wait for signal based on parameters

[bitwes]

Versions

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latest

The Feature

Add the ability to wait for a signal to be emitted with specified parameter values. This should probably be done with another method instead of complicating the argument list for wait_for_signal.

Example:

func test_switches_to_idle_state_after_attack():
    var player = add_child_autofree(Player.new())
    player.attack()
    # wait up to 5 seconds for the state machine to change state to idle.
    await wait_for_signal_with_parameters(player.state_machine.state_changed, ['idle'], 5)