Add Interactive Brokers Provider (#1722)

* Display multi-currency holdings correctly

* Implement IBKR provider

* Fix: Use historical exchange rate for historical prices

* Add brokerage exchange rate for trades

* Sync historical balances from IBKR

* Add logos in activity history

* Fix privacy mode blur in account view

* Improve IBKR XML Flex report parser errors

test/models/transaction/activity_security_preloader_test.rb

@@ -0,0 +1,28 @@
+require "test_helper"
+
+class Transaction::ActivitySecurityPreloaderTest < ActiveSupport::TestCase
+  test "preloads activity securities for transactions" do
+    transaction = Transaction.new(extra: { "security_id" => securities(:aapl).id })
+
+    Transaction::ActivitySecurityPreloader.new([ transaction ]).preload
+
+    assert_equal securities(:aapl), transaction.activity_security
+  end
+
+  test "preloads activity securities for entry collections" do
+    transaction = Transaction.new(extra: { "security_id" => securities(:aapl).id })
+    entry = Entry.new(account: accounts(:depository), entryable: transaction, date: Date.current, name: "Dividend", amount: 10, currency: "USD")
+
+    Transaction::ActivitySecurityPreloader.new([ entry ]).preload
+
+    assert_equal securities(:aapl), transaction.activity_security
+  end
+
+  test "sets nil when the referenced security cannot be found" do
+    transaction = Transaction.new(extra: { "security_id" => SecureRandom.uuid })
+
+    Transaction::ActivitySecurityPreloader.new([ transaction ]).preload
+
+    assert_nil transaction.activity_security
+  end
+end