1 files changed, 71 insertions, 0 deletions
diff --git a/spec/frontend/__helpers__/dom_shims/get_client_rects_spec.js b/spec/frontend/__helpers__/dom_shims/get_client_rects_spec.js
new file mode 100644
index 00000000000..e7b8f1e235b
--- /dev/null
+++ b/spec/frontend/__helpers__/dom_shims/get_client_rects_spec.js
@@ -0,0 +1,71 @@
+const createTestElement = () => {
+  const element = document.createElement('div');
+
+  element.textContent = 'Hello World!';
+
+  return element;
+};
+
+describe('DOM patch for getClientRects', () => {
+  let origHtml;
+  let el;
+
+  beforeEach(() => {
+    origHtml = document.body.innerHTML;
+    el = createTestElement();
+  });
+
+  afterEach(() => {
+    document.body.innerHTML = origHtml;
+  });
+
+  describe('toBeVisible matcher', () => {
+    describe('when not attached to document', () => {
+      it('does not match', () => {
+        expect(el).not.toBeVisible();
+      });
+    });
+
+    describe('when attached to document', () => {
+      beforeEach(() => {
+        document.body.appendChild(el);
+      });
+
+      it('matches', () => {
+        expect(el).toBeVisible();
+      });
+    });
+
+    describe('with parent and attached to document', () => {
+      let parentEl;
+
+      beforeEach(() => {
+        parentEl = createTestElement();
+        parentEl.appendChild(el);
+        document.body.appendChild(parentEl);
+      });
+
+      it('matches', () => {
+        expect(el).toBeVisible();
+      });
+
+      describe.each`
+        style
+        ${{ display: 'none' }}
+        ${{ visibility: 'hidden' }}
+      `('with style $style', ({ style }) => {
+        it('does not match when applied to element', () => {
+          Object.assign(el.style, style);
+
+          expect(el).not.toBeVisible();
+        });
+
+        it('does not match when applied to parent', () => {
+          Object.assign(parentEl.style, style);
+
+          expect(el).not.toBeVisible();
+        });
+      });
+    });
+  });
+});