LibWeb: Add tests for Gamepad API by utilising virtual SDL3 joysticks

Author: https://github.com/Lubrsi
Commit: 9adf27f009
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5902
Reviewed-by: https://github.com/gmta
Reviewed-by: https://github.com/trflynn89

Tests/LibWeb/Text/input/GamepadAPI/gamepad-helper.js

@@ -0,0 +1,44 @@
+(() => {
+    globalThis.handleSDLInputEvents = () => {
+        internals.handleSDLInputEvents();
+        return new Promise(resolve => {
+            setTimeout(() => resolve(), 0);
+        });
+    };
+
+    globalThis.getStringifiedGamepads = () => {
+        const gamepads = navigator.getGamepads().map(gamepad => ({
+            id: gamepad.id,
+            index: gamepad.index,
+            connected: gamepad.connected,
+            mapping: gamepad.mapping,
+            axes: gamepad.axes,
+            buttons: gamepad.buttons.map(button => ({
+                pressed: button.pressed,
+                touched: button.touched,
+                value: button.value,
+            })),
+            vibrationActuator: {
+                effects: gamepad.vibrationActuator.effects,
+            },
+        }));
+
+        return JSON.stringify(gamepads);
+    };
+
+    globalThis.listenForGamepadConnected = () => {
+        window.addEventListener("gamepadconnected", ({ gamepad }) => {
+            println(
+                `Received gamepadconnected event for '${gamepad.id}' at index ${gamepad.index}`
+            );
+        });
+    };
+
+    globalThis.listenForGamepadDisconnected = () => {
+        window.addEventListener("gamepaddisconnected", ({ gamepad }) => {
+            println(
+                `Received gamepaddisconnected event for '${gamepad.id}' at index ${gamepad.index}`
+            );
+        });
+    };
+})();