1 files changed, 83 insertions, 0 deletions
diff --git a/spec/frontend/vue_shared/components/gl_countdown_spec.js b/spec/frontend/vue_shared/components/gl_countdown_spec.js
new file mode 100644
index 00000000000..365c9fad478
--- /dev/null
+++ b/spec/frontend/vue_shared/components/gl_countdown_spec.js
@@ -0,0 +1,83 @@
+import mountComponent from 'helpers/vue_mount_component_helper';
+import Vue from 'vue';
+import GlCountdown from '~/vue_shared/components/gl_countdown.vue';
+
+describe('GlCountdown', () => {
+  const Component = Vue.extend(GlCountdown);
+  let vm;
+  let now = '2000-01-01T00:00:00Z';
+
+  beforeEach(() => {
+    jest.spyOn(Date, 'now').mockImplementation(() => new Date(now).getTime());
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+    jest.clearAllTimers();
+  });
+
+  describe('when there is time remaining', () => {
+    beforeEach(done => {
+      vm = mountComponent(Component, {
+        endDateString: '2000-01-01T01:02:03Z',
+      });
+
+      Vue.nextTick()
+        .then(done)
+        .catch(done.fail);
+    });
+
+    it('displays remaining time', () => {
+      expect(vm.$el.textContent).toContain('01:02:03');
+    });
+
+    it('updates remaining time', done => {
+      now = '2000-01-01T00:00:01Z';
+      jest.advanceTimersByTime(1000);
+
+      Vue.nextTick()
+        .then(() => {
+          expect(vm.$el.textContent).toContain('01:02:02');
+          done();
+        })
+        .catch(done.fail);
+    });
+  });
+
+  describe('when there is no time remaining', () => {
+    beforeEach(done => {
+      vm = mountComponent(Component, {
+        endDateString: '1900-01-01T00:00:00Z',
+      });
+
+      Vue.nextTick()
+        .then(done)
+        .catch(done.fail);
+    });
+
+    it('displays 00:00:00', () => {
+      expect(vm.$el.textContent).toContain('00:00:00');
+    });
+  });
+
+  describe('when an invalid date is passed', () => {
+    beforeEach(() => {
+      Vue.config.warnHandler = jest.fn();
+    });
+
+    afterEach(() => {
+      Vue.config.warnHandler = null;
+    });
+
+    it('throws a validation error', () => {
+      vm = mountComponent(Component, {
+        endDateString: 'this is invalid',
+      });
+
+      expect(Vue.config.warnHandler).toHaveBeenCalledTimes(1);
+      const [errorMessage] = Vue.config.warnHandler.mock.calls[0];
+
+      expect(errorMessage).toMatch(/^Invalid prop: .* "endDateString"/);
+    });
+  });
+});