Easy Mock wrapper for mocking EntityFrameworkCore 5 (EFCore5) DbContext and DbSet in your unit-tests. Integrates with Moq or NSubstitute.
😢 Are you still stuck on EF Core 3.1? No worries, just visit this repository.
😮 Wait, did you say EF6? You really should get worried! Anyway, visit this repository.
PM> Install-Package EntityFrameworkCoreMock.Moq
PM> Install-Package EntityFrameworkCoreMock.NSubstitute
- In-memory storage of test data
- Querying of in-memory test data (synchronous or asynchronous)
- Tracking of updates, inserts and deletes of in-memory test data
- Emulation of
SaveChangesandSaveChangesAsync(only saves tracked changes to the mocked in-memory DbSet when one of these methods are called) - Auto-increment identity columns, annotated by the
[Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]attribute - Primary key on multiple columns, annotated by the
[Key, Column(Order = X)]attributes
- Throwing a
DbUpdateExceptionwhen inserting 2 or more entities with the same primary key while callingSaveChanges/SaveChangesAsync(emulating EF behavior) - Throwing a
DbUpdateConcurrencyExceptionwhen removing a model that no longer exists (emulating EF behavior)
For the Moq version, you can use all known Moq features, since both DbSetMock and DbContextMock inherit from Mock<DbSet> and Mock<DbContext> respectively.
public class User
{
[Key, Column(Order = 0)]
public Guid Id { get; set; }
public string FullName { get; set; }
}
public class TestDbContext : DbContext
{
public TestDbContext(DbContextOptions<TestDbContext> options)
: base(options)
{
}
public virtual DbSet<User> Users { get; set; }
}
public class MyTests
{
[Fact]
public void DbSetTest()
{
var initialEntities = new[]
{
new User { Id = Guid.NewGuid(), FullName = "Eric Cartoon" },
new User { Id = Guid.NewGuid(), FullName = "Billy Jewel" },
};
var dbContextMock = new DbContextMock<TestDbContext>(DummyOptions);
var usersDbSetMock = dbContextMock.CreateDbSetMock(x => x.Users, initialEntities);
// Pass dbContextMock.Object to the class/method you want to test
// Query dbContextMock.Object.Users to see if certain users were added or removed
// or use Mock Verify functionality to verify if certain methods were called: usersDbSetMock.Verify(x => x.Add(...), Times.Once);
}
}
public DbContextOptions<TestDbContext> DummyOptions { get; } = new DbContextOptionsBuilder<TestDbContext>().Options;
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