WIP: Setup E2E testing using @woocommerce/e2e-environment

.eslintrc.js

@@ -0,0 +1,27 @@
+const { esLintConfig: baseConfig } = require( '@woocommerce/e2e-environment' );
+
+module.exports = {
+	...baseConfig,
+	root: true,
+	parser: 'babel-eslint',
+	extends: [
+		...baseConfig.extends,
+		'wpcalypso/react',
+		'plugin:jsx-a11y/recommended',
+	],
+	plugins: [
+		...baseConfig.plugins,
+		'jsx-a11y',
+	],
+	env: {
+		...baseConfig.env,
+		browser: true,
+		node: true,
+	},
+	globals: {
+		...baseConfig.globals,
+		wp: true,
+		wpApiSettings: true,
+		wcSettings: true,
+	},
+};

.travis.yml

@@ -1,19 +1,38 @@
 language: php
 os: linux
 dist: xenial
-sudo: false
 
 notifications:
   email: false
 
+services:
+  - docker
+
 php:
   - 7.0
 
+matrix:
+  fast_finish: true
+  include:
+  - name: "Coding standard check"
+  - name: "E2E tests"
+    script:
+      - npm install jest --global
+      - npm run docker:up
+      - npm run test:e2e
+    after_script:
+      - npm run docker:down
+
 branches:
   only:
     - master
 
+before_install:
+  - nvm install lts/erbium
+  - nvm install 10
+
 install:
+  - npm install
   - composer install
 
 script:

babel.config.js

@@ -0,0 +1,13 @@
+const { babelConfig: e2eBabelConfig } = require( '@woocommerce/e2e-environment' );
+
+module.exports = function( api ) {
+	api.cache( true );
+
+	return {
+		...e2eBabelConfig,
+		presets: [
+			...e2eBabelConfig.presets,
+			'@wordpress/babel-preset-default',
+		],
+	};
+};

docker-compose.yaml

@@ -0,0 +1,13 @@
+version: '3.3'
+
+services:
+
+  wordpress-www:
+    volumes:
+      # This path is relative to the first config file
+      # which is in node_modules/@woocommerce/e2e/env
+      - "../../../:/var/www/html/wp-content/plugins/woocommerce-gateway-paypal-express-checkout"
+
+  wordpress-cli:
+    volumes:
+      - "../../../:/var/www/html/wp-content/plugins/woocommerce-gateway-paypal-express-checkout"

includes/class-wc-gateway-ppec-cart-handler.php

@@ -551,6 +551,7 @@ public function enqueue_scripts() {
 					'components'  => 'buttons,funding-eligibility',
 					'commit'      => 'checkout' === $page ? 'true' : 'false',
 					'currency'    => get_woocommerce_currency(),
+					'buyer-country' => 'US',
 				);
 
 				$script_args = apply_filters( 'woocommerce_paypal_express_checkout_sdk_script_args', $script_args, $settings, $client );