added basic tests for FolderTree and TreeNode components

Author: shunjizhan

src/components/FolderTree/FolderTree.test.jsx

@@ -0,0 +1,37 @@
+import React from 'react';
+import { mount } from 'enzyme';
+import FolderTree from './FolderTree';
+
+import { testData } from '../../utils/testData';
+
+let tree;
+
+const render = ({
+  data,
+  onChange = console.log,   // eslint-disable-line
+  initCheckedStatus = 'unchecked',
+  initOpenStatus = 'open',
+  iconComponents = {},
+  showCheckbox = true,
+  indentPixels = 30,
+  onNameClick = null,
+  readOnly = false,
+}) => {
+  tree = mount((
+    <FolderTree
+      data={ data }
+      onChange={ onChange }
+      initCheckedStatus={ initCheckedStatus }
+      initOpenStatus={ initOpenStatus }
+      iconComponents={ iconComponents }
+      showCheckbox={ showCheckbox }
+      indentPixels={ indentPixels }
+      onNameClick={ onNameClick }
+      readOnly={ readOnly }
+    />
+  ));
+};
+
+test('render', () => {
+  render({ data: testData });
+});

src/components/TreeNode/TreeNode.test.js

@@ -0,0 +1,65 @@
+import React, { createContext } from 'react';
+import { mount } from 'enzyme';
+import TreeNode from './TreeNode';
+
+import { initializedTestData } from '../../utils/testData';
+import ConfigContext from '../FolderTree/context';
+
+let node;
+
+const checkNode = jest.fn();
+const renameNode = jest.fn();
+const deleteNode = jest.fn();
+const addNode = jest.fn();
+const toggleOpen = jest.fn();
+const onNameClick = jest.fn();
+
+const render = ({
+  iconComponents = {},
+  indentPixels = 4,
+  showCheckbox = true,
+  readOnly = false,
+
+  path,
+  name,
+  checked,
+  isOpen,
+  children,
+  ...restData
+}) => {
+  const configs = {
+    handleCheck: checkNode,
+    handleRename: renameNode,
+    handleDelete: deleteNode,
+    handleAddNode: addNode,
+    handleToggleOpen: toggleOpen,
+    onNameClick,
+
+    iconComponents,
+    indentPixels,
+    showCheckbox,
+    readOnly,
+  };
+
+  node = mount((
+    <ConfigContext.Provider
+      value={ configs }
+    >
+      <TreeNode
+        path={ path }
+        name={ name }
+        checked={ checked }
+        isOpen={ isOpen }
+        children={ children }
+        { ...restData }
+      />
+    </ConfigContext.Provider>
+  ));
+};
+
+test('render', () => {
+  render({
+    path: [],
+    ...initializedTestData,
+  });
+});