public static async Task TestConcurrentAccountUpdate()
{
// Initialize the mock in-memory DB and account manager.
var dbCollection = new InMemoryDbCollection();
var accountManager = new AccountManager(dbCollection);
string accountName = "MyAccount";
// Create the account, it should complete successfully and return true.
var result = await accountManager.CreateAccount(accountName, "first_version", 1);
Assert.True(result);
// Call UpdateAccount twice without awaiting, which makes both methods run
// asynchronously with each other.
var task1 = accountManager.UpdateAccount(accountName, "second_version", 2);
var task2 = accountManager.UpdateAccount(accountName, "second_version_alt", 2);
// Then wait both requests to complete.
await Task.WhenAll(task1, task2);
// Finally, assert that only one of the two requests succeeded and the other
// failed. Note that we do not know which one of the two succeeded as the
// requests ran concurrently (this is why we use an exclusive OR).
Assert.True(task1.Result ^ task2.Result);
}
public static async Task TestGetAccountAfterConcurrentUpdate()
{
// Initialize the mock in-memory DB and account manager.
var dbCollection = new InMemoryDbCollection();
var accountManager = new AccountManager(dbCollection);
string accountName = "MyAccount";
// Create the account, it should complete successfully and return true.
var result = await accountManager.CreateAccount(accountName, "first_version", 1);
Assert.True(result);
// Call UpdateAccount twice without awaiting, which makes both methods run
// asynchronously with each other.
var task1 = accountManager.UpdateAccount(accountName, "second_version", 2);
var task2 = accountManager.UpdateAccount(accountName, "third_version", 3);
// Then wait both requests to complete.
await Task.WhenAll(task1, task2);
// Finally, get the account and assert that the version is always 3,
// which is the latest updated version.
var account = await accountManager.GetAccount(accountName);
Assert.True(account.Version == 3);
}
public static async Task TestAccountUpdate()
{
// Initialize the mock in-memory DB and account manager.
var dbCollection = new InMemoryDbCollection();
var accountManager = new AccountManager(dbCollection);
string accountName = "MyAccount";
// Create the account, it should complete successfully and return true.
var result = await accountManager.CreateAccount(accountName, "first_version", 1);
Assert.True(result);
result = await accountManager.UpdateAccount(accountName, "second_version", 2);
Assert.True(result);
result = await accountManager.UpdateAccount(accountName, "second_version_alt", 2);
Assert.False(result);
}
