Question
I'm trying to build a quick test that deletes and recreates a database every time it runs. I have the following:
[TestClass]
public class PocoTest
{
private TransactionScope _transactionScope;
private ProjectDataSource _dataSource;
private Repository _repository = new Repository();
private const string _cstring = "Data Source=.;Initial Catalog=test_db;Trusted_Connection=True";
[TestInitialize]
public virtual void TestInitialize()
{
_dataSource = new ProjectDataSource(_cstring);
_dataSource.Database.Delete();
_dataSource.Database.CreateIfNotExists();
_transactionScope = new TransactionScope();
}
[TestMethod]
public void TestBasicOperations()
{
var item = _repository.AddItem(new Item(){Details = "Test Item"});
// AddItem makes a call through the data context to add a set and then calls datacontext.SaveChanges()
}
[TestCleanup]
public void TestCleanup()
{
// rollback
if (_transactionScope != null)
{
_transactionScope.Dispose();
}
}
However when I run the test I get the following error:
Result Message: Test method Project.Repository.UnitTests.PocoTest.TestBasicOperations threw exception: System.Data.SqlClient.SqlException: CREATE DATABASE statement not allowed within multi-statement transaction.
ProjectDataSource is here:
public class ProjectDataSource : DbContext, IProjectDataSource
{
public ProjectDataSource() : base("DefaultConnection")
{
}
public ProjectDataSource(string connectionString) : base(connectionString)
{
}
public DbSet<Set> Sets { get; set; }
}
Repository:
public class Repository : IRepository
{
private readonly ProjectDataSource _db = new ProjectDataSource();
public Item AddItem(Item item)
{
_db.Items.Add(item);
_db.SaveChanges();
return item;
}
}
Why is this happening?
Also - if it makes any difference - the error doesn't occur if I comment out the AddItem line in TestMethod.
Accepted Answer
In case anyone else runs into this issue:
In my Repository class, I have another definition of what's commonly labeled a "dbContext" - ProjectDataSource. This means that one context was created in my test class, while another was created in my Repository object. Sending the connectionstring to my repo class solved the problem:
In Repository:
public class Repository : IRepository
{
private readonly ProjectDataSource _db;
public Repository(string connectionString)
{
_db = new ProjectDataSource(connectionString);
}
public Repository()
{
_db = new ProjectDataSource();
}
From my test:
private TransactionScope _transactionScope;
private Repository _repository;
private ProjectDataSource _dataSource;
private const string _connectionString = "Data Source=.;Initial Catalog=test_db;Trusted_Connection=True";
[TestInitialize]
public virtual void TestInitialize()
{
_repository = new Repository(_connectionString);
_dataSource = new ProjectDataSource(_connectionString);
_dataSource.Database.Delete();
_dataSource.Database.CreateIfNotExists();
_transactionScope = new TransactionScope();
}
Popular Answer
You can also use db.Database.ExecuteSqlCommand(TransactionalBehavior.DoNotEnsureTransaction, sqlCommand);
See https://stackoverflow.com/a/24344654/375114 for details
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