallback" do
     ndjson = build_ndjson([
       {