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  In order to test the inventory, I create a new product
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  !record {model: product.product, id: inventory_product}:
    name: inventory prod
    type: product
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  I create an inventory for this product only
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  !record {model: stock.inventory, id: inventory_test0}:
    name: Test
    product_id: inventory_product
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  I confirm the inventory and check that my inventory has no line, as the product is a new one.
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  !python {model: stock.inventory}: |
    self.prepare_inventory(cr, uid, [ref('inventory_test0')], context=context)
    inv = self.browse(cr, uid, ref('inventory_test0'), context=context)
    assert len(inv.line_ids) == 0, "Wrong number of inventory lines."
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  I add an inventory line and say i have 10 products in stock
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  !record {model: stock.inventory.line, id: inventory_testline0}:
    inventory_id: stock.inventory_test0
    product_uom_id: product.product_uom_unit
    product_id: inventory_product
    product_qty: 10
    location_id: stock.stock_location_14
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  I Validate this inventory
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  !python {model: stock.inventory}: |
    self.action_done(cr, uid, [ref('inventory_test0')], context=context)
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  I check that this inventory has a stock.move and a quant
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  !python {model: stock.inventory}: |
    inv = self.browse(cr, uid, ref('inventory_test0'), context=context)
    assert len(inv.move_ids) >= 1, "No move created for the inventory."
    assert len(inv.move_ids[0].quant_ids) >= 1, "No quant created for this inventory"
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  I check that the quantity on hand is 10 on the location and its parent.
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  !python {model: product.product}: |
    context['location'] = ref('stock.stock_location_14')
    product = self.browse(cr, uid, ref('inventory_product'), context=context)
    assert product.qty_available == 10, 'Expecting 10 products, got %.2f on location stock_location_14!' % (product.qty_available,)
    context['location'] = ref('stock.stock_location_stock')
    product = self.browse(cr, uid, ref('inventory_product'), context=context)
    assert product.qty_available == 10, 'Expecting 10 products, got %.2f on location stock_location_stock!' % (product.qty_available,)
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  I check that the quantity on hand is 0 on a brother location
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  !python {model: product.product}: |
    context['location'] = ref('stock.stock_location_components')
    product = self.browse(cr, uid, ref('inventory_product'), context=context)
    assert product.qty_available == 0, 'Expecting 0 products, got %.2f on location stock_location_components!' % (product.qty_available,)
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  I create another inventory
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  !record {model: stock.inventory, id: inventory_test1}:
    name: second test inventory 
    product_id: inventory_product
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  I confirm the inventory and check that my inventory has one line, with a quantity of 10.
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  !python {model: stock.inventory}: |
    self.prepare_inventory(cr, uid, [ref('inventory_test1')], context=context)
    inv = self.browse(cr, uid, ref('inventory_test1'), context=context)
    assert inv.line_ids and len(inv.line_ids) == 1, "Wrong number of inventory lines."
    assert inv.line_ids[0].product_qty == 10, "Wrong quantity in inventory line."
    assert inv.line_ids[0].product_id.id == ref('inventory_product'), "Wrong product in inventory line."
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  I modify the inventory line and set the quantity to 20 product on this new inventory
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  !python {model: stock.inventory}: |
    inv = self.browse(cr, uid, ref('inventory_test1'), context=context)
    self.pool.get('stock.inventory.line').write(cr, uid, inv.line_ids[0].id, {'product_qty': 20})
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  I Validate this inventory
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  !python {model: stock.inventory}: |
    self.action_done(cr, uid, [ref('inventory_test1')], context=context)
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  I check that the quantity on hand is 20 on the location and it's parent.
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  !python {model: product.product}: |
    context['location'] = ref('stock.stock_location_14')
    product = self.browse(cr, uid, ref('inventory_product'), context=context)
    assert product.qty_available == 20, 'Expecting 20 products, got %.2f on location stock_location_14!' % (product.qty_available,)