test: add API mock, fixtures, and DOM helpers for tests

tests/helpers/render.ts

@@ -0,0 +1,55 @@
+// Setup happy-dom + wrapper render pour les tests de composants Preact
+
+import { Window } from "happy-dom";
+
+let _window: Window | null = null;
+
+/**
+ * Initialise un environnement DOM virtuel via happy-dom.
+ * À appeler avant de rendre des composants Preact dans les tests.
+ */
+export function setupDOM(): void {
+  _window = new Window({ url: "http://localhost" });
+
+  // Expose les globals DOM nécessaires à Preact
+  const globals = _window as unknown as Record<string, unknown>;
+  const target = globalThis as unknown as Record<string, unknown>;
+
+  for (
+    const key of [
+      "document",
+      "navigator",
+      "location",
+      "HTMLElement",
+      "HTMLInputElement",
+      "HTMLTextAreaElement",
+      "HTMLSelectElement",
+      "Event",
+      "CustomEvent",
+      "KeyboardEvent",
+      "MouseEvent",
+      "InputEvent",
+      "MutationObserver",
+      "requestAnimationFrame",
+      "cancelAnimationFrame",
+    ]
+  ) {
+    target[key] = globals[key];
+  }
+
+  target["window"] = _window;
+}
+
+/**
+ * Nettoie l'environnement DOM.
+ * À appeler dans un afterEach ou à la fin d'un test.
+ */
+export function cleanupDOM(): void {
+  if (_window) {
+    const doc = _window.document;
+    doc.body.innerHTML = "";
+    doc.head.innerHTML = "";
+    _window.close();
+    _window = null;
+  }
+}