Add sanity test

test/sum.test.js

@@ -1,5 +1,21 @@
-const sum = require('./sum');
+import Vue from 'vue/dist/vue';
+import { mount } from '@vue/test-utils';
+import { mixin as clickaway } from 'vue-clickaway';
 
-test('adds 1 + 2 to equal 3', () => {
-  expect(sum(1, 2)).toBe(3);
+test('sanity test', () => {
+  var wrapper = new Vue({
+    mixins: [clickaway],
+    template: '<p v-on-clickaway="away">Click away</p>',
+    data: { foo: true },
+    methods: {
+      away() {
+        console.log('clicked away');
+        return 'boom';
+      }
+    }
+  }).$mount();
+  expect(wrapper.away()).toBe('boom');
 });
+
+// NOTES
+// - look up rollup