protected Book makeBook()
{
var book = new Book() { Title = "The Hobbit" };
db.Books.Add(book);
save();
return book;
}
public void ErrorIsThrownWhenTryingToMixTransactionSystems()
{
using (var transaction = db.Database.BeginTransaction())
{
var book = new Book() { Title = "Title" };
db.Books.Add(book);
Assert.Throws<ConflictingTransactionException>(() => db.Logger.SaveChanges(user));
transaction.Rollback();
}
}
public void FrameLogMakesUseOfDbContextTransaction()
{
Book book;
var db2 = new ExampleContext();
using (var transaction = db.Database.BeginTransaction())
{
book = new Book() { Title = "Title" };
db.Books.Add(book);
db.Logger.SaveChangesWithinExplicitTransaction(user);
Assert.IsNull(db2.Books.SingleOrDefault(b => b.Id == book.Id));
transaction.Commit();
}
Assert.IsNotNull(db2.Books.SingleOrDefault(b => b.Id == book.Id));
}
public void CustomSaveChangesThatLinksAnUnattachedObjectWillBeLoggedWithTheCorrectRelationshipReferences()
{
// Arrange...
var howToLearnFrenchPart1 = new Book() { Title = HowToLearnFrenchPart1 };
// Act...
db.Books.Add(howToLearnFrenchPart1);
save();
// Assert...
var changeSet = lastChangeSet();
var frenchPart1ObjectChange = changeSet.ObjectChanges.FirstOrDefault(x => x.PropertyChanges.Any(y => y.PropertyName == "Title" && y.Value == HowToLearnFrenchPart1));
var frenchPart2ObjectChange = changeSet.ObjectChanges.FirstOrDefault(x => x.PropertyChanges.Any(y => y.PropertyName == "Title" && y.Value == HowToLearnFrenchPart2));
Assert.IsNotNull(frenchPart1ObjectChange, "Expected changes to be logged for french (part 1), but there were none");
Assert.IsNotNull(frenchPart2ObjectChange, "Expected changes to be logged for french (part 2), but there were none");
Assert.IsNotNull(howToLearnFrenchPart1.Sequel, "Expected sequal to be created for french (part 1) during save changes, but it was not");
Assert.AreEqual(howToLearnFrenchPart1.Id.ToString(), frenchPart1ObjectChange.ObjectReference, "Actual object reference for french (part 1) does not match the logged reference");
Assert.AreEqual(howToLearnFrenchPart1.Sequel.Id.ToString(), frenchPart2ObjectChange.ObjectReference, "Actual object reference for french (part 1) does not match the logged reference");
var frenchPart1SequalPropertyChange = frenchPart1ObjectChange.PropertyChanges.FirstOrDefault(x => x.PropertyName == "Sequel");
Assert.IsNotNull(frenchPart1SequalPropertyChange, "Expected property change for the 'Sequel' of french (part 1), but there was none");
Assert.AreEqual(frenchPart2ObjectChange.ObjectReference, frenchPart1SequalPropertyChange.Value, "Actual object reference for french (part 2 ) does not match the logged reference in 'Sequal' property of french (part 1)");
}
public void CustomSaveChangesThatTriggersAnExceptionWillNotPersistTheChanges()
{
// Arrange...
// NOTE: 1 million fans will trigger an overflow exception on save (see customSaveChanges() below)
var book = new Book()
{
Title = "How to be really popular",
NumberOfFans = 1000000
};
// Act...
db.Books.Add(book);
// Assert...
var ex = Assert.Throws<OverflowException>(() => save(), "Expected the book to trigger an overflow exception, but it didn't");
Assert.AreEqual(0, book.Id, "Expected that the book would not be assigned an id, but it was the id of \"{0}\"", book.Id);
}
public void CustomSaveChangesThatModifiesAnUnchangedPropertyOfAnUnchangedObjectWillBeLogged()
{
// Arrange...
var howToLearnFrenchPart1 = new Book() { Title = HowToLearnFrenchPart1 };
// Act...
db.Books.Add(howToLearnFrenchPart1);
save();
// Assert...
var changeSet = lastChangeSet();
var frenchPart1ObjectChange = changeSet.ObjectChanges.FirstOrDefault(x => x.PropertyChanges.Any(y => y.PropertyName == "Title" && y.Value == HowToLearnFrenchPart1));
var frenchPart2ObjectChange = changeSet.ObjectChanges.FirstOrDefault(x => x.PropertyChanges.Any(y => y.PropertyName == "Title" && y.Value == HowToLearnFrenchPart2));
Assert.IsNotNull(frenchPart1ObjectChange, "Expected changes to be logged for french (part 1), but there were none");
Assert.IsNotNull(frenchPart2ObjectChange, "Expected changes to be logged for french (part 2), but there were none");
}
public void NoErrorIsThrownIfExplicitTransactionIsPassedToFrameLog()
{
using (var transaction = db.Database.BeginTransaction())
{
var book = new Book() { Title = "Title" };
db.Books.Add(book);
Assert.DoesNotThrow(() => db.Logger.SaveChangesWithinExplicitTransaction(user));
transaction.Rollback();
}
}
/// <summary>
/// We check that the changes that FrameLog makes to the database are really
/// wrapped in the transaction scope we wrapped the save changes call in.
///
/// We do this by, during the transaction, opening a new transaction scope
/// with TransactionScopeOption.Suppress. This means that the code inside
/// this scope takes place outside the current transaction.
/// </summary>
private void checkTransactionScope(TransactionOptions options)
{
Book book = new Book() { Title = "Title" };
using (var transaction = new TransactionScope(TransactionScopeOption.Required, options))
{
db.Books.Add(book);
db.Logger.SaveChanges(user, options);
using (var outsideTransaction = new TransactionScope(TransactionScopeOption.Suppress))
{
// We can't see the change from outside the transaction
Assert.IsNull(db.Books.SingleOrDefault(b => b.Id == book.Id));
}
transaction.Complete();
}
Assert.IsNotNull(db.Books.SingleOrDefault(b => b.Id == book.Id));
}
private bool compare(Book a, Book b)
{
return a.Title == b.Title
&& a.NumberOfFans == b.NumberOfFans
&& a.Sequel == b.Sequel
&& a.Style.Hardcover == b.Style.Hardcover;
}
