old_contents: # -*- coding: utf-8 -*-
  # Copyright (c) 2018, Frappe Technologies Pvt. Ltd. and Contributors
  # See license.txt
  from __future__ import unicode_literals
  
  import frappe
  import unittest
  
  class TestFinanceBook(unittest.TestCase):
  	pass
  
new_contents: # -*- coding: utf-8 -*-
  # Copyright (c) 2018, Frappe Technologies Pvt. Ltd. and Contributors
  # See license.txt
  from __future__ import unicode_literals
  from erpnext.accounts.doctype.journal_entry.test_journal_entry import make_journal_entry
  
  
  import frappe
  import unittest
  
  class TestFinanceBook(unittest.TestCase):
  	def create_finance_book(self):
  		if not frappe.db.exists("Finance Book", "_Test Finance Book"):
  			finance_book = frappe.get_doc({
  				"doctype": "Finance Book",
  				"finance_book_name": "_Test Finance Book"
  			}).insert()
  		else:
  			finance_book = frappe.get_doc("Finance Book", "_Test Finance Book")
  
  		return finance_book
  	
  	def test_finance_book(self):
  		finance_book = self.create_finance_book()
  
  		# create jv entry
  		jv = make_journal_entry("_Test Bank - _TC",
  			"_Test Receivable - _TC", 100, save=False)
  
  		jv.accounts[1].update({
  			"party_type": "Customer",
  			"party": "_Test Customer USD"
  		})
  
  		jv.finance_book = finance_book.finance_book_name
  		jv.submit()
  
  		# check the Finance Book in the GL Entry
  		gl_entries = frappe.get_all("GL Entry", fields=["name", "finance_book"],
  			filters={"voucher_type": "Journal Entry", "voucher_no": jv.name})
  
  		for gl_entry in gl_entries:
  			self.assertEqual(gl_entry.finance_book, finance_book.name)
subject: check the finance book via the journal entry