1 files changed, 72 insertions, 0 deletions
diff --git a/spec/frontend/notes/components/sort_discussion_spec.js b/spec/frontend/notes/components/sort_discussion_spec.js
new file mode 100644
index 00000000000..785e8c75233
--- /dev/null
+++ b/spec/frontend/notes/components/sort_discussion_spec.js
@@ -0,0 +1,72 @@
+import { shallowMount, createLocalVue } from '@vue/test-utils';
+import Vuex from 'vuex';
+import SortDiscussion from '~/notes/components/sort_discussion.vue';
+import createStore from '~/notes/stores';
+import { ASC, DESC } from '~/notes/constants';
+
+const localVue = createLocalVue();
+localVue.use(Vuex);
+
+describe('Sort Discussion component', () => {
+  let wrapper;
+  let store;
+
+  const createComponent = () => {
+    jest.spyOn(store, 'dispatch').mockImplementation();
+
+    wrapper = shallowMount(SortDiscussion, {
+      localVue,
+      store,
+    });
+  };
+
+  beforeEach(() => {
+    store = createStore();
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+  });
+
+  describe('when asc', () => {
+    describe('when the dropdown is clicked', () => {
+      it('calls the right actions', () => {
+        createComponent();
+
+        wrapper.find('.js-newest-first').trigger('click');
+
+        expect(store.dispatch).toHaveBeenCalledWith('setDiscussionSortDirection', DESC);
+      });
+    });
+
+    it('shows the "Oldest First" as the dropdown', () => {
+      createComponent();
+
+      expect(wrapper.find('.js-dropdown-text').text()).toBe('Oldest first');
+    });
+  });
+
+  describe('when desc', () => {
+    beforeEach(() => {
+      store.state.discussionSortOrder = DESC;
+      createComponent();
+    });
+
+    describe('when the dropdown item is clicked', () => {
+      it('calls the right actions', () => {
+        wrapper.find('.js-oldest-first').trigger('click');
+
+        expect(store.dispatch).toHaveBeenCalledWith('setDiscussionSortDirection', ASC);
+      });
+
+      it('applies the active class to the correct button in the dropdown', () => {
+        expect(wrapper.find('.js-newest-first').classes()).toContain('is-active');
+      });
+    });
+
+    it('shows the "Newest First" as the dropdown', () => {
+      expect(wrapper.find('.js-dropdown-text').text()).toBe('Newest first');
+    });
+  });
+});