Code:

move = self.env['account.move'].create({

'move_type': 'in_invoice',

'date': '2017-01-01',

'partner_id': self.partner_a.id,

'invoice_date': fields.Date.from_string('2017-01-01'),

'currency_id': self.currency_data['currency'].id,

'invoice_payment_term_id': self.pay_terms_a.id,

'invoice_line_ids': [

(0, None, {

'name': self.product_line_vals_1['name'],

'product_id': self.product_line_vals_1['product_id'],

'product_uom_id': self.product_line_vals_1['product_uom_id'],

'quantity': self.product_line_vals_1['quantity'],

'price_unit': self.product_line_vals_1['price_unit'],

'tax_ids': self.product_line_vals_1['tax_ids'],

}),

(0, None, {

'name': self.product_line_vals_2['name'],

'product_id': self.product_line_vals_2['product_id'],

'product_uom_id': self.product_line_vals_2['product_uom_id'],

'quantity': self.product_line_vals_2['quantity'],

'price_unit': self.product_line_vals_2['price_unit'],

'tax_ids': self.product_line_vals_2['tax_ids'],

}),

]

})