Install (Install\tests\Install)
 [x] Permissions
 [x] Invalid install request
 [x] Invalid database install request
 [x] Install

Admin (Modules\Billing\tests\Admin\Admin)
 [x] Module integration
 [x] Members
 [x] Valid mapper
 [x] Mapper against model
 [x] Valid db schema
 [x] Db schema against db
 [x] Mapper against db schema
 [x] Json
 [x] Dependency
 [x] Routes
 [x] Hooks
 [x] Navigation
 [x] Request loads
 [x] Language

Modules\tests\Billing\Controller\ApiControllerTest: Billing api controller
 [x] Bill create invalid data
 [x] Bill element create invalid data

Bill Element (Modules\Billing\tests\Models\BillElement)
 [x] Default
 [x] Item input output
 [x] Serialize

Bill (Modules\Billing\tests\Models\Bill)
 [x] Default
 [x] Number rendering
 [x] Status input output
 [x] Currency input output
 [x] Voucher input output
 [x] Tracking input output
 [x] Element input output
 [x] Serialize

Bill Type (Modules\Billing\tests\Models\BillType)
 [x] Default
 [x] L 11n input output

Null Bill Element (Modules\Billing\tests\Models\NullBillElement)
 [x] Null
 [x] Id

Null Bill (Modules\Billing\tests\Models\NullBill)
 [x] Null
 [x] Id

Null Bill Type (Modules\Billing\tests\Models\NullBillType)
 [x] Null
 [x] Id

Modules\Billing\tests\Models\PurchaseBillMapperTest: App database mapper
 [x] Get purchase before pivot invalid
 [x] Get purchase after pivot invalid
 [x] Get purchase by item id invalid
 [x] Get purchase by supplier id invalid
 [x] Get avg purchase price by item id invalid
 [x] Get last order date by item id invalid
 [x] Get last order date by supplier id invalid
 [x] Get newest item invoices invalid
 [x] Get newest supplier invoices invalid
 [x] Get item top suppliers invalid
 [x] Get item country purchase invalid
 [x] Get item monthly purchase costs invalid
 [x] Get supplier monthly purchase costs invalid

Modules\Billing\tests\Models\SalesBillMapperTest: App database mapper
 [x] Get sales before pivot invalid
 [x] Get sales after pivot invalid
 [x] Get sales by item id invalid
 [x] Get sales by client id invalid
 [x] Get avg sales price by item id invalid
 [x] Get last order date by item id invalid
 [x] Get last order date by client id invalid
 [x] Get newest item invoices invalid
 [x] Get newest client invoices invalid
 [x] Get item top clients invalid
 [x] Get item bills invalid
 [x] Get client item
 [x] Get item country sales invalid
 [x] Get item monthly sales costs invalid
 [x] Get client monthly sales costs invalid

Modules\Billing\tests\Models\StockBillMapperTest: App database mapper
 [x] Get stock before pivot invalid
 [x] Get stock after pivot invalid