chore: establish learning module baseline

OpenMAIC/packages/@openmaic/renderer/test/setup.ts

@@ -0,0 +1,28 @@
+/**
+ * Shared test setup. jsdom does not implement ResizeObserver, which the v1
+ * SlideCanvas depends on via `useViewportSize`; provide a no-op polyfill so
+ * component tests that mount SlideCanvas (e.g. EditableSlideCanvas) can render.
+ * Harmless under the node environment used by the pure-core tests.
+ */
+if (typeof globalThis.ResizeObserver === 'undefined') {
+  class ResizeObserverStub {
+    constructor(callback: ResizeObserverCallback) {
+      void callback;
+    }
+    observe(): void {}
+    unobserve(): void {}
+    disconnect(): void {}
+  }
+  globalThis.ResizeObserver = ResizeObserverStub as unknown as typeof ResizeObserver;
+}
+
+// ProseMirror reads Range geometry when it scrolls a restored selection into
+// view. jsdom has no layout engine, so expose stable empty geometry in tests.
+if (typeof globalThis.Range !== 'undefined') {
+  if (!globalThis.Range.prototype.getClientRects) {
+    globalThis.Range.prototype.getClientRects = () => [] as unknown as DOMRectList;
+  }
+  if (!globalThis.Range.prototype.getBoundingClientRect) {
+    globalThis.Range.prototype.getBoundingClientRect = () => new DOMRect();
+  }
+}