[Improvement] Rebuild test system (#1051)

packages/toast/test/__snapshots__/index.spec.js.snap

@@ -0,0 +1,24 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`renders toast correctly 1`] = `
+<div>
+  <div>
+    <button class="van-button van-button--default van-button--normal">
+      <!----><span class="van-button__text">文字提示</span></button>
+  </div>
+  <div>
+    <button class="van-button van-button--default van-button--normal">
+      <!----><span class="van-button__text">加载提示</span></button>
+  </div>
+  <div>
+    <button class="van-button van-button--default van-button--normal">
+      <!----><span class="van-button__text">成功提示</span></button>
+    <button class="van-button van-button--default van-button--normal">
+      <!----><span class="van-button__text">失败提示</span></button>
+  </div>
+  <div>
+    <button class="van-button van-button--default van-button--normal">
+      <!----><span class="van-button__text">高级用法</span></button>
+  </div>
+</div>
+`;

packages/toast/test/index.spec.js

@@ -0,0 +1,3 @@
+import demoTest from '../../../test/demo-test';
+
+demoTest('toast');