class Program
{

    static void Main()
    {
        var container = new UnityContainer();

        //the instance to be injected
        var systemClient = new JobSystemClient
        {
            UserName = "admin",
            PassWord = "admin1234"
        };

        container.RegisterInstance<ISystemClient>(systemClient);

        //Registration of the Functions class
        container.RegisterType<Functions>();

        var activator = new UnityJobActivator(container);

        var config = new JobHostConfiguration();
        config.JobActivator = activator;

        var host = new JobHost(config);
        // The following code will invoke a function called ManualTrigger and
        // pass in data (value in this case) to the function
        host.Call(typeof(Functions).GetMethod("ManualTrigger"), new { value = 20 });

        host.RunAndBlock();

    }
}

public class Functions
{
    private readonly ISystemClient _systemClient;
    public Functions(ISystemClient systemClient)
    {
        _systemClient = systemClient;
    }

    //Not static anymore
    [NoAutomaticTrigger]
    public void ManualTrigger(TextWriter log, int value, [Queue("queue")] out string message)
    {
        log.WriteLine("Function is invoked with value={0}", value);
        message = value.ToString();
        log.WriteLine("username:{0} and password:{1}", _systemClient.UserName, _systemClient.PassWord);
    }
}

Found the following functions:
TestWebJob.Functions.ManualTrigger
Executing 'Functions.ManualTrigger' (Reason='This function was programmatically called via the host APIs.', Id=bf9aedc0-89d1-4ba0-a33e-9b23e0d7b8a2)
Function is invoked with value=20
Following message will be written on the Queue=20
username:admin and password:admin1234
Executed 'Functions.ManualTrigger' (Succeeded, Id=bf9aedc0-89d1-4ba0-a33e-9b23e0d7b8a2)
Job host started