[improvement] Circle: support number type of size prop (#4160)

src/circle/test/__snapshots__/index.spec.js.snap

@@ -1,5 +1,12 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`size prop 1`] = `
+<div class="van-circle" style="width: 100px; height: 100px;"><svg viewBox="0 0 1060 1060">
+    <path d="M 530 530 m 0, -500 a 500, 500 0 1, 1 0, 1000 a 500, 500 0 1, 1 0, -1000" class="van-circle__hover" style="fill: none; stroke: #fff; stroke-width: 40px;"></path>
+    <path d="M 530 530 m 0, -500 a 500, 500 0 1, 1 0, 1000 a 500, 500 0 1, 1 0, -1000" stroke="#1989fa" class="van-circle__layer" style="stroke: #1989fa; stroke-width: 41px; stroke-dasharray: 0px 3140px;"></path>
+  </svg></div>
+`;
+
 exports[`speed is 0 1`] = `
 <div class="van-circle" style="width: 100px; height: 100px;"><svg viewBox="0 0 1060 1060">
     <path d="M 530 530 m 0, -500 a 500, 500 0 1, 1 0, 1000 a 500, 500 0 1, 1 0, -1000" class="van-circle__hover" style="fill: none; stroke: #fff; stroke-width: 40px;"></path>

src/circle/test/index.spec.js

@@ -37,3 +37,13 @@ test('animate', async () => {
   expect(onInput).toHaveBeenCalled();
   expect(onInput.mock.calls[0][0]).not.toEqual(0);
 });
+
+test('size prop', () => {
+  const wrapper = mount(Circle, {
+    propsData: {
+      size: 100
+    }
+  });
+
+  expect(wrapper).toMatchSnapshot();
+});