diff --git a/app/models/bank_transaction.rb b/app/models/bank_transaction.rb
index bd437fe96..f5c31c964 100644
--- a/app/models/bank_transaction.rb
+++ b/app/models/bank_transaction.rb
@@ -8,6 +8,14 @@ class BankTransaction < ApplicationRecord
     where('id NOT IN (SELECT bank_transaction_id FROM account_activities where bank_transaction_id IS NOT NULL)')
   }
 
+  def self.ransackable_associations(auth_object = nil)
+    super
+  end
+
+  def self.ransackable_attributes(auth_object = nil)
+    super
+  end
+
   def binded?
     account_activity.present?
   end
diff --git a/test/models/invoice_test.rb b/test/models/invoice_test.rb
index 344af9dcc..586f467a8 100644
--- a/test/models/invoice_test.rb
+++ b/test/models/invoice_test.rb
@@ -51,12 +51,9 @@ class InvoiceTest < ActiveSupport::TestCase
   end
 
   def test_calculates_subtotal
-    line_item = InvoiceItem.new
-    invoice = Invoice.new(items: [line_item, line_item])
-
-    line_item.stub(:item_sum_without_vat, BigDecimal('2.5')) do
-      assert_equal BigDecimal(5), invoice.subtotal
-    end
+    line_item = InvoiceItem.new(price: BigDecimal('2.5'), quantity: 1)
+    invoice = Invoice.new(items: [line_item, line_item.dup])
+    assert_equal BigDecimal(5), invoice.subtotal
   end
 
   def test_returns_persisted_total
@@ -64,14 +61,10 @@ class InvoiceTest < ActiveSupport::TestCase
   end
 
   def test_calculates_total
-    line_item = InvoiceItem.new
-    invoice = Invoice.new
-    invoice.vat_rate = 10
-    invoice.items = [line_item, line_item]
-
-    line_item.stub(:item_sum_without_vat, BigDecimal('2.5')) do
-      assert_equal BigDecimal('5.50'), invoice.total
-    end
+    line_item = InvoiceItem.new(price: BigDecimal('2.5'), quantity: 1)
+    invoice = Invoice.new(vat_rate: 10)
+    invoice.items = [line_item, line_item.dup]
+    assert_equal BigDecimal('5.50'), invoice.total
   end
 
   def test_valid_without_buyer_vat_no