feat(editor): provide yaml validation for docker compose in the portainer web editor [BE-11697] (#526)

app/setup-tests/setup-codemirror.ts

@@ -0,0 +1,42 @@
+import 'vitest-dom/extend-expect';
+
+// Mock Range APIs that CodeMirror needs but JSDOM doesn't provide
+Range.prototype.getBoundingClientRect = () => ({
+  bottom: 0,
+  height: 0,
+  left: 0,
+  right: 0,
+  top: 0,
+  width: 0,
+  x: 0,
+  y: 0,
+  toJSON: vi.fn(),
+});
+
+Range.prototype.getClientRects = () => ({
+  item: () => null,
+  length: 0,
+  [Symbol.iterator]: vi.fn(),
+});
+
+// Mock createRange
+document.createRange = () => {
+  const range = new Range();
+  range.getBoundingClientRect = vi.fn();
+  range.getClientRects = () => ({
+    item: () => null,
+    length: 0,
+    [Symbol.iterator]: vi.fn(),
+  });
+  return range;
+};
+
+// Mock selection APIs
+const mockSelection = {
+  rangeCount: 0,
+  addRange: vi.fn(),
+  getRangeAt: vi.fn(),
+  removeAllRanges: vi.fn(),
+};
+
+window.getSelection = () => mockSelection as unknown as Selection;