add example with just unit test code coverage

Author: bahmutov

examples/unit-tests-js/.babelrc

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+{
+  "plugins": ["istanbul"]
+}

examples/unit-tests-js/README.md

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+# example: unit-tests-js
+
+Examples that only run unit tests written using JavaScript

examples/unit-tests-js/cypress.json

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+{
+  "fixturesFolder": false
+}

examples/unit-tests-js/cypress/integration/spec.js

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+/// <reference types="cypress" />
+import { isObject, add } from '../../src/utils/misc'
+
+describe('unit tests', () => {
+  it('adds two numbers', () => {
+    expect(add(2, 3)).to.equal(5)
+  })
+
+  it('checks for object', () => {
+    expect(isObject({}), '{}').to.be.true
+    expect(isObject([]), '[]').to.be.true
+  })
+})

examples/unit-tests-js/cypress/plugins/index.js

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+module.exports = (on, config) => {
+  require('../../../../task')(on, config)
+  on('file:preprocessor', require('../../../../use-babelrc'))
+  return config
+}

examples/unit-tests-js/cypress/support/index.js

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+import '../../../../support'

examples/unit-tests-js/package.json

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+{
+  "name": "example-unit-tests-js",
+  "description": "Run unit tests written using JavaScript",
+  "scripts": {
+    "cy:open": "../../node_modules/.bin/cypress open"
+  }
+}

examples/unit-tests-js/src/utils/misc.js

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+/**
+ * Very simple check, returns true for arrays as well
+ */
+export function isObject(object) {
+  return object != null && typeof object === 'object'
+}
+
+/**
+ * Adds two numbers together
+ * @param {number} a
+ * @param {number} b
+ */
+export const add = (a, b) => a + b