simplify test config (#639)

test/components/number-keyboard.vue

@@ -0,0 +1,19 @@
+<template>
+  <keep-alive>
+    <van-number-keyboard v-if="showKeyboard" />
+  </keep-alive>
+</template>
+
+<script>
+import NumberKeyboard from 'packages/number-keyboard';
+
+export default {
+  name: 'number-keyboard-test',
+
+  components: {
+    [NumberKeyboard.name]: NumberKeyboard
+  },
+
+  props: ['showKeyboard']
+};
+</script>