chore: add GUT test framework

addons/gut/test/unit/test_simple.gd

@@ -0,0 +1,59 @@
+extends GutTest
+
+class DoubleThis:
+	extends Node2D
+
+	func get_something():
+		return 'something'
+
+var DoubleMe = load('res://test/resources/doubler_test_objects/double_me.gd')
+
+func before_all():
+	pass
+	# gut.get_doubler()._print_source = true
+
+
+func test_assert_true():
+	assert_true(true, 'this is true')
+
+
+# func test_making_double_of_string():
+# 	var d = double('res://test/resources/doubler_test_objects/double_me.gd')
+# 	assert_not_null(d)
+# 	var d_inst = d.new()
+# 	assert_not_null(d_inst)
+
+
+# func test_making_partial_double_of_string():
+# 	var d = partial_double('res://test/resources/doubler_test_objects/double_me.gd')
+# 	assert_not_null(d)
+# 	var d_inst = d.new()
+# 	assert_not_null(d_inst)
+
+# func  test_make_double_of_loaded_thing():
+# 	var Dbl = double(DoubleMe)
+# 	assert_not_null(Dbl)
+# 	var d_inst = Dbl.new()
+# 	assert_not_null(d_inst)
+
+# func  test_make_partial_double_of_loaded_thing():
+# 	var Dbl = partial_double(DoubleMe)
+# 	assert_not_null(Dbl)
+# 	var d_inst = Dbl.new()
+# 	assert_not_null(d_inst)
+# 	assert_not_null(d_inst.__gut_metadata_.path)
+
+# func test_can_stub_a_method_making_double_of_string():
+# 	var d = double('res://test/resources/doubler_test_objects/double_me.gd')
+# 	assert_not_null(d)
+# 	var d_inst = d.new()
+# 	assert_not_null(d_inst)
+# 	stub(d_inst, 'get_value').to_return('poop')
+# 	assert_eq(d_inst.get_value(), 'poop')
+
+# func test_can_watch_signals():
+# 	var dbl_me = DoubleMe.new()
+# 	watch_signals(dbl_me)
+# 	dbl_me.emit_signal('signal_signal')
+# 	assert_signal_emitted(dbl_me, 'signal_signal')
+