simplify test config (#639)

test/components/waterfall/waterfall.vue

@@ -0,0 +1,47 @@
+<script>
+  import Waterfall from 'packages/waterfall';
+
+  export default {
+    props: {
+      disabled: Boolean,
+      list: Array,
+      onWaterfallLower: {
+        type: Function,
+        default() {
+          return function() {};
+        }
+      },
+      onWaterfallUpper: {
+        type: Function,
+        default() {
+          return function() {};
+        }
+      }
+    },
+    directives: {
+      WaterfallLower: Waterfall('lower'),
+      WaterfallUpper: Waterfall('upper')
+    },
+    methods: {
+      triggerWaterfallLower() {
+        this.onWaterfallLower();
+      },
+      triggerWaterfallUpper() {
+        this.onWaterfallUpper();
+      }
+    }
+  };
+</script>
+
+<template>
+  <div
+    v-waterfall-lower="triggerWaterfallLower"
+    v-waterfall-upper="triggerWaterfallUpper"
+    waterfall-disabled="disabled"
+  >
+    <div
+      v-for="item in list"
+      class="waterfall-item"
+    >{{ item.id }}</div>
+  </div>
+</template>