chore: add GUT test framework

addons/gut/scratch/test_35_input_sender.gd

@@ -0,0 +1,54 @@
+extends SceneTree
+# In 3.5 Input.use_accumulated_input has been enabled by default.  In 3.4 it was
+# disabled even though the documentation indicated it was enabled.  In order for
+# Input to fire all events as they are sent through an InputSender you must either
+# disable use_accumulated_input or call Input.flush_buffered_events() before
+# you check that an input was handled correctly.
+#
+# For all checks other than is_action_just_pressed and is_action_just_released,
+# yeilding before checking will also work.  The *just* methods require that you
+# either disable accumulated input or flush the buffer so that checks fire
+# on the same frame.
+
+var InputSender = load('res://addons/gut/input_sender.gd')
+
+func test_input_vanilla():
+    # -- Action checks --
+    var action_event = InputEventAction.new()
+    action_event.action = 'jump'
+    action_event.pressed = true
+
+    Input.parse_input_event(action_event)
+    Input.flush_buffered_events()
+    print("jump pressed = ", Input.is_action_pressed('jump'))
+    print("jump just pressed = ", Input.is_action_just_pressed('jump'))
+
+    # -- Key checks --
+    var key_event = InputEventKey.new()
+    key_event.pressed = true
+    key_event.scancode = KEY_Y
+
+    Input.parse_input_event(key_event)
+    Input.flush_buffered_events()
+    print('Y pressed = ', Input.is_key_pressed(KEY_Y))
+
+
+func test_auto_flush():
+    var sender = InputSender.new(Input)
+    sender._auto_flush_input = false
+
+    var action_event = InputEventAction.new()
+    action_event.action = 'jump'
+    action_event.pressed = true
+
+    sender.send_event(action_event)
+    print("jump pressed = ", Input.is_action_pressed('jump'))
+    print("jump just pressed = ", Input.is_action_just_pressed('jump'))
+
+
+func _init():
+    # Input.use_accumulated_input = false
+    InputMap.add_action("jump")
+    test_auto_flush()
+
+    quit()