Verify.EntityFramework/readme.md

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

[![Build status](https://ci.appveyor.com/api/projects/status/g6njwv0aox62atu0?svg=true)](https://ci.appveyor.com/project/SimonCropp/verify-entityframework)
[![NuGet Status](https://img.shields.io/nuget/v/Verify.EntityFramework.svg)](https://www.nuget.org/packages/Verify.EntityFramework/)

Extends [Verify](https://github.com/SimonCropp/Verify) to allow verification of EntityFramework bits.


<!-- toc -->
## Contents

  * [Usage](#usage)
    * [ChangeTracking](#changetracking)
    * [Queryable](#queryable)<!-- endtoc -->


## NuGet package

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


## Usage

Enable VerifyEntityFramewok once at assembly load time:

<!-- snippet: Enable -->
<a id='snippet-enable'/></a>
```cs
VerifyEntityFramework.Enable();
```
<sup><a href='/src/Tests/GlobalSetup.cs#L9-L11' title='File snippet `enable` was extracted from'>snippet source</a> | <a href='#snippet-enable' title='Navigate to start of snippet `enable`'>anchor</a></sup>
<!-- endsnippet -->


### ChangeTracking

Added, deleted, and Modified entities can be verified by performing changes on a DbContext and then verifying that context. This approach leverages the [EntityFramework ChangeTracker](https://docs.microsoft.com/en-us/dotnet/api/microsoft.entityframeworkcore.changetracking.changetracker).


#### Added entity

This test:

<!-- snippet: Added -->
<a id='snippet-added'/></a>
```cs
[Fact]
public async Task Added()
{
    var options = DbContextOptions();

    await using var context = new SampleDbContext(options);
    context.Add(new Company {Content = "before"});
    await Verify(context);
}
```
<sup><a href='/src/Tests/Tests.cs#L12-L22' title='File snippet `added` was extracted from'>snippet source</a> | <a href='#snippet-added' title='Navigate to start of snippet `added`'>anchor</a></sup>
<!-- endsnippet -->

Will result in the following verified file:

<!-- snippet: Tests.Added.verified.txt -->
<a id='snippet-Tests.Added.verified.txt'/></a>
```txt
{
  Added: {
    Company: {
      Id: 0,
      Content: 'before'
    }
  }
}
```
<sup><a href='/src/Tests/Tests.Added.verified.txt#L1-L8' title='File snippet `Tests.Added.verified.txt` was extracted from'>snippet source</a> | <a href='#snippet-Tests.Added.verified.txt' title='Navigate to start of snippet `Tests.Added.verified.txt`'>anchor</a></sup>
<!-- endsnippet -->


#### Deleted entity

This test:

<!-- snippet: Deleted -->
<a id='snippet-deleted'/></a>
```cs
[Fact]
public async Task Deleted()
{
    var options = DbContextOptions();

    await using (var context = new SampleDbContext(options))
    {
        context.Add(new Company {Content = "before"});
        context.SaveChanges();
    }

    await using (var context = new SampleDbContext(options))
    {
        var company = context.Companies.Single();
        context.Companies.Remove(company);
        await Verify(context);
    }
}
```
<sup><a href='/src/Tests/Tests.cs#L24-L43' title='File snippet `deleted` was extracted from'>snippet source</a> | <a href='#snippet-deleted' title='Navigate to start of snippet `deleted`'>anchor</a></sup>
<!-- endsnippet -->

Will result in the following verified file:

<!-- snippet: Tests.Deleted.verified.txt -->
<a id='snippet-Tests.Deleted.verified.txt'/></a>
```txt
{
  Deleted: {
    Company: {
      Id: 0
    }
  }
}
```
<sup><a href='/src/Tests/Tests.Deleted.verified.txt#L1-L7' title='File snippet `Tests.Deleted.verified.txt` was extracted from'>snippet source</a> | <a href='#snippet-Tests.Deleted.verified.txt' title='Navigate to start of snippet `Tests.Deleted.verified.txt`'>anchor</a></sup>
<!-- endsnippet -->


#### Modified entity

This test:

<!-- snippet: Modified -->
<a id='snippet-modified'/></a>
```cs
[Fact]
public async Task Modified()
{
    var options = DbContextOptions();

    await using var context = new SampleDbContext(options);
    var company = new Company {Content = "before"};
    context.Add(company);
    context.SaveChanges();

    context.Companies.Single().Content = "after";
    await Verify(context);
}
```
<sup><a href='/src/Tests/Tests.cs#L45-L59' title='File snippet `modified` was extracted from'>snippet source</a> | <a href='#snippet-modified' title='Navigate to start of snippet `modified`'>anchor</a></sup>
<!-- endsnippet -->

Will result in the following verified file:

<!-- snippet: Tests.Modified.verified.txt -->
<a id='snippet-Tests.Modified.verified.txt'/></a>
```txt
{
  Modified: {
    Company: {
      Id: 0,
      Content: {
        Original: 'before',
        Current: 'after'
      }
    }
  }
}
```
<sup><a href='/src/Tests/Tests.Modified.verified.txt#L1-L11' title='File snippet `Tests.Modified.verified.txt` was extracted from'>snippet source</a> | <a href='#snippet-Tests.Modified.verified.txt' title='Navigate to start of snippet `Tests.Modified.verified.txt`'>anchor</a></sup>
<!-- endsnippet -->


### Queryable

This test:

<!-- snippet: Queryable -->
<a id='snippet-queryable'/></a>
```cs
[Fact]
public async Task Queryable()
{
    var database = await DbContextBuilder.GetDatabase("Queryable");
    var dbContext = database.Context;
    var queryable = dbContext.Companies.Where(x => x.Content == "value");
    await Verify(queryable);
}
```
<sup><a href='/src/Tests/Tests.cs#L119-L128' title='File snippet `queryable` was extracted from'>snippet source</a> | <a href='#snippet-queryable' title='Navigate to start of snippet `queryable`'>anchor</a></sup>
<!-- endsnippet -->

Will result in the following verified file:

<!-- snippet: Tests.Queryable.verified.txt -->
<a id='snippet-Tests.Queryable.verified.txt'/></a>
```txt
SELECT [c].[Id], [c].[Content]
FROM [Companies] AS [c]
WHERE [c].[Content] = N'value'
```
<sup><a href='/src/Tests/Tests.Queryable.verified.txt#L1-L3' title='File snippet `Tests.Queryable.verified.txt` was extracted from'>snippet source</a> | <a href='#snippet-Tests.Queryable.verified.txt' title='Navigate to start of snippet `Tests.Queryable.verified.txt`'>anchor</a></sup>
<!-- endsnippet -->


## Icon

[Database](https://thenounproject.com/term/database/310841/) designed by [Creative Stall](https://thenounproject.com/creativestall/) from [The Noun Project](https://thenounproject.com/creativepriyanka).