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<img src="/src/icon.png" height="30px"> Verify.EntityFramework

Extends Verify to allow snapshot testing with EntityFramework.

See Milestones for release notes.

NuGet packages

• https://nuget.org/packages/Verify.EntityFramework/
• https://nuget.org/packages/Verify.EntityFrameworkClassic/

Enable

Enable VerifyEntityFramework once at assembly load time:

EF Core

<a id='snippet-EnableCore'></a>

static IModel GetDbModel()
{
    var options = new DbContextOptionsBuilder<SampleDbContext>();
    options.UseSqlServer("fake");
    using var data = new SampleDbContext(options.Options);
    return data.Model;
}

[ModuleInitializer]
public static void Init()
{
    var model = GetDbModel();
    VerifyEntityFramework.Initialize(model);
}

^{<a href='/src/Verify.EntityFramework.Tests/ModuleInitializer.cs#L5-L22' title='Snippet source file'>snippet source</a> | <a href='#snippet-EnableCore' title='Start of snippet'>anchor</a>}

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

<a id='snippet-EnableClassic'></a>

[ModuleInitializer]
public static void Init() =>
    VerifyEntityFrameworkClassic.Initialize();

^{<a href='/src/Verify.EntityFrameworkClassic.Tests/ModuleInitializer.cs#L3-L9' title='Snippet source file'>snippet source</a> | <a href='#snippet-EnableClassic' title='Start of snippet'>anchor</a>}

Recording

Recording allows all commands executed by EF to be captured and then (optionally) verified.

Enable

Call EfRecording.EnableRecording() on DbContextOptionsBuilder.

<a id='snippet-EnableRecording'></a>

var builder = new DbContextOptionsBuilder<SampleDbContext>();
builder.UseSqlServer(connection);
builder.EnableRecording();
var data = new SampleDbContext(builder.Options);

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L384-L391' title='Snippet source file'>snippet source</a> | <a href='#snippet-EnableRecording' title='Start of snippet'>anchor</a>}

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.

<a id='snippet-Recording'></a>

var company = new Company
{
    Name = "Title"
};
data.Add(company);
await data.SaveChangesAsync();

Recording.Start();

await data
    .Companies
    .Where(_ => _.Name == "Title")
    .ToListAsync();

await Verify();

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L483-L501' title='Snippet source file'>snippet source</a> | <a href='#snippet-Recording' title='Start of snippet'>anchor</a>}

Will result in the following verified file:

<a id='snippet-CoreTests.RecordingTest.verified.txt'></a>

{
  ef: {
    Type: ReaderExecutedAsync,
    HasTransaction: false,
    Text:
SELECT [c].[Id], [c].[Name]
FROM [Companies] AS [c]
WHERE [c].[Name] = N'Title'
  }
}

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.RecordingTest.verified.txt#L1-L10' title='Snippet source file'>snippet source</a> | <a href='#snippet-CoreTests.RecordingTest.verified.txt' title='Start of snippet'>anchor</a>}

Sql entries can be explicitly read using EfRecording.FinishRecording, optionally filtered, and passed to Verify:

<a id='snippet-RecordingSpecific'></a>

var company = new Company
{
    Name = "Title"
};
data.Add(company);
await data.SaveChangesAsync();

Recording.Start();

await data
    .Companies
    .Where(_ => _.Name == "Title")
    .ToListAsync();

var entries = Recording.Stop();
//TODO: optionally filter the results
await Verify(
    new
    {
        target = data.Companies.Count(),
        entries
    });

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L639-L664' title='Snippet source file'>snippet source</a> | <a href='#snippet-RecordingSpecific' title='Start of snippet'>anchor</a>}

DbContext spanning

StartRecording can be called on different DbContext instances (built from the same options) and the results will be aggregated.

<a id='snippet-MultiDbContexts'></a>

var builder = new DbContextOptionsBuilder<SampleDbContext>();
builder.UseSqlServer(connectionString);
builder.EnableRecording();

await using var data1 = new SampleDbContext(builder.Options);
Recording.Start();
var company = new Company
{
    Name = "Title"
};
data1.Add(company);
await data1.SaveChangesAsync();

await using var data2 = new SampleDbContext(builder.Options);
await data2
    .Companies
    .Where(_ => _.Name == "Title")
    .ToListAsync();

await Verify();

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L451-L474' title='Snippet source file'>snippet source</a> | <a href='#snippet-MultiDbContexts' title='Start of snippet'>anchor</a>}

<a id='snippet-CoreTests.MultiDbContexts.verified.txt'></a>

{
  ef: [
    {
      Type: ReaderExecutedAsync,
      HasTransaction: false,
      Parameters: {
        @p0 (Int32): 0,
        @p1 (String): Title
      },
      Text:
SET IMPLICIT_TRANSACTIONS OFF;
SET NOCOUNT ON;
INSERT INTO [Companies] ([Id], [Name])
VALUES (@p0, @p1);
    },
    {
      Type: ReaderExecutedAsync,
      HasTransaction: false,
      Text:
SELECT [c].[Id], [c].[Name]
FROM [Companies] AS [c]
WHERE [c].[Name] = N'Title'
    }
  ]
}

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.MultiDbContexts.verified.txt#L1-L25' title='Snippet source file'>snippet source</a> | <a href='#snippet-CoreTests.MultiDbContexts.verified.txt' title='Start of snippet'>anchor</a>}

Disabling Recording for an instance

<a id='snippet-RecordingDisableForInstance'></a>

var company = new Company
{
    Name = "Title"
};
data.Add(company);
await data.SaveChangesAsync();

Recording.Start();

await data
    .Companies
    .Where(_ => _.Name == "Title")
    .ToListAsync();
data.DisableRecording();
await data
    .Companies
    .Where(_ => _.Name == "Disabled")
    .ToListAsync();

await Verify();

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L510-L533' title='Snippet source file'>snippet source</a> | <a href='#snippet-RecordingDisableForInstance' title='Start of snippet'>anchor</a>}

<a id='snippet-CoreTests.RecordingDisabledTest.verified.txt'></a>

{
  ef: {
    Type: ReaderExecutedAsync,
    HasTransaction: false,
    Text:
SELECT [c].[Id], [c].[Name]
FROM [Companies] AS [c]
WHERE [c].[Name] = N'Title'
  }
}

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.RecordingDisabledTest.verified.txt#L1-L10' title='Snippet source file'>snippet source</a> | <a href='#snippet-CoreTests.RecordingDisabledTest.verified.txt' title='Start of snippet'>anchor</a>}

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.

Added entity

This test:

<a id='snippet-Added'></a>

[Test]
public async Task Added()
{
    var options = DbContextOptions();

    await using var data = new SampleDbContext(options);
    var company = new Company
    {
        Name = "company name"
    };
    data.Add(company);
    await Verify(data.ChangeTracker);
}

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L87-L103' title='Snippet source file'>snippet source</a> | <a href='#snippet-Added' title='Start of snippet'>anchor</a>}

Will result in the following verified file:

<a id='snippet-CoreTests.Added.verified.txt'></a>

{
  Added: {
    Company: {
      Id: 0,
      Name: company name
    }
  }
}

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.Added.verified.txt#L1-L8' title='Snippet source file'>snippet source</a> | <a href='#snippet-CoreTests.Added.verified.txt' title='Start of snippet'>anchor</a>}

Deleted entity

This test:

<a id='snippet-Deleted'></a>

[Test]
public async Task Deleted()
{
    var options = DbContextOptions();

    await using var data = new SampleDbContext(options);
    data.Add(new Company
    {
        Name = "company name"
    });
    await data.SaveChangesAsync();

    var company = data.Companies.Single();
    data.Companies.Remove(company);
    await Verify(data.ChangeTracker);
}

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L105-L124' title='Snippet source file'>snippet source</a> | <a href='#snippet-Deleted' title='Start of snippet'>anchor</a>}

Will result in the following verified file:

<a id='snippet-CoreTests.Deleted.verified.txt'></a>

{
  Deleted: {
    Company: {
      Id: 0
    }
  }
}

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.Deleted.verified.txt#L1-L7' title='Snippet source file'>snippet source</a> | <a href='#snippet-CoreTests.Deleted.verified.txt' title='Start of snippet'>anchor</a>}

Modified entity

This test:

<a id='snippet-Modified'></a>

[Test]
public async Task Modified()
{
    var options = DbContextOptions();

    await using var data = new SampleDbContext(options);
    var company = new Company
    {
        Name = "old name"
    };
    data.Add(company);
    await data.SaveChangesAsync();

    data.Companies.Single()
        .Name = "new name";
    await Verify(data.ChangeTracker);
}

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L126-L146' title='Snippet source file'>snippet source</a> | <a href='#snippet-Modified' title='Start of snippet'>anchor</a>}

Will result in the following verified file:

<a id='snippet-CoreTests.Modified.verified.txt'></a>

{
  Modified: {
    Company: {
      Id: 0,
      Name: {
        Original: old name,
        Current: new name
      }
    }
  }
}

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.Modified.verified.txt#L1-L11' title='Snippet source file'>snippet source</a> | <a href='#snippet-CoreTests.Modified.verified.txt' title='Start of snippet'>anchor</a>}

Queryable

This test:

<a id='snippet-Queryable'></a>

var queryable = data.Companies
    .Where(_ => _.Name == "company name");
await Verify(queryable);

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L341-L347' title='Snippet source file'>snippet source</a> | <a href='#snippet-Queryable' title='Start of snippet'>anchor</a>}

Will result in the following verified files:

EF Core

CoreTests.Queryable.verified.txt

<a id='snippet-CoreTests.Queryable.verified.txt'></a>

[
  {
    Name: company name
  }
]

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.Queryable.verified.txt#L1-L5' title='Snippet source file'>snippet source</a> | <a href='#snippet-CoreTests.Queryable.verified.txt' title='Start of snippet'>anchor</a>}

CoreTests.Queryable.verified.sql

<a id='snippet-CoreTests.Queryable.verified.sql'></a>

SELECT [c].[Id], [c].[Name]
FROM [Companies] AS [c]
WHERE [c].[Name] = N'company name'

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.Queryable.verified.sql#L1-L3' title='Snippet source file'>snippet source</a> | <a href='#snippet-CoreTests.Queryable.verified.sql' title='Start of snippet'>anchor</a>}

EF Classic

ClassicTests.Queryable.verified.txt

<a id='snippet-ClassicTests.Queryable.verified.txt'></a>

SELECT 
    [Extent1].[Id] AS [Id], 
    [Extent1].[Content] AS [Content]
    FROM [dbo].[Companies] AS [Extent1]
    WHERE N'value' = [Extent1].[Content]

^{<a href='/src/Verify.EntityFrameworkClassic.Tests/ClassicTests.Queryable.verified.txt#L1-L5' title='Snippet source file'>snippet source</a> | <a href='#snippet-ClassicTests.Queryable.verified.txt' title='Start of snippet'>anchor</a>}

AllData

This test:

<a id='snippet-AllData'></a>

await Verify(data.AllData())
    .AddExtraSettings(
        serializer =>
            serializer.TypeNameHandling = TypeNameHandling.Objects);

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L320-L327' title='Snippet source file'>snippet source</a> | <a href='#snippet-AllData' title='Start of snippet'>anchor</a>}

Will result in the following verified file with all data in the database:

<a id='snippet-CoreTests.AllData.verified.txt'></a>

[
  {
    $type: Company,
    Id: 1,
    Name: Company1
  },
  {
    $type: Company,
    Id: 4,
    Name: Company2
  },
  {
    $type: Company,
    Id: 6,
    Name: Company3
  },
  {
    $type: Company,
    Id: 7,
    Name: Company4
  },
  {
    $type: Employee,
    Id: 2,
    CompanyId: 1,
    Name: Employee1,
    Age: 25
  },
  {
    $type: Employee,
    Id: 3,
    CompanyId: 1,
    Name: Employee2,
    Age: 31
  },
  {
    $type: Employee,
    Id: 5,
    CompanyId: 4,
    Name: Employee4,
    Age: 34
  }
]

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.AllData.verified.txt#L1-L43' title='Snippet source file'>snippet source</a> | <a href='#snippet-CoreTests.AllData.verified.txt' title='Start of snippet'>anchor</a>}

IgnoreNavigationProperties

IgnoreNavigationProperties extends SerializationSettings to exclude all navigation properties from serialization:

<a id='snippet-IgnoreNavigationProperties'></a>

[Test]
public async Task IgnoreNavigationProperties()
{
    var options = DbContextOptions();

    await using var data = new SampleDbContext(options);

    var company = new Company
    {
        Name = "company"
    };
    var employee = new Employee
    {
        Name = "employee",
        Company = company
    };
    await Verify(employee)
        .IgnoreNavigationProperties();
}

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L148-L170' title='Snippet source file'>snippet source</a> | <a href='#snippet-IgnoreNavigationProperties' title='Start of snippet'>anchor</a>}

Ignore globally

<a id='snippet-IgnoreNavigationPropertiesGlobal'></a>

var options = DbContextOptions();
using var data = new SampleDbContext(options);
VerifyEntityFramework.IgnoreNavigationProperties();

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L198-L204' title='Snippet source file'>snippet source</a> | <a href='#snippet-IgnoreNavigationPropertiesGlobal' title='Start of snippet'>anchor</a>}

WebApplicationFactory

To be able to use WebApplicationFactory for integration testing 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:

<a id='snippet-EnableRecordingWithIdentifier'></a>

protected override void ConfigureWebHost(IWebHostBuilder webBuilder)
{
    var dataBuilder = new DbContextOptionsBuilder<SampleDbContext>()
        .EnableRecording(name)
        .UseSqlite($"Data Source={name};Mode=Memory;Cache=Shared");
    webBuilder.ConfigureTestServices(
        _ => _.AddScoped(
            _ => dataBuilder.Options));
}

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L593-L605' title='Snippet source file'>snippet source</a> | <a href='#snippet-EnableRecordingWithIdentifier' title='Start of snippet'>anchor</a>}

Then use the same identifier for recording:

<a id='snippet-RecordWithIdentifier'></a>

var httpClient = factory.CreateClient();

Recording.Start(testName);

var companies = await httpClient.GetFromJsonAsync<Company[]>("/companies");

var entries = Recording.Stop(testName);

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L566-L576' title='Snippet source file'>snippet source</a> | <a href='#snippet-RecordWithIdentifier' title='Start of snippet'>anchor</a>}

The results will not be automatically included in verified file so it will have to be verified manually:

<a id='snippet-VerifyRecordedCommandsWithIdentifier'></a>

await Verify(
    new
    {
        target = companies!.Length,
        sql = entries
    });

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L578-L587' title='Snippet source file'>snippet source</a> | <a href='#snippet-VerifyRecordedCommandsWithIdentifier' title='Start of snippet'>anchor</a>}

ScrubInlineEfDateTimes

In some scenarios EntityFrmaeowrk does not parameterise DateTimes. For example when querying temporal tables.

ScrubInlineEfDateTimes() is a convenience method that calls .ScrubInlineDateTimes("yyyy-MM-ddTHH:mm:ss.fffffffZ").

Static usage

VerifyEntityFramework.ScrubInlineEfDateTimes();

Instance usage

<a id='snippet-ScrubInlineEfDateTimesInstance'></a>

var settings = new VerifySettings();
settings.ScrubInlineEfDateTimes();
await Verify(target, settings);

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L34-L40' title='Snippet source file'>snippet source</a> | <a href='#snippet-ScrubInlineEfDateTimesInstance' title='Start of snippet'>anchor</a>}

Fluent usage

<a id='snippet-ScrubInlineEfDateTimesFluent'></a>

await Verify(target)
    .ScrubInlineEfDateTimes();

^{<a href='/src/Verify.EntityFramework.Tests/CoreTests.cs#L48-L53' title='Snippet source file'>snippet source</a> | <a href='#snippet-ScrubInlineEfDateTimesFluent' title='Start of snippet'>anchor</a>}

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