# 
Verify.EntityFramework
[](https://ci.appveyor.com/project/SimonCropp/verify-entityframework)
[](https://www.nuget.org/packages/Verify.EntityFramework/)
[](https://www.nuget.org/packages/Verify.EntityFrameworkClassic/)
Extends [Verify](https://github.com/VerifyTests/Verify) to allow snapshot testing with EntityFramework.
## NuGet packages
* https://nuget.org/packages/Verify.EntityFramework/
* https://nuget.org/packages/Verify.EntityFrameworkClassic/
## Enable
Enable VerifyEntityFramework once at assembly load time:
### EF Core
```cs
static IModel GetDbModel()
{
var options = new DbContextOptionsBuilder();
options.UseSqlServer("fake");
using var data = new SampleDbContext(options.Options);
return data.Model;
}
[ModuleInitializer]
public static void Init()
{
var model = GetDbModel();
VerifyEntityFramework.Initialize(model);
}
```
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The `GetDbModel` pattern allows an instance of the `IModel` to be stored for use when `IgnoreNavigationProperties` is called inside tests. This is optional, and instead can be passed explicitly to `IgnoreNavigationProperties`.
### EF Classic
```cs
[ModuleInitializer]
public static void Init() =>
VerifyEntityFrameworkClassic.Initialize();
```
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## Recording
Recording allows all commands executed by EF to be captured and then (optionally) verified.
### Enable
Call `EfRecording.EnableRecording()` on `DbContextOptionsBuilder`.
```cs
var builder = new DbContextOptionsBuilder();
builder.UseSqlServer(connection);
builder.EnableRecording();
var data = new SampleDbContext(builder.Options);
```
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`EnableRecording` should only be called in the test context.
### Usage
To start recording call `EfRecording.StartRecording()`. The results will be automatically included in verified file.
```cs
var company = new Company
{
Content = "Title"
};
data.Add(company);
await data.SaveChangesAsync();
EfRecording.StartRecording();
await data.Companies
.Where(_ => _.Content == "Title")
.ToListAsync();
await Verify(data.Companies.Count());
```
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Will result in the following verified file:
```txt
{
target: 5,
sql: [
{
Type: ReaderExecutedAsync,
HasTransaction: false,
Text:
SELECT [c].[Id], [c].[Content]
FROM [Companies] AS [c]
WHERE [c].[Content] = N'Title'
},
{
Type: ReaderExecuted,
HasTransaction: false,
Text:
SELECT COUNT(*)
FROM [Companies] AS [c]
}
]
}
```
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Sql entries can be explicitly read using `EfRecording.FinishRecording`, optionally filtered, and passed to Verify:
```cs
var company = new Company
{
Content = "Title"
};
data.Add(company);
await data.SaveChangesAsync();
EfRecording.StartRecording();
await data.Companies
.Where(_ => _.Content == "Title")
.ToListAsync();
var entries = EfRecording.FinishRecording();
//TODO: optionally filter the results
await Verify(new
{
target = data.Companies.Count(),
sql = entries
});
```
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### DbContext spanning
`StartRecording` can be called on different DbContext instances (built from the same options) and the results will be aggregated.
```cs
var builder = new DbContextOptionsBuilder();
builder.UseSqlServer(connectionString);
builder.EnableRecording();
await using var data1 = new SampleDbContext(builder.Options);
EfRecording.StartRecording();
var company = new Company
{
Content = "Title"
};
data1.Add(company);
await data1.SaveChangesAsync();
await using var data2 = new SampleDbContext(builder.Options);
await data2.Companies
.Where(_ => _.Content == "Title")
.ToListAsync();
await Verify(data2.Companies.Count());
```
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```txt
{
target: 5,
sql: [
{
Type: ReaderExecutedAsync,
HasTransaction: false,
Parameters: {
@p0 (Int32): 0,
@p1 (String?): Title
},
Text:
SET IMPLICIT_TRANSACTIONS OFF;
SET NOCOUNT ON;
INSERT INTO [Companies] ([Id], [Content])
VALUES (@p0, @p1);
},
{
Type: ReaderExecutedAsync,
HasTransaction: false,
Text:
SELECT [c].[Id], [c].[Content]
FROM [Companies] AS [c]
WHERE [c].[Content] = N'Title'
},
{
Type: ReaderExecuted,
HasTransaction: false,
Text:
SELECT COUNT(*)
FROM [Companies] AS [c]
}
]
}
```
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## ChangeTracking
Added, deleted, and Modified entities can be verified by performing changes on a DbContext and then verifying the instance of ChangeTracking. This approach leverages the [EntityFramework ChangeTracker](https://docs.microsoft.com/en-us/dotnet/api/microsoft.entityframeworkcore.changetracking.changetracker).
### Added entity
This test:
```cs
[Test]
public async Task Added()
{
var options = DbContextOptions();
await using var data = new SampleDbContext(options);
var company = new Company
{
Content = "before"
};
data.Add(company);
await Verify(data.ChangeTracker);
}
```
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Will result in the following verified file:
```txt
{
Added: {
Company: {
Id: 0,
Content: before
}
}
}
```
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### Deleted entity
This test:
```cs
[Test]
public async Task Deleted()
{
var options = DbContextOptions();
await using var data = new SampleDbContext(options);
data.Add(new Company
{
Content = "before"
});
await data.SaveChangesAsync();
var company = data.Companies.Single();
data.Companies.Remove(company);
await Verify(data.ChangeTracker);
}
```
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Will result in the following verified file:
```txt
{
Deleted: {
Company: {
Id: 0
}
}
}
```
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### Modified entity
This test:
```cs
[Test]
public async Task Modified()
{
var options = DbContextOptions();
await using var data = new SampleDbContext(options);
var company = new Company
{
Content = "before"
};
data.Add(company);
await data.SaveChangesAsync();
data.Companies.Single().Content = "after";
await Verify(data.ChangeTracker);
}
```
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Will result in the following verified file:
```txt
{
Modified: {
Company: {
Id: 0,
Content: {
Original: before,
Current: after
}
}
}
}
```
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## Queryable
This test:
```cs
var queryable = data.Companies
.Where(_ => _.Content == "value");
await Verify(queryable);
```
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Will result in the following verified file:
### EF Core
```txt
SELECT [c].[Id], [c].[Content]
FROM [Companies] AS [c]
WHERE [c].[Content] = N'value'
```
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### EF Classic
```txt
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[Content] AS [Content]
FROM [dbo].[Companies] AS [Extent1]
WHERE N'value' = [Extent1].[Content]
```
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## AllData
This test:
```cs
await Verify(data.AllData())
.AddExtraSettings(
serializer =>
serializer.TypeNameHandling = TypeNameHandling.Objects);
```
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Will result in the following verified file with all data in the database:
```txt
[
{
$type: Company,
Id: 1,
Content: Company1
},
{
$type: Company,
Id: 4,
Content: Company2
},
{
$type: Company,
Id: 6,
Content: Company3
},
{
$type: Company,
Id: 7,
Content: Company4
},
{
$type: Employee,
Id: 2,
CompanyId: 1,
Content: Employee1,
Age: 25
},
{
$type: Employee,
Id: 3,
CompanyId: 1,
Content: Employee2,
Age: 31
},
{
$type: Employee,
Id: 5,
CompanyId: 4,
Content: Employee4,
Age: 34
}
]
```
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## IgnoreNavigationProperties
`IgnoreNavigationProperties` extends `SerializationSettings` to exclude all navigation properties from serialization:
```cs
[Test]
public async Task IgnoreNavigationProperties()
{
var options = DbContextOptions();
await using var data = new SampleDbContext(options);
var company = new Company
{
Content = "company"
};
var employee = new Employee
{
Content = "employee",
Company = company
};
await Verify(employee)
.IgnoreNavigationProperties();
}
```
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### Ignore globally
```cs
var options = DbContextOptions();
using var data = new SampleDbContext(options);
VerifyEntityFramework.IgnoreNavigationProperties();
```
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## WebApplicationFactory
To be able to use [WebApplicationFactory](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.mvc.testing.webapplicationfactory-1) for [integration testing](https://docs.microsoft.com/en-us/aspnet/core/test/integration-tests) an identifier must be used to be able to retrieve the recorded commands. Start by enable recording with a unique identifier, for example the test name or a GUID:
```cs
.ConfigureTestServices(services =>
{
services.AddScoped(_ =>
new DbContextOptionsBuilder()
.EnableRecording(testName)
.UseSqlite($"Data Source={testName};Mode=Memory;Cache=Shared")
.Options);
});
```
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Then use the same identifier for recording:
```cs
var httpClient = factory.CreateClient();
EfRecording.StartRecording(testName);
var companies = await httpClient.GetFromJsonAsync("/companies");
var entries = EfRecording.FinishRecording(testName);
```
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The results will not be automatically included in verified file so it will have to be verified manually:
```cs
await Verify(new
{
target = companies!.Length,
sql = entries
});
```
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## Icon
[Database](https://thenounproject.com/term/database/310841/) designed by [Creative Stall](https://thenounproject.com/creativestall/) from [The Noun Project](https://thenounproject.com).