Allow user to add buy and sell trade transactions for investment accounts (#1066)

* Consolidate modal form structure into partial + helper

* Scaffold out trade transaction form

* Normalize translations

* Add buy and sell trade form with tests

* Move entryable lists to dedicated controllers

* Delegate entry group contents rendering

* More cleanup

* Extract transaction and valuation update logic from entries controller

* Delegate edit and show actions to entryables

* Trade builder

* Update paths for transaction updates

test/controllers/account/valuations_controller_test.rb

@@ -0,0 +1,50 @@
+require "test_helper"
+
+class Account::ValuationsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in @user = users(:family_admin)
+    @entry = account_entries :valuation
+  end
+
+  test "should get index" do
+    get account_valuations_url(@entry.account)
+    assert_response :success
+  end
+
+  test "should get new" do
+    get new_account_valuation_url(@entry.account)
+    assert_response :success
+  end
+
+  test "create" do
+    assert_difference [ "Account::Entry.count", "Account::Valuation.count" ], 1 do
+      post account_valuations_url(@entry.account), params: {
+        account_entry: {
+          name: "Manual valuation",
+          amount: 19800,
+          date: Date.current,
+          currency: "USD"
+        }
+      }
+    end
+
+    assert_equal "Valuation created successfully.", flash[:notice]
+    assert_enqueued_with job: AccountSyncJob
+    assert_redirected_to account_valuations_path(@entry.account)
+  end
+
+  test "error when valuation already exists for date" do
+    assert_no_difference [ "Account::Entry.count", "Account::Valuation.count" ] do
+      post account_valuations_url(@entry.account), params: {
+        account_entry: {
+          amount: 19800,
+          date: @entry.date,
+          currency: "USD"
+        }
+      }
+    end
+
+    assert_equal "Date has already been taken", flash[:alert]
+    assert_redirected_to account_path(@entry.account)
+  end
+end