chore: add GUT test framework

addons/gut/test/resources/summary_test_scripts/test_risky_and_passing.gd

@@ -0,0 +1,17 @@
+extends GutTest
+
+
+func test_this_passes():
+    pass_test('passing')
+
+func test_this_also_passes():
+    assert_eq(1, 1, 'one')
+
+func test_this_is_pending():
+    pending('')
+
+func test_this_does_nothing():
+    pass
+
+func test_another_pass():
+    assert_true(true, 'true')

addons/gut/test/resources/summary_test_scripts/test_risky_and_passing.gd.uid

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+uid://b07xl8307vui4

addons/gut/test/resources/summary_test_scripts/test_tests_with_issues.gd

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+extends GutTest
+
+func test_this_causes_an_error_and_passes():
+    _lgr.error('There was an error here')
+    pass_test('passes')
+
+func test_this_causes_an_error_and_fails():
+    _lgr.error('another error here')
+    fail_test('this fails')
+
+func test_this_causes_an_orphan_and_passes():
+    var n = Node.new()
+    pass_test('passes')
+
+func test_this_causes_a_warning_and_passes():
+    _lgr.warn('A new warning')
+    pass_test('passing')
+
+func test_this_causes_a_warning_and_fails():
+    _lgr.warn('Another warning')
+    fail_test('failing')
+
+func test_this_causes_a_deprecation_and_passes():
+    _lgr.deprecated('this thing should not be used anymore')
+    pass_test('passing')
+
+func test_this_causes_a_deprecation_and_fails():
+    _lgr.deprecated('this thing should not be used anymore')
+    fail_test('passing')

addons/gut/test/resources/summary_test_scripts/test_tests_with_issues.gd.uid

@@ -0,0 +1 @@
+uid://cjxx4swxk6tdf