1 files changed, 77 insertions, 0 deletions
diff --git a/spec/frontend/ide/components/ide_tree_list_spec.js b/spec/frontend/ide/components/ide_tree_list_spec.js
new file mode 100644
index 00000000000..30f11db3153
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+++ b/spec/frontend/ide/components/ide_tree_list_spec.js
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+import Vue from 'vue';
+import IdeTreeList from '~/ide/components/ide_tree_list.vue';
+import store from '~/ide/stores';
+import { createComponentWithStore } from '../../helpers/vue_mount_component_helper';
+import { resetStore, file } from '../helpers';
+import { projectData } from '../mock_data';
+
+describe('IDE tree list', () => {
+  const Component = Vue.extend(IdeTreeList);
+  const normalBranchTree = [file('fileName')];
+  const emptyBranchTree = [];
+  let vm;
+
+  const bootstrapWithTree = (tree = normalBranchTree) => {
+    store.state.currentProjectId = 'abcproject';
+    store.state.currentBranchId = 'master';
+    store.state.projects.abcproject = { ...projectData };
+    Vue.set(store.state.trees, 'abcproject/master', {
+      tree,
+      loading: false,
+    });
+
+    vm = createComponentWithStore(Component, store, {
+      viewerType: 'edit',
+    });
+  };
+
+  afterEach(() => {
+    vm.$destroy();
+
+    resetStore(vm.$store);
+  });
+
+  describe('normal branch', () => {
+    beforeEach(() => {
+      bootstrapWithTree();
+
+      jest.spyOn(vm, 'updateViewer');
+
+      vm.$mount();
+    });
+
+    it('updates viewer on mount', () => {
+      expect(vm.updateViewer).toHaveBeenCalledWith('edit');
+    });
+
+    it('renders loading indicator', done => {
+      store.state.trees['abcproject/master'].loading = true;
+
+      vm.$nextTick(() => {
+        expect(vm.$el.querySelector('.multi-file-loading-container')).not.toBeNull();
+        expect(vm.$el.querySelectorAll('.multi-file-loading-container').length).toBe(3);
+
+        done();
+      });
+    });
+
+    it('renders list of files', () => {
+      expect(vm.$el.textContent).toContain('fileName');
+    });
+  });
+
+  describe('empty-branch state', () => {
+    beforeEach(() => {
+      bootstrapWithTree(emptyBranchTree);
+
+      jest.spyOn(vm, 'updateViewer');
+
+      vm.$mount();
+    });
+
+    it('does not load files if the branch is empty', () => {
+      expect(vm.$el.textContent).not.toContain('fileName');
+      expect(vm.$el.textContent).toContain('No files');
+    });
+  });
+});