improve development and CI process

.travis.yml

@@ -7,20 +7,11 @@ php:
   - 7.0
   - 7.1
   - 7.2
-env:
-  global:
-    - PHPCS_DIR=vendor/squizlabs/php_codesniffer
-    - MO4CS_DIR=vendor/squizlabs/php_codesniffer/src/Standards/MO4
 
 before_script:
   - phpenv config-rm xdebug.ini
   - composer install
-  - mkdir -p $MO4CS_DIR
-  - cp ruleset.xml $MO4CS_DIR/
-  - cp -R Sniffs $MO4CS_DIR/
-  - cp -R Tests $MO4CS_DIR/
-  - (cd $PHPCS_DIR/src/Standards ; git clone https://github.com/djoos/Symfony-coding-standard.git Symfony ; mv Symfony/Symfony/* Symfony/)
 
 script:
-  - (cd $PHPCS_DIR ; ../../bin/phpunit --filter MO4)
-  - $PHPCS_DIR/bin/phpcs $MO4CS_DIR --standard=$PHPCS_DIR/phpcs.xml.dist --report=full -np
+  - vendor/bin/phpunit --filter MO4
+  - vendor/bin/phpcs MO4 --report=full -np

phpcs.xml.dist

@@ -0,0 +1,9 @@
+<?xml version="1.0"?>
+<ruleset name="PHP_CodeSniffer">
+    <description>The coding standard for PHP_CodeSniffer itself.</description>
+
+    <exclude-pattern>*/Tests/*\.(inc|css|js)</exclude-pattern>
+    <exclude-pattern>vendor/*</exclude-pattern>
+
+    <rule ref="vendor/squizlabs/php_codesniffer/phpcs.xml.dist" />
+</ruleset>

phpunit.xml.dist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit backupGlobals="true" beStrictAboutTestsThatDoNotTestAnything="false" bootstrap="vendor/squizlabs/php_codesniffer/tests/bootstrap.php">
+    <testsuites>
+        <testsuite name="PHP_CodeSniffer Test Suite">
+            <file>vendor/squizlabs/php_codesniffer/tests/Standards/AllSniffs.php</file>
+        </testsuite>
+    </testsuites>
+</phpunit>