Add test for Option Parsing

__tests__/__snapshots__/upgradeConfig.test.js.snap

@@ -1,5 +1,23 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`convert comma separated presets/plugins into an array 1`] = `
+Object {
+  "env": Object {
+    "development": Object {
+      "plugins": Array [
+        "babel-plugin-istanbul, transform-react-jsx-source, babel-plugin-transform-react-inline-elements",
+      ],
+    },
+  },
+  "plugins": Array [
+    "babel-plugin-transform-function-bind, transform-class-properties",
+  ],
+  "presets": Array [
+    "@babel/preset-env, @babel/preset-react",
+  ],
+}
+`;
+
 exports[`package that is removed 1`] = `
 Object {
   "plugins": Array [

__tests__/upgradeConfig.test.js

@@ -1,6 +1,7 @@
 const path = require('path');
 const upgradeConfig = require('../src/upgradeConfig');
 const babelrcFixture = require('../fixtures/babelrc');
+const optionParsingFixture = require('../fixtures/option-parsing');
 const { readBabelRC } = require('../src');
 const JSON5_PATH = path.resolve(__dirname, '../fixtures/babelrc.json5');
 
@@ -38,3 +39,7 @@ test('packages (json5)', async () => {
   const json5Data = await readBabelRC(JSON5_PATH);
   expect(upgradeConfig(json5Data)).toMatchSnapshot();
 });
+
+test('convert comma separated presets/plugins into an array', () => {
+  expect(upgradeConfig(optionParsingFixture)).toMatchSnapshot();
+});

fixtures/option-parsing.json

@@ -0,0 +1,9 @@
+{
+  "presets": "@babel/preset-env, @babel/preset-react",
+  "plugins": "babel-plugin-transform-function-bind, transform-class-properties",
+  "env": {
+    "development": {
+      "plugins": "babel-plugin-istanbul, transform-react-jsx-source, babel-plugin-transform-react-inline-elements"
+    }
+  }
+}