Data exports (#2517)

* Import / export UI

* Data exports

* Lint fixes, brakeman update

test/models/family/data_exporter_test.rb

@@ -0,0 +1,115 @@
+require "test_helper"
+
+class Family::DataExporterTest < ActiveSupport::TestCase
+  setup do
+    @family = families(:dylan_family)
+    @other_family = families(:empty)
+    @exporter = Family::DataExporter.new(@family)
+
+    # Create some test data for the family
+    @account = @family.accounts.create!(
+      name: "Test Account",
+      accountable: Depository.new,
+      balance: 1000,
+      currency: "USD"
+    )
+
+    @category = @family.categories.create!(
+      name: "Test Category",
+      color: "#FF0000"
+    )
+
+    @tag = @family.tags.create!(
+      name: "Test Tag",
+      color: "#00FF00"
+    )
+  end
+
+  test "generates a zip file with all required files" do
+    zip_data = @exporter.generate_export
+
+    assert zip_data.is_a?(StringIO)
+
+    # Check that the zip contains all expected files
+    expected_files = [ "accounts.csv", "transactions.csv", "trades.csv", "categories.csv", "all.ndjson" ]
+
+    Zip::File.open_buffer(zip_data) do |zip|
+      actual_files = zip.entries.map(&:name)
+      assert_equal expected_files.sort, actual_files.sort
+    end
+  end
+
+  test "generates valid CSV files" do
+    zip_data = @exporter.generate_export
+
+    Zip::File.open_buffer(zip_data) do |zip|
+      # Check accounts.csv
+      accounts_csv = zip.read("accounts.csv")
+      assert accounts_csv.include?("id,name,type,subtype,balance,currency,created_at")
+
+      # Check transactions.csv
+      transactions_csv = zip.read("transactions.csv")
+      assert transactions_csv.include?("date,account_name,amount,name,category,tags,notes,currency")
+
+      # Check trades.csv
+      trades_csv = zip.read("trades.csv")
+      assert trades_csv.include?("date,account_name,ticker,quantity,price,amount,currency")
+
+      # Check categories.csv
+      categories_csv = zip.read("categories.csv")
+      assert categories_csv.include?("name,color,parent_category,classification")
+    end
+  end
+
+  test "generates valid NDJSON file" do
+    zip_data = @exporter.generate_export
+
+    Zip::File.open_buffer(zip_data) do |zip|
+      ndjson_content = zip.read("all.ndjson")
+      lines = ndjson_content.split("\n")
+
+      lines.each do |line|
+        assert_nothing_raised { JSON.parse(line) }
+      end
+
+      # Check that each line has expected structure
+      first_line = JSON.parse(lines.first)
+      assert first_line.key?("type")
+      assert first_line.key?("data")
+    end
+  end
+
+  test "only exports data from the specified family" do
+    # Create data for another family that should NOT be exported
+    other_account = @other_family.accounts.create!(
+      name: "Other Family Account",
+      accountable: Depository.new,
+      balance: 5000,
+      currency: "USD"
+    )
+
+    other_category = @other_family.categories.create!(
+      name: "Other Family Category",
+      color: "#0000FF"
+    )
+
+    zip_data = @exporter.generate_export
+
+    Zip::File.open_buffer(zip_data) do |zip|
+      # Check accounts.csv doesn't contain other family's data
+      accounts_csv = zip.read("accounts.csv")
+      assert accounts_csv.include?(@account.name)
+      refute accounts_csv.include?(other_account.name)
+
+      # Check categories.csv doesn't contain other family's data
+      categories_csv = zip.read("categories.csv")
+      assert categories_csv.include?(@category.name)
+      refute categories_csv.include?(other_category.name)
+
+      # Check NDJSON doesn't contain other family's data
+      ndjson_content = zip.read("all.ndjson")
+      refute ndjson_content.include?(other_account.id)
+      refute ndjson_content.include?(other_category.id)
+    end
+  end
+end

test/models/family_export_test.rb

@@ -0,0 +1,7 @@
+require "test_helper"
+
+class FamilyExportTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end