Test Method: To Register a Service

The following activity will walk you through the process of registering a mock service in a test class.

Story

Suppose that running a test method leads to the generation of the Autofac.Core.Registration.ComponentNotRegisteredException exception. When this exception occurs, the error message specifies which component (interface) is not registered. You need to register the service that implements the specified interface.

Process Overview

To get rid of the exception, you will add the use of the Autofac library and override the TestBase.RegisterServices method in the test class. In the overridden RegisterServices method, you will register the needed service that implements the interface specified in the exception message.

System Preparation

Before you begin implementing the registration of a service, do the following:

Make sure that you have performed the Test Instance for Unit Testing: To Deploy an Instance prerequisite activity to prepare the MYOB Acumatica instance that you will use.
Make sure that you have performed the Test Project and Test Class: To Create a Test Project prerequisite activity to create and configure the PhoneRepairShop_Code.Tests.csproj test project.
Create the InventoryItemMaintTests test class. For an example that shows how to create a test class, see Test Project and Test Class: To Create a Test Class.
Make sure that you have performed the Test Method: To Create a Test Method with Parameters prerequisite activity to create the RepairItemTypeEnabled_WhenRepairItemSelected test method.
Run the RepairItemTypeEnabled_WhenRepairItemSelected test method.

Step: Registering a Service

When the test method created in Test Method: To Create a Test Method with Parameters is run, the following error message is generated if a proper service is not registered (only part of the error message is quoted).

Autofac.Core.Registration.ComponentNotRegisteredException : The requested service 'System.Func`2[[PX.Data.PXGraph, PX.Data, Version=1.0.0.0, Culture=neutral, PublicKeyToken=3b136cac2f602b8e],[PX.Objects.CM.Extensions.IPXCurrencyService, PX.Objects, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' has not been registered. To avoid this exception, either register a component to provide the service, check for service registration using IsRegistered(), or use the ResolveOptional() method to resolve an optional dependency.

To register this service, do the following:

In the PhoneRepairShop_Code.Tests.csproj project, add a reference to Autofac.dll, or install the Autofac NuGet package. Both procedures are described in Test Project and Test Class: To Create a Test Project.
Add the following using directives to the InventoryItemMaintTests.cs file.
```
using Autofac;
using PX.Objects.CM.Extensions;
```

In the InventoryItemMaintTests class, override the TestBase.RegisterServices method as follows.

        protected override void RegisterServices(ContainerBuilder builder)
        {
            base.RegisterServices(builder);
            builder.RegisterType<PX.Objects.Unit.CurrencyServiceMock>().
                As<IPXCurrencyService>();
        }

After the service is registered, run the tests for the RepairItemTypeEnabled_WhenRepairItemSelected test method, which had failed previously. Make sure that the tests succeed.