Updated to PHPUnit 9

.travis.yml

@@ -37,8 +37,8 @@ script:
 
 after_success:
   - rm -f build/clover.xml
-  - wget https://phar.phpunit.de/phpcov-6.0.1.phar
-  - phpdbg -qrr phpcov-6.0.1.phar merge build --clover build/clover.xml
+  - wget https://phar.phpunit.de/phpcov-7.0.1.phar
+  - phpdbg -qrr phpcov-7.0.1.phar merge build --clover build/clover.xml
   - wget https://scrutinizer-ci.com/ocular.phar
   - php ocular.phar code-coverage:upload --format=php-clover build/clover.xml
 

composer.json

@@ -58,14 +58,14 @@
     },
     "require-dev": {
         "devster/ubench": "^2.0",
-        "dms/phpunit-arraysubset-asserts": "^0.1.0",
+        "dms/phpunit-arraysubset-asserts": "^0.2.0",
         "eaglewu/swoole-ide-helper": "dev-master",
         "infection/infection": "^0.15.0",
         "phpstan/phpstan": "^0.12.3",
-        "phpunit/phpunit": "^8.3",
+        "phpunit/phpunit": "^9.0.1",
         "roave/security-advisories": "dev-master",
         "shlinkio/php-coding-standard": "~2.1.0",
-        "shlinkio/shlink-test-utils": "^1.3",
+        "shlinkio/shlink-test-utils": "^1.4",
         "symfony/var-dumper": "^5.0"
     },
     "autoload": {