Add sample unit test script and test directories

game/tests/test.tscn

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+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://addons/gut/gut.gd" type="Script" id=1]
+[ext_resource path="res://addons/gut/icon.png" type="Texture" id=2]
+
+[node name="Gut" type="WindowDialog" index="0"]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 0.0
+anchor_bottom = 0.0
+margin_right = 48.0
+margin_bottom = 40.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+mouse_filter = 0
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 1
+size_flags_vertical = 1
+popup_exclusive = false
+window_title = ""
+resizable = false
+script = ExtResource( 1 )
+__meta__ = {
+"_editor_icon": ExtResource( 2 )
+}
+_run_on_load = false
+_select_script = null
+_tests_like = null
+_should_print_to_console = true
+_log_level = 1
+_yield_between_tests = true
+_disable_strict_datatype_checks = false
+_test_prefix = "test_"
+_file_prefix = "test_"
+_file_extension = ".gd"
+_directory1 = "res://tests/unit"
+_directory2 = "res://tests/integration"
+_directory3 = ""
+_directory4 = ""
+_directory5 = ""
+_directory6 = ""
+
+

game/tests/unit/test_example.gd

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+extends "res://addons/gut/test.gd"
+# @see https://github.com/bitwes/Gut#creating_tests
+var node = null;
+
+func setup():
+	var n = preload('res://tests/test-2d.tscn')
+	node = n.instance()
+
+func test_node_has_exit_button():
+	var b = node.get_node('CenterContainer/exit')
+	assert_true(b != null, 'CenterContainer/exit is not null')
+	if (b):
+		assert_true(b.get_class() == 'Button', 'CenterContainer/exit is a Button')
+		var connected = gut.p(b.get_signal_connection_list('pressed'))
+		assert_true(connected != [], 'CenterContainer/exit has connected signals')
+