1 files changed, 24 insertions, 0 deletions

diff --git a/spec/frontend/issues/show/utils/update_description_spec.js b/spec/frontend/issues/show/utils/update_description_spec.js
new file mode 100644
index 00000000000..f4afef8af12
--- /dev/null
+++ b/spec/frontend/issues/show/utils/update_description_spec.js
@@ -0,0 +1,24 @@
+import updateDescription from '~/issues/show/utils/update_description';
+
+describe('updateDescription', () => {
+  it('returns the correct value to be set as descriptionHtml', () => {
+    const actual = updateDescription(
+      '<details><summary>One</summary></details><details><summary>Two</summary></details>',
+      [{ open: true }, { open: false }], // mocking NodeList from the dom.
+    );
+
+    expect(actual).toEqual(
+      '<details open="true"><summary>One</summary></details><details><summary>Two</summary></details>',
+    );
+  });
+
+  describe('when description details returned from api is different then whats currently on the dom', () => {
+    it('returns the description from the api', () => {
+      const dataDescription = '<details><summary>One</summary></details>';
+
+      const actual = updateDescription(dataDescription, []);
+
+      expect(actual).toEqual(dataDescription);
+    });
+  });
+});