Lightly touch EntityFramework article (#129)
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Ivo Stoilov
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@ -17,36 +17,35 @@ __Telerik® JustMock__ allows you to perform unit testing in conjunctions with t
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With __Microsoft Entity Framework__, you develop data access applications by using a conceptual application model instead of a relational storage schema.
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__JustMock__ supports the Microsoft Entity Framework thanks to the [Telerik.JustMock.EntityFramework](https://github.com/tailsu/Telerik.JustMock.EntityFramework) package. This package allows you to easily create in-memory mocks of the DbSet and DbContext types. It also provides additional mocking amenities for JustMock.
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__JustMock__ supports both EntityFramework and EntityFrameworkCore thanks to the extension packages respectively [Telerik.JustMock.EntityFramework](https://github.com/telerik/Telerik.JustMock.EntityFramework) and [Telerik.JustMock.EntityFrameworkCore](https://github.com/telerik/Telerik.JustMock.EntityFrameworkCore). The packages allows you to easily create in-memory mocks of the DbSet and DbContext types. It also provides additional mocking amenities for JustMock.
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In this topic, we will cover some scenarios in unit testing Microsoft Entity Framework. In the examples below, we use the `DbContext` class along with the following methods:
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In this topic, we will cover some common scenarios in the EntityFramework unit testing. In the examples below, we use the `DbContext` class along with the following methods:
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#### __[C#]__
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#### __[C#]__
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{{region EntityFramework#Samples}}
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public class NerdDinners : DbContext
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{
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public DbSet<Dinner> Dinners { get; set; }
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public DbSet<RSVP> RSVPs { get; set; }
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}
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public class Dinner
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{
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public int DinnerID { get; set; }
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public string Title { get; set; }
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public DateTime EventDate { get; set; }
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public string Address { get; set; }
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public string HostedBy { get; set; }
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}
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public class RSVP
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{
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public int RSVPID { get; set; }
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public int DinnerID { get; set; }
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public string AtendeeEmail { get; set; }
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}
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{{endregion}}
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{{region EntityFramework#Samples}}
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public class NerdDinners : DbContext
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{
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public DbSet<Dinner> Dinners { get; set; }
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public DbSet<RSVP> RSVPs { get; set; }
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}
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public class Dinner
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{
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public int DinnerID { get; set; }
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public string Title { get; set; }
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public DateTime EventDate { get; set; }
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public string Address { get; set; }
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public string HostedBy { get; set; }
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}
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public class RSVP
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{
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public int RSVPID { get; set; }
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public int DinnerID { get; set; }
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public string AtendeeEmail { get; set; }
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}
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{{endregion}}
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## Returning A Fake Collection
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@ -55,19 +54,19 @@ The following steps demonstrate how to return a fake collection:
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1. Create a method that returns a fake collection of `Dinner`s. For this example, we use the code below:
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#### __[C#]__
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#### __[C#]__
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{{region EntityFramework#FakeDinnersReturn}}
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{{region EntityFramework#FakeDinnersReturn}}
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public IList<Dinner> FakeDinners()
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{
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List<Dinner> fakeDin = new List<Dinner>
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{
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new Dinner { Address = "1 Microsoft way", DinnerID = 1, EventDate =DateTime.Now, HostedBy = "Telerik" , Title = "Telerik Dinner"}
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};
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return fakeDin;
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}
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{{endregion}}
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{
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List<Dinner> fakeDin = new List<Dinner>
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{
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new Dinner { Address = "1 Microsoft way", DinnerID = 1, EventDate =DateTime.Now, HostedBy = "Telerik" , Title = "Telerik Dinner"}
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};
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return fakeDin;
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}
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{{endregion}}
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1. Create a new instance of the `NerdDinners` class.
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@ -81,101 +80,100 @@ The following steps demonstrate how to return a fake collection:
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>
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> Note that when you use `ReturnsCollection()` you must be using the `Telerik.JustMock.Helpers;`.
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#### __[C#]__
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#### __[C#]__
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{{region EntityFramework#MockingCollectionReturn}}
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[TestMethod]
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public void ShouldReturnFakeCollectionWhenExpected()
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{
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NerdDinners nerdDinners = new NerdDinners();
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// Arrange
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Mock.Arrange(() => nerdDinners.Dinners).ReturnsCollection(FakeDinners());
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// Act
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var query = from d in nerdDinners.Dinners
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where d.DinnerID == 1
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select d;
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// Assert
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Assert.AreEqual(1, query.Count());
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Assert.AreEqual(1, query.First().DinnerID);
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}
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{{endregion}}
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{{region EntityFramework#MockingCollectionReturn}}
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[TestMethod]
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public void ShouldReturnFakeCollectionWhenExpected()
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{
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NerdDinners nerdDinners = new NerdDinners();
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// Arrange
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Mock.Arrange(() => nerdDinners.Dinners).ReturnsCollection(FakeDinners());
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// Act
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var query = from d in nerdDinners.Dinners
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where d.DinnerID == 1
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select d;
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// Assert
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Assert.AreEqual(1, query.Count());
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Assert.AreEqual(1, query.First().DinnerID);
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}
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{{endregion}}
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## Returning A Fake Collection with Future Mocking
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In this example we will return the same fake collection.
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#### __[C#]__
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#### __[C#]__
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{{region EntityFramework#FakeDinnersReturn}}
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{{region EntityFramework#FakeDinnersReturn}}
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public IList<Dinner> FakeDinners()
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{
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List<Dinner> fakeDin = new List<Dinner>
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{
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new Dinner { Address = "1 Microsoft way", DinnerID = 1, EventDate =DateTime.Now, HostedBy = "Telerik" , Title = "Telerik Dinner"}
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};
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return fakeDin;
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}
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{{endregion}}
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{
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List<Dinner> fakeDin = new List<Dinner>
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{
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new Dinner { Address = "1 Microsoft way", DinnerID = 1, EventDate =DateTime.Now, HostedBy = "Telerik" , Title = "Telerik Dinner"}
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};
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return fakeDin;
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}
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{{endregion}}
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To assure that the instance does not matter during the __Act__ phase we will make a repository class:
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#### __[C#]__
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#### __[C#]__
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{{region EntityFramework#DinnersRepository}}
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public class DinnerRepository
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{
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public Dinner GetById(int dinnerId)
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{
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NerdDinners nerdDinners = new NerdDinners();
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var query = from d in nerdDinners.Dinners
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where d.DinnerID == 1
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select d;
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return query.First();
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}
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}
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{{endregion}}
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{{region EntityFramework#DinnersRepository}}
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public class DinnerRepository
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{
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public Dinner GetById(int dinnerId)
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{
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NerdDinners nerdDinners = new NerdDinners();
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var query = from d in nerdDinners.Dinners
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where d.DinnerID == 1
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select d;
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return query.First();
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}
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}
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{{endregion}}
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As you see, in the test below we are acting with a `new DinnerRepository()`, but still we are meeting the expectations and the test passes. This behavior is known and expected in [Future Mocking]({%slug justmock/advanced-usage/future-mocking%}).
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> Note that when you use `ReturnsCollection()` you must be using the `Telerik.JustMock.Helpers;` namespace.
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#### __[C#]__
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#### __[C#]__
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{{region EntityFramework#FutureMockingCollectionReturn}}
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[TestMethod]
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public void ShouldReturnFakeCollectionForFutureInstance()
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{
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NerdDinners nerdDinners = new NerdDinners();
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Mock.Arrange(() => nerdDinners.Dinners).IgnoreInstance().ReturnsCollection(FakeDinners());
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Assert.AreEqual(1, new DinnerRepository().GetById(1).DinnerID);
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}
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{{endregion}}
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{{region EntityFramework#FutureMockingCollectionReturn}}
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[TestMethod]
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public void ShouldReturnFakeCollectionForFutureInstance()
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{
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NerdDinners nerdDinners = new NerdDinners();
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Mock.Arrange(() => nerdDinners.Dinners).IgnoreInstance().ReturnsCollection(FakeDinners());
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Assert.AreEqual(1, new DinnerRepository().GetById(1).DinnerID);
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}
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{{endregion}}
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## Faking the Add of an Entity
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In the next example we will __Arrange__ the calling of the `Add()` method to actually add an item to a previously created local collection.
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#### __[C#]__
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{{region EntityFramework#FakingAdd}}
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[TestMethod]
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public void ShouldReturnFakeCollectionForFutureInstance()
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{
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NerdDinners nerdDinners = new NerdDinners();
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Mock.Arrange(() => nerdDinners.Dinners).IgnoreInstance().ReturnsCollection(FakeDinners());
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Assert.AreEqual(1, new DinnerRepository().GetById(1).DinnerID);
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}
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{{endregion}}
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#### __[C#]__
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{{region EntityFramework#FakingAdd}}
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[TestMethod]
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public void ShouldReturnFakeCollectionForFutureInstance()
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{
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NerdDinners nerdDinners = new NerdDinners();
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Mock.Arrange(() => nerdDinners.Dinners).IgnoreInstance().ReturnsCollection(FakeDinners());
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Assert.AreEqual(1, new DinnerRepository().GetById(1).DinnerID);
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}
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{{endregion}}
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Here are the steps:
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@ -185,5 +183,5 @@ Here are the steps:
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1. Arrange that the `SaveChanges()` method is doing nothing.
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1. Act by calling `Add(dinner)` and `SaveChanges()`.
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1. Verify that:
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* the collection has exactly *one* item
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* this item is exactly the object from *step 2.*
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* the collection has exactly *one* item
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* this item is exactly the object from *step 2.*
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