chore: add GUT test framework

addons/gut/test/resources/exporter_test_files/test_has_error_and_warning.gd

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+extends GutTest
+
+func test_manual_error():
+	gut.logger.error("This is a manual error")
+	pass_test('we did it')
+
+func test_manual_warning():
+	gut.logger.warn("This is a manual warning")
+	pass_test('we did it')

addons/gut/test/resources/exporter_test_files/test_has_error_and_warning.gd.uid

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+uid://b7cwum48use88

addons/gut/test/resources/exporter_test_files/test_simple.gd

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+extends 'res://addons/gut/test.gd'
+
+func test_pass_1():
+	assert_eq('one', 'one')
+
+func test_pass_2():
+	assert_eq('two', 'two')
+
+func test_fail_1():
+	assert_eq(1, 'two')
+
+func test_fail_2():
+	assert_eq('two', 2)
+
+func test_pending_no_text():
+	pending()
+
+func test_pending_with_text():
+	pending('this has text')
+
+func test_parameterized_passing(p=use_parameters([1, 2, 3, 4])):
+	assert_gt(p, 0)
+
+func test_parameterized_failing(p = use_parameters([[1, 2], [3, 4]])):
+	assert_eq(p[0], p[1])

addons/gut/test/resources/exporter_test_files/test_simple.gd.uid

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+uid://b6pnje22lv3hj

addons/gut/test/resources/exporter_test_files/test_simple_2.gd

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+extends 'res://addons/gut/test.gd'
+
+func test_pass():
+	assert_eq('one', 'one')
+
+func test_fail():
+	assert_eq(1, 'two')
+
+func test_pending():
+	pending('this has text')
+

addons/gut/test/resources/exporter_test_files/test_simple_2.gd.uid

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+uid://cjsptipvnesa1

addons/gut/test/resources/exporter_test_files/test_special_chars_in_test_output.gd

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+extends GutTest
+
+
+func test_pending_with_null_message():
+	pending("The < and > in this message mess up the XML")
+
+func test_failure_message_includes_str_of_null_in_message_1():
+	assert_not_null(null)
+
+func test_failure_message_includes_str_of_null_in_message_2():
+	assert_eq('null', str(null))
+
+func test_failure_message_includes_str_of_null_in_message_3():
+	assert_eq('a', 'b', "The < and > in this message mess up the XML")
+
+class TestSkipWithNullMessage:
+	extends GutTest
+
+	func should_skip():
+		return null
+
+	func test_something_that_is_skipped():
+		assert_true(false, 'hello world')
+
+

addons/gut/test/resources/exporter_test_files/test_special_chars_in_test_output.gd.uid

@@ -0,0 +1 @@
+uid://k2sec8vc8qfb

addons/gut/test/resources/exporter_test_files/test_time_taken.gd

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+extends 'res://addons/gut/test.gd'
+
+func more_accurate_wait_time(time_to_wait_msec : int)->void:
+	gut.p(str('-- Awaiting ', time_to_wait_msec / 1000.0, ' second(s) -- '))
+	var start := Time.get_ticks_msec()
+	while (Time.get_ticks_msec() - start < time_to_wait_msec):
+		await get_tree().process_frame
+
+func test_pass_time_taken_about_half_s():
+	await more_accurate_wait_time(500)
+	assert_eq('one', 'one')
+
+func test_fail_time_taken_about_half_s():
+	await more_accurate_wait_time(500)
+	assert_eq(1, 'two')
+
+func test_pending_time_taken_about_half_s():
+	await more_accurate_wait_time(500)
+	pending('this has text')
+
+func test_pass_time_taken_about_2s():
+	await more_accurate_wait_time(2000)
+	assert_eq('one', 'one')

addons/gut/test/resources/exporter_test_files/test_time_taken.gd.uid

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+uid://c3xtlyqvys7ls

addons/gut/test/resources/exporter_test_files/test_with_inner_classes.gd

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+extends 'res://addons/gut/test.gd'
+
+
+class TestClassOne:
+	extends 'res://addons/gut/test.gd'
+
+	func test_pass_1():
+		assert_eq('one', 'one')
+
+	func test_fail_1():
+		assert_eq(1, 'two')
+
+	func test_pending_with_text():
+		pending('this has text')
+
+
+
+
+class TestClassTwo:
+	extends 'res://addons/gut/test.gd'
+
+	func test_pass_1():
+		assert_eq('one', 'one')
+
+	func test_fail_1():
+		assert_eq(1, 'two')
+
+	func test_pending_with_text():
+		pending('this has text')
+

addons/gut/test/resources/exporter_test_files/test_with_inner_classes.gd.uid

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+uid://dikra3pwwycgc