def test_create_purchase_order
    # Login as a clerk
    user = users(:clerk_1)
    get_via_redirect '/login'
    assert_redirected_to '/login/login'
    post_via_redirect '/login/login', :user => {:login => user.email, :password => 'secretive' }
    assert_redirected_to '/'

    # Check the units can be changed
    assert user.company.units == 'kg'
    post_via_redirect '/data_entry/update_units', {:units => 'tonne'}
    assert_redirected_to :action => :index
    user.company.reload
    assert user.company.units == 'tonne'

    # You need to scan the response here to find the relevant periods!!!
    period = periods(:period_one)
    category =  categories(:one)
    fishery_profile = fishery_profiles(:fishery_profile_30)
    purchase_order = purchase_orders(:one)
    second_purchase_order = purchase_orders(:two)

    # create new purchase order with zero volume
    xml_http_request :post, "/data_entry/create_purchase_order",:category_id => category.name,:volume  => 0,
    :fishery_profile_id => fishery_profile.name,:period_id => period.name,:po_action =>"create",:overwrite_duplicate =>"false"
    assert_equal "As the volume supplied was 0, the purchase order was not created.", flash.now[:message]

    # create new purchase order with non zero volume
    xml_http_request :post, "/data_entry/create_purchase_order",:category_id => category.name,:volume  => 20,
    :fishery_profile_id => fishery_profile.name,:period_id => period.name,:po_action =>"create",:overwrite_duplicate =>"false"
    assert_select_rjs  :replace_html,'data_entry'
    assert_equal "Purchase order for period #{period.name} created successfully.", flash.now[:message]

    # update purchase order with non zero volume
    xml_http_request :post, "/data_entry/create_purchase_order",:volume  => 40,
    :po_id => purchase_order.id ,:po_action =>"update"
    assert_not_equal purchase_order.volume, PurchaseOrder.find_by_id(purchase_order.id).volume
    assert_equal "Existing purchase order for period #{purchase_order.period.name} updated successfully.", flash.now[:message]

    # update purchase order with volume above 200 tones
    xml_http_request :post, "/data_entry/create_purchase_order",:category_id => category.name,:volume  => 210,
    :po_id => purchase_order.id ,:po_action =>"update"
    assert_not_equal purchase_order.volume, PurchaseOrder.find_by_id(purchase_order.id).volume
    assert_equal "Data for #{period.name.to_s}, #{purchase_order.fishery_profile.name} for category #{category.name} - are you sure 210.0 is entered in metric tonnes?", flash.now[:warnings][0]

     # duplicate the purchase order and set overwrite_duplicate as true with non zero volume
    xml_http_request :post, "/data_entry/create_purchase_order",:category_id => purchase_order.category.name,
    :volume  => 20,:fishery_profile_id => purchase_order.fishery_profile.name, :period_id => purchase_order.periodic_purchase.period.name,
    :po_action =>"create"
    assert_response :success
    xml_http_request :post, "/data_entry/create_purchase_order",:category_id => purchase_order.category.name,
    :volume  => 30,:fishery_profile_id => purchase_order.fishery_profile.name, :period_id => purchase_order.periodic_purchase.period.name,
    :po_action =>"create" ,:overwrite_duplicate =>"true"
    assert_equal 30, PurchaseOrder.find_by_id(purchase_order.id).volume
    assert_equal "Purchase order for period #{purchase_order.periodic_purchase.period.name} created successfully.", flash.now[:message]

    # duplicate the purchase order and set overwrite_duplicate as false
    xml_http_request :post, "/data_entry/create_purchase_order",:category_id => purchase_order.category.name,
    :volume  => 40,:fishery_profile_id => purchase_order.fishery_profile.name, :period_id => purchase_order.periodic_purchase.period.name,
    :po_action =>"create"
    assert_response :success
    assert_not_equal 40.0, PurchaseOrder.find_by_id(purchase_order.id).volume

    # duplicate the purchase order and set overwrite_duplicate as true with zero volume
    xml_http_request :post, "/data_entry/create_purchase_order",:category_id => purchase_order.category.name,
    :volume  => 20,:fishery_profile_id => purchase_order.fishery_profile.name, :period_id => purchase_order.periodic_purchase.period.name,
    :po_action =>"create"
    assert_response :success
    xml_http_request :post, "/data_entry/create_purchase_order",:category_id => purchase_order.category.name,
    :volume  => 0,:fishery_profile_id => purchase_order.fishery_profile.name, :period_id => purchase_order.periodic_purchase.period.name,
    :po_action =>"create" ,:overwrite_duplicate =>"true"
    assert_select_rjs :remove, "purchase_order_#{purchase_order.id}"
    assert_equal "As the volume supplied was 0, the purchase order was deleted.", flash.now[:message]

    # update purchase order with zero volume
    xml_http_request :post, "/data_entry/create_purchase_order",:volume  => 0,
    :po_id => second_purchase_order.id ,:po_action =>"update"
    assert_select_rjs :remove, "purchase_order_#{second_purchase_order.id}"
    assert_equal nil, PurchaseOrder.find_by_id(second_purchase_order.id)
    assert_equal "As the volume supplied was 0, the purchase order was deleted.", flash.now[:message]

  end