4 Efarchitecture m4 Testing Slides

8/18/2019 4 Efarchitecture m4 Testing Slides

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Entity Framework: Automated Testing

Build Automated Tests for EF-dependent code

Julie Lerman

thedatafarm.com/blog


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Goals

Automated Testing Overview Testing Database Interaction

Testing Entity Framework Integration with your logic

Avoiding EF and the DB with Fakes

Resources


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SystemTesting

InteractionTesting

Automated Testing

UnitTesting

User InterfaceTesting

IntegrationTesting


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Testing Code that Interacts with the Database

My Business Logic

Adds some data tothe database

My Concern

Does it really work?My Test

Run the method

Query the databaseto see if the data isreally there


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But

is it really

a unit test?


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Unit Testing when EF Intrudes

public List OrdersFromAPromotion(Promotion promo)

{

if (promo.StartDate o.PromotionId == promo.PromotionId)

.ToList();

}

return null;}


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Testing for Both Responses

[TestMethod]

public void GetOrdersForPastPromotionsDoesNotSkipQuery()

[TestMethod]public void

GetOrdersForFuturePromotionsSkipsQueryAndReturnsNull()


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public List OrdersViaPromotion(Promotion promo)

{


.ToList();

}

return null;}


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{


.ToList();

}

return null;}

EF Context& Database

Fake Context& Fake Data


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MyCustom FakeDbSet

: IDbSet

Step 1: Abstracting DbSet

System.Data.Entity.

IDbSet

System.Data.Entity.DbSet


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Adding in a Fake IDbSet Implementation

1. Create abstract FakeDbSet : IDbSet Note abstract Find method

2. Derive FakeDbSet

PromotionFakeDbSet

3. Prep existing context classes*

SalesContext


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MyCustom FakeObjectSet

: IObjectSet

Step 1: Abstracting ObjectSet

System.Data.Entity.

IObjectSet

System.Data.Entity.ObjectSet


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Step 2: …and then Abstracting the Context

FakeSalesContext

:ISalesContext

My custom

ISalesContext

SalesContext:DbContext

:ISalesContext

UOW/RepositorytakesISalesContext IUow

needsIContext

IContext

(No pre-defined DbSets)

IDbSet(Customer)IDbSet(Order)

IDbSet(…)DbSet(Customer)DbSet(Order)

DbSet(…)

FakeDbSet(Customer)FakeDbSet(Order)

FakeDbSet(…)


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IRepository

IUnitofWork

Abstractions & Their Interactions

IContext

IDbSet


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SalesRepositoryUoW

SalesContextDbSet

DbSet < … >

SalesRepository

UoW

FakeSalesContextFakeOrderDbSet

FakexxDbSet

CustomerRepository

UoW

CustSvcContextDbSet

DbSet < … >


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IContext

IMode lContextIDbSet(class A)

IDbSet(classB)

Mode lContextIDbSet(class A)IDbSet(classB)

FakeMode lContextIDbSet(class A)IDbSet(classB)

IUnitOfWork

UnitOfWork

System.Data.Entity.

IDbSet

abstract

FakeDbSet

Class FakeDbSet:FakeDbSet

IEntityRepository

IClass Repository:IEntityRepository

Class Repository

: IClass Repository

Layers, Layers & More Layers


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Unit of Work

Classes

UI

Getting EF Out of the Way

Tests

System.Data.Entity

Metadata &DbContext

FakeDbSet

FakeContext B

ositoriesositoriesositoriesRepositories

ClassesClassesClasses


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{


.ToList();

}

return null;}


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Over-Abstracting the DbContext or DbSet?

IContext???

FakeDbSet???


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Summary


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Resources

My books Programming Entity Framework

Programming Entity Framework: Code First

Programming Entity Framework: DbContext

My website & blogs:

thedatafarm.com (mentoring) thedatafarm.com/blog, learnentityframework.com

Entity Framework Team: blogs.msdn.com/adonet

Domain Driven Design Starting Point: www.domaindrivendesign.org

More EF, Patterns & Testing Videos:

Pluralsight On-Demand Training: pluralsight.com

MSDN Developer Center: msdn.com/data/ef
http://www.domaindrivendesign.org/http://www.domaindrivendesign.org/

Documents

4 Efarchitecture m4 Testing Slides