chore(client): add gdUnit4 test framework addon

Vendor gdUnit4 for Godot 4 client testing (D-030).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/addons/gdUnit4/test/core/command/GdUnitCommandHandlerTest.gd

@@ -0,0 +1,45 @@
+@warning_ignore_start("unsafe_method_access")
+# GdUnit generated TestSuite
+extends GdUnitTestSuite
+
+
+var _handler :GdUnitCommandHandler
+
+
+func before() -> void:
+	_handler = GdUnitCommandHandler.new()
+
+
+func after() -> void:
+	_handler.free()
+
+
+func test_command_shortcut() -> void:
+	assert_str(_handler.command_shortcut(GdUnitCommandInspectorRunTests.ID).get_as_text()).is_equal("Alt+F5")
+	assert_str(_handler.command_shortcut(GdUnitCommandInspectorDebugTests.ID).get_as_text()).is_equal("Alt+F6")
+	assert_str(_handler.command_shortcut(GdUnitCommandRunTestsOverall.ID).get_as_text()).is_equal("Alt+F7")
+	assert_str(_handler.command_shortcut(GdUnitCommandStopTestSession.ID).get_as_text()).is_equal("Alt+F8")
+	assert_str(_handler.command_shortcut(GdUnitCommandScriptEditorRunTests.ID).get_as_text()).is_equal("Ctrl+Alt+F5")
+	assert_str(_handler.command_shortcut(GdUnitCommandScriptEditorDebugTests.ID).get_as_text()).is_equal("Ctrl+Alt+F6")
+	assert_str(_handler.command_shortcut(GdUnitCommandScriptEditorCreateTest.ID).get_as_text()).is_equal("Ctrl+Alt+F10")
+	if Engine.get_version_info().hex >= 0x40600:
+		assert_str(_handler.command_shortcut(GdUnitCommandFileSystemRunTests.ID).get_as_text()).is_equal("Alt+Shift+F5")
+		assert_str(_handler.command_shortcut(GdUnitCommandFileSystemDebugTests.ID).get_as_text()).is_equal("Alt+Shift+F6")
+	else:
+		assert_str(_handler.command_shortcut(GdUnitCommandFileSystemRunTests.ID).get_as_text()).is_equal("Shift+Alt+F5")
+		assert_str(_handler.command_shortcut(GdUnitCommandFileSystemDebugTests.ID).get_as_text()).is_equal("Shift+Alt+F6")
+
+
+## actually needs to comment out, it produces a lot of leaked instances
+func _test__check_test_run_stopped_manually() -> void:
+	var inspector :GdUnitCommandHandler = mock(GdUnitCommandHandler, CALL_REAL_FUNC)
+
+	# simulate no test is running
+	do_return(false).on(inspector).is_test_running_but_stop_pressed()
+	inspector.check_test_run_stopped_manually()
+	verify(inspector, 0).cmd_stop(any_int())
+
+	# simulate the test runner was manually stopped by the editor
+	do_return(true).on(inspector).is_test_running_but_stop_pressed()
+	inspector.check_test_run_stopped_manually()
+	verify(inspector, 1).cmd_stop()

client/addons/gdUnit4/test/core/command/GdUnitCommandHandlerTest.gd.uid

@@ -0,0 +1 @@
+uid://grbqo22lpca6

client/addons/gdUnit4/test/core/command/GdUnitShortcutTest.gd

@@ -0,0 +1,15 @@
+# GdUnit generated TestSuite
+class_name GdUnitShortcutTest
+extends GdUnitTestSuite
+@warning_ignore('unused_parameter')
+@warning_ignore('return_value_discarded')
+
+# TestSuite generated from
+const __source: String = 'res://addons/gdUnit4/src/core/command/GdUnitShortcut.gd'
+
+
+func test_default_keys() -> void:
+	match OS.get_name().to_lower():
+		'windows':
+			assert_array(GdUnitShortcut.default_keys(GdUnitShortcut.ShortCut.NONE)).is_empty()
+			assert_array(GdUnitShortcut.default_keys(GdUnitShortcut.ShortCut.RUN_TESTSUITE_DEBUG)).contains_exactly(Key.KEY_ALT, Key.KEY_SHIFT, Key.KEY_F6)

client/addons/gdUnit4/test/core/command/GdUnitShortcutTest.gd.uid

@@ -0,0 +1 @@
+uid://cd2ijw315bdif