1 files changed, 53 insertions, 0 deletions
diff --git a/spec/frontend/header_spec.js b/spec/frontend/header_spec.js
new file mode 100644
index 00000000000..00b5b306d66
--- /dev/null
+++ b/spec/frontend/header_spec.js
@@ -0,0 +1,53 @@
+import $ from 'jquery';
+import initTodoToggle from '~/header';
+
+describe('Header', () => {
+  const todosPendingCount = '.todos-count';
+  const fixtureTemplate = 'issues/open-issue.html';
+
+  function isTodosCountHidden() {
+    return $(todosPendingCount).hasClass('hidden');
+  }
+
+  function triggerToggle(newCount) {
+    $(document).trigger('todo:toggle', newCount);
+  }
+
+  preloadFixtures(fixtureTemplate);
+  beforeEach(() => {
+    initTodoToggle();
+    loadFixtures(fixtureTemplate);
+  });
+
+  it('should update todos-count after receiving the todo:toggle event', () => {
+    triggerToggle(5);
+
+    expect($(todosPendingCount).text()).toEqual('5');
+  });
+
+  it('should hide todos-count when it is 0', () => {
+    triggerToggle(0);
+
+    expect(isTodosCountHidden()).toEqual(true);
+  });
+
+  it('should show todos-count when it is more than 0', () => {
+    triggerToggle(10);
+
+    expect(isTodosCountHidden()).toEqual(false);
+  });
+
+  describe('when todos-count is 1000', () => {
+    beforeEach(() => {
+      triggerToggle(1000);
+    });
+
+    it('should show todos-count', () => {
+      expect(isTodosCountHidden()).toEqual(false);
+    });
+
+    it('should show 99+ for todos-count', () => {
+      expect($(todosPendingCount).text()).toEqual('99+');
+    });
+  });
+});