1 files changed, 52 insertions, 0 deletions
diff --git a/spec/frontend/__helpers__/dom_shims/get_client_rects.js b/spec/frontend/__helpers__/dom_shims/get_client_rects.js
new file mode 100644
index 00000000000..7ba60dd7936
--- /dev/null
+++ b/spec/frontend/__helpers__/dom_shims/get_client_rects.js
@@ -0,0 +1,52 @@
+function hasHiddenStyle(node) {
+  if (!node.style) {
+    return false;
+  } else if (node.style.display === 'none' || node.style.visibility === 'hidden') {
+    return true;
+  }
+
+  return false;
+}
+
+function createDefaultClientRect(node) {
+  const { outerWidth: width, outerHeight: height } = node;
+
+  return {
+    bottom: height,
+    height,
+    left: 0,
+    right: width,
+    top: 0,
+    width,
+    x: 0,
+    y: 0,
+  };
+}
+
+/**
+ * This is needed to get the `toBeVisible` matcher to work in `jsdom`
+ *
+ * Reference:
+ * - https://github.com/jsdom/jsdom/issues/1322
+ * - https://github.com/unindented/custom-jquery-matchers/blob/v2.1.0/packages/custom-jquery-matchers/src/matchers.js#L157
+ */
+window.Element.prototype.getClientRects = function getClientRects() {
+  let node = this;
+
+  while (node) {
+    if (node === document) {
+      break;
+    }
+
+    if (hasHiddenStyle(node)) {
+      return [];
+    }
+    node = node.parentNode;
+  }
+
+  if (!node) {
+    return [];
+  }
+
+  return [createDefaultClientRect(node)];
+};