1 files changed, 93 insertions, 0 deletions
diff --git a/spec/frontend/ide/components/nav_dropdown_button_spec.js b/spec/frontend/ide/components/nav_dropdown_button_spec.js
new file mode 100644
index 00000000000..2aa3992a6d8
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+++ b/spec/frontend/ide/components/nav_dropdown_button_spec.js
@@ -0,0 +1,93 @@
+import Vue from 'vue';
+import { trimText } from 'helpers/text_helper';
+import { mountComponentWithStore } from 'helpers/vue_mount_component_helper';
+import NavDropdownButton from '~/ide/components/nav_dropdown_button.vue';
+import { createStore } from '~/ide/stores';
+
+describe('NavDropdown', () => {
+  const TEST_BRANCH_ID = 'lorem-ipsum-dolar';
+  const TEST_MR_ID = '12345';
+  let store;
+  let vm;
+
+  beforeEach(() => {
+    store = createStore();
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  const createComponent = (props = {}) => {
+    vm = mountComponentWithStore(Vue.extend(NavDropdownButton), { props, store });
+    vm.$mount();
+  };
+
+  const findIcon = name => vm.$el.querySelector(`.ic-${name}`);
+  const findMRIcon = () => findIcon('merge-request');
+  const findBranchIcon = () => findIcon('branch');
+
+  describe('normal', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it('renders empty placeholders, if state is falsey', () => {
+      expect(trimText(vm.$el.textContent)).toEqual('- -');
+    });
+
+    it('renders branch name, if state has currentBranchId', done => {
+      vm.$store.state.currentBranchId = TEST_BRANCH_ID;
+
+      vm.$nextTick()
+        .then(() => {
+          expect(trimText(vm.$el.textContent)).toEqual(`${TEST_BRANCH_ID} -`);
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+
+    it('renders mr id, if state has currentMergeRequestId', done => {
+      vm.$store.state.currentMergeRequestId = TEST_MR_ID;
+
+      vm.$nextTick()
+        .then(() => {
+          expect(trimText(vm.$el.textContent)).toEqual(`- !${TEST_MR_ID}`);
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+
+    it('renders branch and mr, if state has both', done => {
+      vm.$store.state.currentBranchId = TEST_BRANCH_ID;
+      vm.$store.state.currentMergeRequestId = TEST_MR_ID;
+
+      vm.$nextTick()
+        .then(() => {
+          expect(trimText(vm.$el.textContent)).toEqual(`${TEST_BRANCH_ID} !${TEST_MR_ID}`);
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+
+    it('shows icons', () => {
+      expect(findBranchIcon()).toBeTruthy();
+      expect(findMRIcon()).toBeTruthy();
+    });
+  });
+
+  describe('with showMergeRequests false', () => {
+    beforeEach(() => {
+      createComponent({ showMergeRequests: false });
+    });
+
+    it('shows single empty placeholder, if state is falsey', () => {
+      expect(trimText(vm.$el.textContent)).toEqual('-');
+    });
+
+    it('shows only branch icon', () => {
+      expect(findBranchIcon()).toBeTruthy();
+      expect(findMRIcon()).toBe(null);
+    });
+  });
+});