Adding default value of porps size on module Avatar and some test cases.

src/avatar/__test__/Avatar.test.js

@@ -0,0 +1,29 @@
+import React from 'react';
+import { mount } from 'enzyme';
+import Avatar from '../';
+
+describe('<Avatar>', () => {
+  const Component = mount(<Avatar />);
+
+  it('The name of module must be Avatar', () => {
+    expect(Component.name()).toBe('Avatar');
+  })
+
+  it('The type of props "type" should be string', () => {
+    Component.setProps({ icon: 'user' })
+    expect(typeof Component.prop('icon')).toEqual('string');
+  })
+
+  it('The type of props "type" should be "Element"', () => {
+    Component.setProps({ icon: <div>This is a Dom Element</div> })
+    expect(Component.prop('icon').type).toEqual('div')
+  })
+
+  it('The value of props "size" must be one of ["large", "default", "small"]', () => {
+    expect(["large", "default", "small"]).toContain(Component.prop('size'))
+  })
+
+  it('The value of props "shape" must be one of ["square","circle"]', () => {
+    expect(["square", "circle"]).toContain(Component.prop('shape'))
+  })
+})

src/avatar/index.js

@@ -59,4 +59,5 @@ Avatar.propTypes = {
 Avatar.defaultProps = {
   prefixCls: 'w-avatar',
   shape: 'circle',
+  size: 'default'
 }