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Stock Lot Cost Price Scenario
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Imports::

    >>> import datetime
    >>> from dateutil.relativedelta import relativedelta
    >>> from decimal import Decimal
    >>> from operator import attrgetter
    >>> from proteus import Model, Wizard, Report
    >>> from trytond.tests.tools import activate_modules
    >>> from trytond.modules.company.tests.tools import create_company, \
    ...     get_company
    >>> from trytond.modules.account.tests.tools import create_fiscalyear, \
    ...     create_chart, get_accounts, create_tax
    >>> from trytond.modules.account_invoice.tests.tools import \
    ...     set_fiscalyear_invoice_sequences, create_payment_term
    >>> today = datetime.date.today()

Install stock_lot_cost_price::

    >>> config = activate_modules('stock_lot_cost_price')

Create company::

    >>> _ = create_company()
    >>> company = get_company()

Create fiscal year::

    >>> fiscalyear = set_fiscalyear_invoice_sequences(
    ...     create_fiscalyear(company))
    >>> fiscalyear.click('create_period')

Create chart of accounts::

    >>> _ = create_chart(company)
    >>> accounts = get_accounts(company)
    >>> revenue = accounts['revenue']
    >>> expense = accounts['expense']
    >>> cash = accounts['cash']

Create tax::

    >>> tax = create_tax(Decimal('.10'))
    >>> tax.save()

Create parties::

    >>> Party = Model.get('party.party')
    >>> supplier = Party(name='Supplier')
    >>> supplier.save()
    >>> customer = Party(name='Customer')
    >>> customer.save()

Create product::

    >>> ProductUom = Model.get('product.uom')
    >>> unit, = ProductUom.find([('name', '=', 'Unit')])
    >>> ProductTemplate = Model.get('product.template')

    >>> template = ProductTemplate()
    >>> template.name = 'product'
    >>> template.default_uom = unit
    >>> template.type = 'goods'
    >>> template.purchasable = True
    >>> template.salable = True
    >>> template.list_price = Decimal('10')
    >>> template.cost_price_method = 'fixed'
    >>> template.account_expense = expense
    >>> template.account_revenue = revenue
    >>> template.supplier_taxes.append(tax)
    >>> product, = template.products
    >>> product.cost_price = Decimal('5')
    >>> template.save()
    >>> product, = template.products

Create payment term::

    >>> payment_term = create_payment_term()
    >>> payment_term.save()

Create lot::

    >>> Lot = Model.get('stock.lot')
    >>> lot = Lot(number='LS-34')
    >>> lot.product = product
    >>> lot.save()

Create purchase::

    >>> Purchase = Model.get('purchase.purchase')
    >>> PurchaseLine = Model.get('purchase.line')
    >>> purchase = Purchase()
    >>> purchase.party = supplier
    >>> purchase.payment_term = payment_term
    >>> purchase.invoice_method = 'order'
    >>> purchase_line = PurchaseLine()
    >>> purchase.lines.append(purchase_line)
    >>> purchase_line.product = product
    >>> purchase_line.quantity = 2.0
    >>> purchase.click('quote')
    >>> purchase.click('confirm')
    >>> purchase.click('process')

Set lot::

    >>> Move = Model.get('stock.move')
    >>> moves = Move.find([()])
    >>> for move in moves:
    ...  move.lot = lot
    ...  move.save()
    ...  move.click('assign')
    ...  move.click('do')

Check cost price is products cost_price::

    >>> lot.cost_price
    Decimal('5')