Account::Sync model and test fixture simplifications (#968)

* Add sync model

* Fresh fixtures for sync tests

* Sync tests overhaul

* Fix entry tests

* Complete remaining model test updates

* Update system tests

* Update demo data task

* Add system tests back to PR checks

* More simplifications, add empty family to fixtures for easier testing

test/support/account/entries_test_helper.rb

@@ -0,0 +1,30 @@
+module Account::EntriesTestHelper
+  def create_transaction(attributes = {})
+    entry_attributes = attributes.except(:category, :tags, :merchant)
+    transaction_attributes = attributes.slice(:category, :tags, :merchant)
+
+    entry_defaults = {
+      account: accounts(:depository),
+      name: "Transaction",
+      date: Date.current,
+      currency: "USD",
+      amount: 100,
+      entryable: Account::Transaction.new(transaction_attributes)
+    }
+
+    Account::Entry.create! entry_defaults.merge(entry_attributes)
+  end
+
+  def create_valuation(attributes = {})
+    entry_defaults = {
+      account: accounts(:depository),
+      name: "Valuation",
+      date: 1.day.ago.to_date,
+      currency: "USD",
+      amount: 5000,
+      entryable: Account::Valuation.new
+    }
+
+    Account::Entry.create! entry_defaults.merge(attributes)
+  end
+end