[improvement] rename packages dir to src (#3659)

src/panel/test/__snapshots__/demo.spec.js.snap

@@ -0,0 +1,35 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`renders demo correctly 1`] = `
+<div>
+  <div>
+    <div class="van-cell-group van-hairline--top-bottom van-panel">
+      <div class="van-cell van-panel__header">
+        <div class="van-cell__title"><span>标题</span>
+          <div class="van-cell__label">描述信息</div>
+        </div>
+        <div class="van-cell__value van-panel__header-value"><span>状态</span></div>
+      </div>
+      <div class="van-panel__content">
+        <div>内容</div>
+      </div>
+    </div>
+  </div>
+  <div>
+    <div class="van-cell-group van-hairline--top-bottom van-panel">
+      <div class="van-cell van-panel__header">
+        <div class="van-cell__title"><span>标题</span>
+          <div class="van-cell__label">描述信息</div>
+        </div>
+        <div class="van-cell__value van-panel__header-value"><span>状态</span></div>
+      </div>
+      <div class="van-panel__content">
+        <div>内容</div>
+      </div>
+      <div class="van-panel__footer van-hairline--top"><button class="van-button van-button--default van-button--small"><span class="van-button__text">按钮</span></button> <button class="van-button van-button--danger van-button--small"><span class="van-button__text">
+          按钮
+        </span></button></div>
+    </div>
+  </div>
+</div>
+`;

src/panel/test/demo.spec.js

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+import Demo from '../demo';
+import demoTest from '../../../test/demo-test';
+
+demoTest(Demo);