public async Task TestDonateTokens()
{
User userSelf = MockUser("Self");
User userRecipient = MockUser("Recipient");
_userRepoMock.Setup(r => r.FindBySimpleName(userRecipient.SimpleName))
.Returns(Task.FromResult((User?)userRecipient));
_tokenBankMock.Setup(b => b.GetAvailableMoney(userSelf)).Returns(Task.FromResult(1L));
List <IEnumerable <Transaction <User> > > txInvocations = new();
_tokenBankMock.Setup(b => b.PerformTransactions(Capture.In(txInvocations), It.IsAny <CancellationToken>()));
CommandResult result = await _userCommands.Donate(new CommandContext(MockMessage(userSelf),
ImmutableList.Create("T1", "Recipient"), _argsParser));
Assert.AreEqual("has donated T1 to @Recipient!", result.Response);
List <Transaction <User> > txs = txInvocations.SelectMany(t => t).ToList();
CollectionAssert.AreEquivalent(new List <Transaction <User> >
{
new(userSelf, -1, "donation_give"),
new(userRecipient, 1, "donation_recieve"),
}, txs);
