chore: add GUT test framework

addons/gut/test/resources/state_check_tests.gd

@@ -0,0 +1,78 @@
+# This script is used by test_test.gd/TestTestStateChecking.
+# Each of these tests are run by that test class and the
+# pass/fail count is checked.
+extends GutTest
+
+class TestIsPassing:
+	extends GutTest
+
+	func test_is_passing_returns_true_when_test_is_passing():
+		assert_true(true, 'should pass')
+		assert_true(is_passing(), 'should pass')
+
+	func test_is_passing_returns_false_when_test_is_failing():
+		assert_true(false, 'should fail')
+		assert_false(is_passing(), 'should pass')
+
+	func test_is_passing_false_by_default():
+		assert_false(is_passing(), 'this should pass')
+
+	func test_is_passing_returns_true_before_test_fails():
+		assert_true(true, 'should pass')
+		assert_true(is_passing(), 'should pass')
+		assert_true(false, 'should fail')
+
+class TestIsFailing:
+	extends GutTest
+
+	func test_is_failing_returns_true_when_failing():
+		assert_false(true, 'should fail')
+		assert_true(is_failing(), 'should pass')
+
+	func test_is_failing_returns_false_when_passing():
+		assert_true(true, 'should pass')
+		assert_false(is_failing(), 'should pass')
+
+	func test_is_failing_returns_false_by_default():
+		assert_false(is_failing())
+
+	func test_is_failing_returns_false_before_test_passes():
+		assert_false(is_failing(), 'should pass')
+		assert_true(true, 'should pass')
+
+class TestUseIsPassingInBeforeAll:
+	extends GutTest
+
+	func before_all():
+		var is_it = is_passing()
+
+	func test_nothing():
+		pass_test('pass it')
+
+class TestUseIsPassingInAfterAll:
+	extends GutTest
+
+	func after_all():
+		var is_it = is_passing()
+
+	func test_nothing():
+		pass_test('pass it')
+
+
+class TestUseIsFailingInBeforeAll:
+	extends GutTest
+
+	func before_all():
+		var is_it = is_failing()
+
+	func test_nothing():
+		pass_test('pass it')
+
+class TestUseIsFailingInAfterAll:
+	extends GutTest
+
+	func after_all():
+		var is_it = is_failing()
+
+	func test_nothing():
+		pass_test('pass it')