public void RegisterReceiver_ValidExistingReceiver_RegistrationException()
{
// Arrange
MessageSystem messageSystem = new MessageSystem();
messageSystem.RegisterReceiver <IMessage>(HandleMessage);
// Act / Assert
Assert.Throws <RegistrationException>(() => messageSystem.RegisterReceiver <IMessage>(HandleMessage));
}
public void RegisterReceiver_Null_ArgumentNullException()
{
// Arrange
MessageSystem messageSystem = new MessageSystem();
// Act / Assert
Assert.Throws <ArgumentNullException>(() => messageSystem.RegisterReceiver <IMessage>(null));
}
public void RegisterReceiver_ValidNonExistingReceiver_Successful()
{
// Arrange
MessageSystem messageSystem = new MessageSystem();
// Act
messageSystem.RegisterReceiver <IMessage>(HandleMessage);
// Assert
Assert.Single(messageSystem.Receiver);
}
public void UnregisterReceiver_ValidExistingReceiver_Successful()
{
// Arrange
MessageSystem messageSystem = new MessageSystem();
messageSystem.RegisterReceiver <IMessage>(HandleMessage);
// Act
messageSystem.UnregisterReceiver <IMessage>(HandleMessage);
// Assert
Assert.Empty(messageSystem.Receiver);
}
public async void ProcessMessages_Successful()
{
// Arrange
MessageSystem messageSystem = new MessageSystem();
UnitTestMessage message = new UnitTestMessage();
messageSystem.RegisterReceiver <UnitTestMessage>(HandleMessage);
messageSystem.SendMessage(message);
// Act
await messageSystem.ProcessMessagesAsync();
// Assert
Assert.Empty(messageSystem.ActiveMessages);
Assert.True(callbackExecuted);
}
