Add PHPStorm files. Add CodeClimate.

.travis.yml

@@ -9,17 +9,23 @@ sudo: false
 matrix:
   fast_finish: true
   include:
-    - php: '7.1'
-    - php: '7.2'
-    - php: '7.3'
+    - php: 7.1
+    - php: 7.2
+    - php: 7.3
+
+before_script:
+  - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
+  - chmod +x ./cc-test-reporter
+  - ./cc-test-reporter before-build
 
 install:
   - travis_retry composer install --no-progress --no-interaction --prefer-dist
 
 script:
   - ./vendor/bin/php-cs-fixer fix --allow-risky=yes --dry-run -v --stop-on-violation
   - ./vendor/bin/phpstan analyse -l 7 -c phpstan.neon src tests
-  - ./vendor/bin/phpunit --coverage-clover=coverage.xml
+  - ./vendor/bin/phpunit --coverage-clover=clover.xml
 
 after_success:
-  - bash <(curl -s https://codecov.io/bash)
+  - bash <(curl -s https://codecov.io/bash)
+  - ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT

README.md

@@ -28,18 +28,19 @@ To include `mc-google-visualization` in your project, add it to your `composer.j
 
 include_once 'vendor/autoload.php';
 
-$feed = new AtomGenerator\Feed();
-$feed->setTitle('Blog');
-$feed->setUpdatedDateTime(new DateTime('now'));
-
 $entry = new AtomGenerator\Entry();
 $entry->setTitle('Post', 'text');
 $entry->setId('tag:id');
 $entry->setContent('Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.', 'text');
 $entry->setUpdatedDateTime(new DateTime('2019-05-04T21:00:40Z'));
 
+$feed = new AtomGenerator\Feed();
+$feed->setTitle('Blog');
+$feed->setUpdatedDateTime(new DateTime('now'));
 $feed->addEntry($entry);
 
+assert(AtomGenerator\Feed::validate($feed->getDocument()));
+
 echo $feed->saveXML();
 ```
 

composer.json

@@ -18,6 +18,7 @@
   "require": {
     "php": "^7.1",
     "ext-dom": "*",
+    "ext-libxml": "*",
     "ext-simplexml": "*",
     "webmozart/assert": "^1.5"
   },