diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1f07f9abdb18a952248491184314df2aba13bcd2..48a208dcf63b3c6398407ebf0e4e36264e3db416 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -26,6 +26,7 @@ test:php72:
   script:
     - vendor/bin/phpunit --coverage-text
     - vendor/bin/phpcs
+    - vendor/bin/phpcpd app/ config/ database/ public/ resources/ routes/ tests/
 
 test:gitleaks:
   stage: test
diff --git a/composer.json b/composer.json
index d4e86338b53ebe63d2bfeae6249f241db786dab6..b7cc9f0e914a25f5979fe81fcfb0c575c66e7dc8 100644
--- a/composer.json
+++ b/composer.json
@@ -20,6 +20,7 @@
         "fzaninotto/faker": "~1.4",
         "mockery/mockery": "~1.0",
         "phpunit/phpunit": "~7.0",
+        "sebastian/phpcpd": "^4.1",
         "slevomat/coding-standard": "^5.0",
         "squizlabs/php_codesniffer": "^3.4"
     },
diff --git a/composer.lock b/composer.lock
index f64fa9ce8eb4c20760ad5f016e670a6422376e5b..7053de7eeec839fe21df7e140d336cb8310ca64b 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "f5687f9e5df5768cf2c79413ca6a472f",
+    "content-hash": "8caaec7b2bf000584cc1830a20855ad2",
     "packages": [
         {
             "name": "composer/ca-bundle",
@@ -1080,6 +1080,7 @@
                     "homepage": "http://www.acci.cz"
                 }
             ],
+            "abandoned": "php-parallel-lint/php-console-color",
             "time": "2014-04-08T15:00:19+00:00"
         },
         {
@@ -1124,6 +1125,7 @@
                     "homepage": "http://www.acci.cz/"
                 }
             ],
+            "abandoned": "php-parallel-lint/php-console-highlighter",
             "time": "2015-04-20T18:58:01+00:00"
         },
         {
@@ -4855,6 +4857,49 @@
             ],
             "time": "2017-04-03T13:19:02+00:00"
         },
+        {
+            "name": "sebastian/finder-facade",
+            "version": "1.2.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/finder-facade.git",
+                "reference": "167c45d131f7fc3d159f56f191a0a22228765e16"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/finder-facade/zipball/167c45d131f7fc3d159f56f191a0a22228765e16",
+                "reference": "167c45d131f7fc3d159f56f191a0a22228765e16",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1",
+                "symfony/finder": "^2.3|^3.0|^4.0|^5.0",
+                "theseer/fdomdocument": "^1.6"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": []
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "FinderFacade is a convenience wrapper for Symfony's Finder component.",
+            "homepage": "https://github.com/sebastianbergmann/finder-facade",
+            "time": "2020-01-16T08:08:45+00:00"
+        },
         {
             "name": "sebastian/global-state",
             "version": "2.0.0",
@@ -4998,6 +5043,57 @@
             "homepage": "https://github.com/sebastianbergmann/object-reflector/",
             "time": "2017-03-29T09:07:27+00:00"
         },
+        {
+            "name": "sebastian/phpcpd",
+            "version": "4.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/phpcpd.git",
+                "reference": "0d9afa762f2400de077b2192f4a9d127de0bb78e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpcpd/zipball/0d9afa762f2400de077b2192f4a9d127de0bb78e",
+                "reference": "0d9afa762f2400de077b2192f4a9d127de0bb78e",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "php": "^7.1",
+                "phpunit/php-timer": "^2.0",
+                "sebastian/finder-facade": "^1.1",
+                "sebastian/version": "^1.0|^2.0",
+                "symfony/console": "^2.7|^3.0|^4.0"
+            },
+            "bin": [
+                "phpcpd"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Copy/Paste Detector (CPD) for PHP code.",
+            "homepage": "https://github.com/sebastianbergmann/phpcpd",
+            "time": "2018-09-17T17:17:27+00:00"
+        },
         {
             "name": "sebastian/recursion-context",
             "version": "3.0.0",
@@ -5227,6 +5323,46 @@
             ],
             "time": "2019-04-10T23:49:02+00:00"
         },
+        {
+            "name": "theseer/fdomdocument",
+            "version": "1.6.6",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/fDOMDocument.git",
+                "reference": "6e8203e40a32a9c770bcb62fe37e68b948da6dca"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/fDOMDocument/zipball/6e8203e40a32a9c770bcb62fe37e68b948da6dca",
+                "reference": "6e8203e40a32a9c770bcb62fe37e68b948da6dca",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "lib-libxml": "*",
+                "php": ">=5.3.3"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "The classes contained within this repository extend the standard DOM to use exceptions at all occasions of errors instead of PHP warnings or notices. They also add various custom methods and shortcuts for convenience and to simplify the usage of DOM.",
+            "homepage": "https://github.com/theseer/fDOMDocument",
+            "time": "2017-06-30T11:53:12+00:00"
+        },
         {
             "name": "theseer/tokenizer",
             "version": "1.1.0",