Mostly set up

tests/e2e/custom-assertions/elementCount.js

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+// A custom Nightwatch assertion.
+// The assertion name is the filename.
+// Example usage:
+//
+//   browser.assert.elementCount(selector, count)
+//
+// For more information on custom assertions see:
+// http://nightwatchjs.org/guide#writing-custom-assertions
+
+exports.assertion = function elementCount (selector, count) {
+  this.message = 'Testing if element "' + selector + '" has count: ' + count;
+  this.expected = count;
+  this.pass = (value) => {
+    return value === count;
+  };
+  this.value = (result) => {
+    return result.value;
+  };
+  function evaluator (_selector) {
+    return document.querySelectorAll(_selector).length;
+  }
+  this.command = (cb) => {
+    return this.api.execute(evaluator, [selector], cb);
+  };
+};

tests/e2e/specs/test.js

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+// For authoring Nightwatch tests, see
+// http://nightwatchjs.org/guide#usage
+
+module.exports = {
+  'default e2e tests': (browser) => {
+    browser
+      .url(process.env.VUE_DEV_SERVER_URL)
+      .waitForElementVisible('#app', 5000)
+      .assert.elementPresent('.hello')
+      .assert.containsText('h1', 'Welcome to your Vue.js Desktop App in NW.js!')
+      .assert.containsText('[data-test="versions]"', 'You are using Vue.js (v2.6.10), NW.js (v0.39.2-sdk), Node.js (v12.4.0), and Chromium (v75.0.3770.100).')
+      .assert.elementCount('img', 2)
+      .end();
+  }
+};

tests/unit/.eslintrc.js

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+module.exports = {
+  env: {
+    jest: true
+  }
+};

tests/unit/example.spec.js

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+import { shallowMount } from '@vue/test-utils';
+import HelloWorld from '@/components/HelloWorld.vue';
+
+describe('HelloWorld.vue', () => {
+  it('renders props.msg when passed', () => {
+    const msg = 'new message';
+    const wrapper = shallowMount(HelloWorld, {
+      propsData: { msg }
+    });
+    expect(wrapper.text()).toMatch(msg);
+  });
+});