Index: /branches/5.3/.github/workflows/phpunit-tests.yml
===================================================================
--- /branches/5.3/.github/workflows/phpunit-tests.yml	(revision 51844)
+++ /branches/5.3/.github/workflows/phpunit-tests.yml	(revision 51845)
@@ -24,5 +24,4 @@
 env:
   PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: ${{ true }}
-  COMPOSER_INSTALL: ${{ false }}
   # Controls which NPM script to use for running PHPUnit tests. Options ar `php` and `php-composer`.
   PHPUNIT_SCRIPT: php
@@ -140,9 +139,7 @@
       - name: Get composer cache directory
         id: composer-cache
-        if: ${{ env.COMPOSER_INSTALL == true }}
         run: echo "::set-output name=dir::$(composer config cache-files-dir)"
 
       - name: Cache Composer dependencies
-        if: ${{ env.COMPOSER_INSTALL == true }}
         uses: actions/cache@26968a09c0ea4f3e233fdddbafd1166051a095f6 # v2.1.4
         env:
@@ -153,8 +150,14 @@
 
       - name: Install Composer dependencies
-        if: ${{ env.COMPOSER_INSTALL == true }}
-        run: |
-          docker-compose run --rm php composer --version
-          docker-compose run --rm php composer install
+        run: |
+          if [ ${{ env.LOCAL_PHP }} == '7.1-fpm' ]; then
+            docker-compose run --rm php composer update
+            git checkout -- composer.lock
+          elif [[ ${{ env.LOCAL_PHP }} == '5.6.20-fpm' || ${{ env.LOCAL_PHP }} == '5.6-fpm' || ${{ env.LOCAL_PHP }} == '7.0-fpm' ]]; then
+            docker-compose run --rm php composer require --dev phpunit/phpunit:"^5.7" --update-with-dependencies
+            git checkout -- composer.lock composer.json
+          else
+            docker-compose run --rm php composer install
+          fi
 
       - name: Docker debug information
Index: /branches/5.3/composer.json
===================================================================
--- /branches/5.3/composer.json	(revision 51844)
+++ /branches/5.3/composer.json	(revision 51845)
@@ -16,5 +16,7 @@
 		"dealerdirect/phpcodesniffer-composer-installer": "^0.6.2 || ^0.7.0",
 		"wp-coding-standards/wpcs": "~2.1.0",
-		"phpcompatibility/phpcompatibility-wp": "^2.1.0"
+		"phpcompatibility/phpcompatibility-wp": "^2.1.0",
+		"phpunit/phpunit": "^5.7.21 || ^6.5 || ^7.5",
+		"yoast/phpunit-polyfills": "^1.0.1"
 	},
 	"scripts": {
Index: /branches/5.3/composer.lock
===================================================================
--- /branches/5.3/composer.lock	(revision 51844)
+++ /branches/5.3/composer.lock	(revision 51845)
@@ -5,5 +5,5 @@
         "This file is @generated automatically"
     ],
-    "content-hash": "463db2b4afb439fb63d93173c0852e27",
+    "content-hash": "44dd0c9ea4d875c96bad2b020a7163e5",
     "packages": [],
     "packages-dev": [
@@ -79,4 +79,241 @@
         },
         {
+            "name": "doctrine/instantiator",
+            "version": "1.4.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/instantiator.git",
+                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/d56bf6102915de5702778fe20f2de3b2fe570b5b",
+                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "require-dev": {
+                "doctrine/coding-standard": "^8.0",
+                "ext-pdo": "*",
+                "ext-phar": "*",
+                "phpbench/phpbench": "^0.13 || 1.0.0-alpha2",
+                "phpstan/phpstan": "^0.12",
+                "phpstan/phpstan-phpunit": "^0.12",
+                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Marco Pivetta",
+                    "email": "ocramius@gmail.com",
+                    "homepage": "https://ocramius.github.io/"
+                }
+            ],
+            "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
+            "homepage": "https://www.doctrine-project.org/projects/instantiator.html",
+            "keywords": [
+                "constructor",
+                "instantiate"
+            ],
+            "support": {
+                "issues": "https://github.com/doctrine/instantiator/issues",
+                "source": "https://github.com/doctrine/instantiator/tree/1.4.0"
+            },
+            "funding": [
+                {
+                    "url": "https://www.doctrine-project.org/sponsorship.html",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.patreon.com/phpdoctrine",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Finstantiator",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-11-10T18:47:58+00:00"
+        },
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.10.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/776f831124e9c62e1a2c601ecc52e776d8bb7220",
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "replace": {
+                "myclabs/deep-copy": "self.version"
+            },
+            "require-dev": {
+                "doctrine/collections": "^1.0",
+                "doctrine/common": "^2.6",
+                "phpunit/phpunit": "^7.1"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                },
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.10.2"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-11-13T09:40:50+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "1.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
+                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-phar": "*",
+                "phar-io/version": "^2.0",
+                "php": "^5.6 || ^7.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "support": {
+                "issues": "https://github.com/phar-io/manifest/issues",
+                "source": "https://github.com/phar-io/manifest/tree/master"
+            },
+            "time": "2018-07-08T19:23:20+00:00"
+        },
+        {
+            "name": "phar-io/version",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/45a2ec53a73c70ce41d55cedef9063630abaf1b6",
+                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.6 || ^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/master"
+            },
+            "time": "2018-07-08T19:19:57+00:00"
+        },
+        {
             "name": "phpcompatibility/php-compatibility",
             "version": "9.3.1",
@@ -239,4 +476,1274 @@
         },
         {
+            "name": "phpdocumentor/reflection-common",
+            "version": "2.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
+                "reference": "6568f4687e5b41b054365f9ae03fcb1ed5f2069b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/6568f4687e5b41b054365f9ae03fcb1ed5f2069b",
+                "reference": "6568f4687e5b41b054365f9ae03fcb1ed5f2069b",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "phpDocumentor\\Reflection\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Jaap van Otterdijk",
+                    "email": "opensource@ijaap.nl"
+                }
+            ],
+            "description": "Common reflection classes used by phpdocumentor to reflect the code structure",
+            "homepage": "http://www.phpdoc.org",
+            "keywords": [
+                "FQSEN",
+                "phpDocumentor",
+                "phpdoc",
+                "reflection",
+                "static analysis"
+            ],
+            "support": {
+                "issues": "https://github.com/phpDocumentor/ReflectionCommon/issues",
+                "source": "https://github.com/phpDocumentor/ReflectionCommon/tree/master"
+            },
+            "time": "2020-04-27T09:25:28+00:00"
+        },
+        {
+            "name": "phpdocumentor/reflection-docblock",
+            "version": "4.3.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
+                "reference": "da3fd972d6bafd628114f7e7e036f45944b62e9c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/da3fd972d6bafd628114f7e7e036f45944b62e9c",
+                "reference": "da3fd972d6bafd628114f7e7e036f45944b62e9c",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0",
+                "phpdocumentor/reflection-common": "^1.0.0 || ^2.0.0",
+                "phpdocumentor/type-resolver": "~0.4 || ^1.0.0",
+                "webmozart/assert": "^1.0"
+            },
+            "require-dev": {
+                "doctrine/instantiator": "^1.0.5",
+                "mockery/mockery": "^1.0",
+                "phpdocumentor/type-resolver": "0.4.*",
+                "phpunit/phpunit": "^6.4"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "phpDocumentor\\Reflection\\": [
+                        "src/"
+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Mike van Riel",
+                    "email": "me@mikevanriel.com"
+                }
+            ],
+            "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
+            "support": {
+                "issues": "https://github.com/phpDocumentor/ReflectionDocBlock/issues",
+                "source": "https://github.com/phpDocumentor/ReflectionDocBlock/tree/release/4.x"
+            },
+            "time": "2019-12-28T18:55:12+00:00"
+        },
+        {
+            "name": "phpdocumentor/type-resolver",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/TypeResolver.git",
+                "reference": "2e32a6d48972b2c1976ed5d8967145b6cec4a4a9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/2e32a6d48972b2c1976ed5d8967145b6cec4a4a9",
+                "reference": "2e32a6d48972b2c1976ed5d8967145b6cec4a4a9",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1",
+                "phpdocumentor/reflection-common": "^2.0"
+            },
+            "require-dev": {
+                "ext-tokenizer": "^7.1",
+                "mockery/mockery": "~1",
+                "phpunit/phpunit": "^7.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "phpDocumentor\\Reflection\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Mike van Riel",
+                    "email": "me@mikevanriel.com"
+                }
+            ],
+            "description": "A PSR-5 based resolver of Class names, Types and Structural Element Names",
+            "support": {
+                "issues": "https://github.com/phpDocumentor/TypeResolver/issues",
+                "source": "https://github.com/phpDocumentor/TypeResolver/tree/0.7.2"
+            },
+            "time": "2019-08-22T18:11:29+00:00"
+        },
+        {
+            "name": "phpspec/prophecy",
+            "version": "v1.10.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpspec/prophecy.git",
+                "reference": "451c3cd1418cf640de218914901e51b064abb093"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/451c3cd1418cf640de218914901e51b064abb093",
+                "reference": "451c3cd1418cf640de218914901e51b064abb093",
+                "shasum": ""
+            },
+            "require": {
+                "doctrine/instantiator": "^1.0.2",
+                "php": "^5.3|^7.0",
+                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0|^5.0",
+                "sebastian/comparator": "^1.2.3|^2.0|^3.0|^4.0",
+                "sebastian/recursion-context": "^1.0|^2.0|^3.0|^4.0"
+            },
+            "require-dev": {
+                "phpspec/phpspec": "^2.5 || ^3.2",
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5 || ^7.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.10.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Prophecy\\": "src/Prophecy"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Konstantin Kudryashov",
+                    "email": "ever.zet@gmail.com",
+                    "homepage": "http://everzet.com"
+                },
+                {
+                    "name": "Marcello Duarte",
+                    "email": "marcello.duarte@gmail.com"
+                }
+            ],
+            "description": "Highly opinionated mocking framework for PHP 5.3+",
+            "homepage": "https://github.com/phpspec/prophecy",
+            "keywords": [
+                "Double",
+                "Dummy",
+                "fake",
+                "mock",
+                "spy",
+                "stub"
+            ],
+            "support": {
+                "issues": "https://github.com/phpspec/prophecy/issues",
+                "source": "https://github.com/phpspec/prophecy/tree/v1.10.3"
+            },
+            "time": "2020-03-05T15:02:03+00:00"
+        },
+        {
+            "name": "phpunit/php-code-coverage",
+            "version": "6.1.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
+                "reference": "807e6013b00af69b6c5d9ceb4282d0393dbb9d8d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/807e6013b00af69b6c5d9ceb4282d0393dbb9d8d",
+                "reference": "807e6013b00af69b6c5d9ceb4282d0393dbb9d8d",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.1",
+                "phpunit/php-file-iterator": "^2.0",
+                "phpunit/php-text-template": "^1.2.1",
+                "phpunit/php-token-stream": "^3.0",
+                "sebastian/code-unit-reverse-lookup": "^1.0.1",
+                "sebastian/environment": "^3.1 || ^4.0",
+                "sebastian/version": "^2.0.1",
+                "theseer/tokenizer": "^1.1"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^7.0"
+            },
+            "suggest": {
+                "ext-xdebug": "^2.6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "6.1-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": "Library that provides collection, processing, and rendering functionality for PHP code coverage information.",
+            "homepage": "https://github.com/sebastianbergmann/php-code-coverage",
+            "keywords": [
+                "coverage",
+                "testing",
+                "xunit"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-code-coverage/issues",
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/master"
+            },
+            "time": "2018-10-31T16:06:48+00:00"
+        },
+        {
+            "name": "phpunit/php-file-iterator",
+            "version": "2.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
+                "reference": "28af674ff175d0768a5a978e6de83f697d4a7f05"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/28af674ff175d0768a5a978e6de83f697d4a7f05",
+                "reference": "28af674ff175d0768a5a978e6de83f697d4a7f05",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
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+            "homepage": "http://www.github.com/sebastianbergmann/global-state",
+            "keywords": [
+                "global state"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/global-state/issues",
+                "source": "https://github.com/sebastianbergmann/global-state/tree/2.0.0"
+            },
+            "time": "2017-04-27T15:39:26+00:00"
+        },
+        {
+            "name": "sebastian/object-enumerator",
+            "version": "3.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
+                "reference": "e67f6d32ebd0c749cf9d1dbd9f226c727043cdf2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/e67f6d32ebd0c749cf9d1dbd9f226c727043cdf2",
+                "reference": "e67f6d32ebd0c749cf9d1dbd9f226c727043cdf2",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0",
+                "sebastian/object-reflector": "^1.1.1",
+                "sebastian/recursion-context": "^3.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/3.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:40:27+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "1.1.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "9b8772b9cbd456ab45d4a598d2dd1a1bced6363d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/9b8772b9cbd456ab45d4a598d2dd1a1bced6363d",
+                "reference": "9b8772b9cbd456ab45d4a598d2dd1a1bced6363d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/1.1.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:37:18+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "3.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "367dcba38d6e1977be014dc4b22f47a484dac7fb"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/367dcba38d6e1977be014dc4b22f47a484dac7fb",
+                "reference": "367dcba38d6e1977be014dc4b22f47a484dac7fb",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/3.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:34:24+00:00"
+        },
+        {
+            "name": "sebastian/resource-operations",
+            "version": "2.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/resource-operations.git",
+                "reference": "31d35ca87926450c44eae7e2611d45a7a65ea8b3"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/31d35ca87926450c44eae7e2611d45a7a65ea8b3",
+                "reference": "31d35ca87926450c44eae7e2611d45a7a65ea8b3",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Provides a list of PHP built-in functions that operate on resources",
+            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/resource-operations/issues",
+                "source": "https://github.com/sebastianbergmann/resource-operations/tree/2.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:30:19+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-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": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "source": "https://github.com/sebastianbergmann/version/tree/master"
+            },
+            "time": "2016-10-03T07:35:21+00:00"
+        },
+        {
             "name": "squizlabs/php_codesniffer",
             "version": "3.4.0",
@@ -290,4 +1797,180 @@
         },
         {
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.23.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "46cd95797e9df938fdd2b03693b5fca5e64b01ce"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/46cd95797e9df938fdd2b03693b5fca5e64b01ce",
+                "reference": "46cd95797e9df938fdd2b03693b5fca5e64b01ce",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "suggest": {
+                "ext-ctype": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.23-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Ctype\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Gert de Pagter",
+                    "email": "BackEndTea@gmail.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-ctype/tree/v1.23.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-02-19T12:13:01+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.1.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "11336f6f84e16a720dae9d8e6ed5019efa85a0f9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/11336f6f84e16a720dae9d8e6ed5019efa85a0f9",
+                "reference": "11336f6f84e16a720dae9d8e6ed5019efa85a0f9",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/master"
+            },
+            "time": "2019-06-13T22:48:21+00:00"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.9.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozarts/assert.git",
+                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0 || ^8.0",
+                "symfony/polyfill-ctype": "^1.8"
+            },
+            "conflict": {
+                "phpstan/phpstan": "<0.12.20",
+                "vimeo/psalm": "<3.9.1"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.36 || ^7.5.13"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Assert\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Assertions to validate method input/output with nice error messages.",
+            "keywords": [
+                "assert",
+                "check",
+                "validate"
+            ],
+            "support": {
+                "issues": "https://github.com/webmozarts/assert/issues",
+                "source": "https://github.com/webmozarts/assert/tree/1.9.1"
+            },
+            "time": "2020-07-08T17:02:28+00:00"
+        },
+        {
             "name": "wp-coding-standards/wpcs",
             "version": "2.1.1",
@@ -333,4 +2016,67 @@
             ],
             "time": "2019-05-21T02:50:00+00:00"
+        },
+        {
+            "name": "yoast/phpunit-polyfills",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/Yoast/PHPUnit-Polyfills.git",
+                "reference": "f014fb21c2b0038fd329515d59025af42fb98715"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/Yoast/PHPUnit-Polyfills/zipball/f014fb21c2b0038fd329515d59025af42fb98715",
+                "reference": "f014fb21c2b0038fd329515d59025af42fb98715",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4",
+                "phpunit/phpunit": "^4.8.36 || ^5.7.21 || ^6.0 || ^7.0 || ^8.0 || ^9.0"
+            },
+            "require-dev": {
+                "php-parallel-lint/php-console-highlighter": "^0.5",
+                "php-parallel-lint/php-parallel-lint": "^1.3.0",
+                "yoast/yoastcs": "^2.1.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.x-dev",
+                    "dev-develop": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "phpunitpolyfills-autoload.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Team Yoast",
+                    "email": "support@yoast.com",
+                    "homepage": "https://yoast.com"
+                },
+                {
+                    "name": "Contributors",
+                    "homepage": "https://github.com/Yoast/PHPUnit-Polyfills/graphs/contributors"
+                }
+            ],
+            "description": "Set of polyfills for changed PHPUnit functionality to allow for creating PHPUnit cross-version compatible tests",
+            "homepage": "https://github.com/Yoast/PHPUnit-Polyfills",
+            "keywords": [
+                "phpunit",
+                "polyfill",
+                "testing"
+            ],
+            "support": {
+                "issues": "https://github.com/Yoast/PHPUnit-Polyfills/issues",
+                "source": "https://github.com/Yoast/PHPUnit-Polyfills"
+            },
+            "time": "2021-08-09T16:28:08+00:00"
         }
     ],
@@ -343,4 +2089,5 @@
         "php": ">=5.6"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.1.0"
 }
Index: /branches/5.3/tests/phpunit/includes/bootstrap.php
===================================================================
--- /branches/5.3/tests/phpunit/includes/bootstrap.php	(revision 51844)
+++ /branches/5.3/tests/phpunit/includes/bootstrap.php	(revision 51845)
@@ -51,4 +51,111 @@
 	exit( 1 );
 }
+
+/*
+ * Load the PHPUnit Polyfills autoloader.
+ *
+ * The PHPUnit Polyfills are a requirement for the WP test suite.
+ *
+ * For running the Core tests, the Make WordPress Core handbook contains step-by-step instructions
+ * on how to get up and running for a variety of supported workflows:
+ * {@link https://make.wordpress.org/core/handbook/testing/automated-testing/phpunit/#test-running-workflow-options}
+ *
+ * Plugin/theme integration tests can handle this in any of the following ways:
+ * - When using a full WP install: run `composer install` for the WP install prior to running the tests.
+ * - When using a partial WP test suite install:
+ *   - Add a `yoast/phpunit-polyfills` (dev) requirement to the plugin/theme's own `composer.json` file.
+ *   - And then:
+ *     - Either load the PHPUnit Polyfills autoload file prior to running the WP core bootstrap file.
+ *     - Or declare a `WP_TESTS_PHPUNIT_POLYFILLS_PATH` constant containing the absolute path to the
+ *       root directory of the PHPUnit Polyfills installation.
+ *       If the constant is used, it is strongly recommended to declare this constant in the plugin/theme's
+ *       own test bootstrap file.
+ *       The constant MUST be declared prior to calling this file.
+ */
+if ( ! class_exists( 'Yoast\PHPUnitPolyfills\Autoload' ) ) {
+	// Default location of the autoloader for WP core test runs.
+	$phpunit_polyfills_autoloader = dirname( dirname( dirname( __DIR__ ) ) ) . '/vendor/yoast/phpunit-polyfills/phpunitpolyfills-autoload.php';
+	$phpunit_polyfills_error      = false;
+
+	// Allow for a custom installation location to be provided for plugin/theme integration tests.
+	if ( defined( 'WP_TESTS_PHPUNIT_POLYFILLS_PATH' ) ) {
+		$phpunit_polyfills_path = WP_TESTS_PHPUNIT_POLYFILLS_PATH;
+
+		if ( is_string( WP_TESTS_PHPUNIT_POLYFILLS_PATH )
+			&& '' !== WP_TESTS_PHPUNIT_POLYFILLS_PATH
+		) {
+			// Be tolerant to the path being provided including the filename.
+			if ( substr( $phpunit_polyfills_path, -29 ) !== 'phpunitpolyfills-autoload.php' ) {
+				$phpunit_polyfills_path = rtrim( $phpunit_polyfills_path, '/\\' );
+				$phpunit_polyfills_path = $phpunit_polyfills_path . '/phpunitpolyfills-autoload.php';
+			}
+
+			$phpunit_polyfills_autoloader = $phpunit_polyfills_path;
+		} else {
+			$phpunit_polyfills_error = true;
+		}
+	}
+
+	if ( $phpunit_polyfills_error || ! file_exists( $phpunit_polyfills_autoloader ) ) {
+		echo 'Error: The PHPUnit Polyfills library is a requirement for running the WP test suite.' . PHP_EOL;
+		if ( defined( 'WP_TESTS_PHPUNIT_POLYFILLS_PATH' ) ) {
+			printf(
+				'The PHPUnit Polyfills autoload file was not found in "%s"' . PHP_EOL,
+				WP_TESTS_PHPUNIT_POLYFILLS_PATH
+			);
+			echo 'Please verify that the file path provided in the WP_TESTS_PHPUNIT_POLYFILLS_PATH constant is correct.' . PHP_EOL;
+			echo 'The WP_TESTS_PHPUNIT_POLYFILLS_PATH constant should contain an absolute path to the root directory'
+				. ' of the PHPUnit Polyfills library.' . PHP_EOL;
+		} elseif ( defined( 'WP_RUN_CORE_TESTS' ) && WP_RUN_CORE_TESTS ) {
+			echo 'You need to run `composer install` before running the tests.' . PHP_EOL;
+			echo 'Once the dependencies are installed, you can run the tests using the Composer-installed version'
+				. ' of PHPUnit or using a PHPUnit phar file, but the dependencies do need to be installed'
+				. ' whichever way the tests are run.' . PHP_EOL;
+		} else {
+			echo 'If you are trying to run plugin/theme integration tests, make sure the PHPUnit Polyfills library'
+				. ' (https://github.com/Yoast/PHPUnit-Polyfills) is available and either load the autoload file'
+				. ' of this library in your own test bootstrap before calling the WP Core test bootstrap file;'
+				. ' or set the absolute path to the PHPUnit Polyfills library in a "WP_TESTS_PHPUNIT_POLYFILLS_PATH"'
+				. ' constant to allow the WP Core bootstrap to load the Polyfills.' . PHP_EOL . PHP_EOL;
+			echo 'If you are trying to run the WP Core tests, make sure to set the "WP_RUN_CORE_TESTS" constant'
+				. ' to 1 and run `composer install` before running the tests.' . PHP_EOL;
+			echo 'Once the dependencies are installed, you can run the tests using the Composer-installed'
+				. ' version of PHPUnit or using a PHPUnit phar file, but the dependencies do need to be'
+				. ' installed whichever way the tests are run.' . PHP_EOL;
+		}
+		exit( 1 );
+	}
+
+	require_once $phpunit_polyfills_autoloader;
+}
+unset( $phpunit_polyfills_autoloader, $phpunit_polyfills_error, $phpunit_polyfills_path );
+
+/*
+ * Minimum version of the PHPUnit Polyfills package as declared in `composer.json`.
+ * Only needs updating when new polyfill features start being used in the test suite.
+ */
+$phpunit_polyfills_minimum_version = '1.0.1';
+if ( class_exists( '\Yoast\PHPUnitPolyfills\Autoload' )
+	&& ( defined( '\Yoast\PHPUnitPolyfills\Autoload::VERSION' ) === false
+		|| version_compare( Yoast\PHPUnitPolyfills\Autoload::VERSION, $phpunit_polyfills_minimum_version, '<' ) )
+) {
+	printf(
+		'Error: Version mismatch detected for the PHPUnit Polyfills.'
+		. ' Please ensure that PHPUnit Polyfills %s or higher is loaded. Found version: %s' . PHP_EOL,
+		$phpunit_polyfills_minimum_version,
+		defined( '\Yoast\PHPUnitPolyfills\Autoload::VERSION' ) ? Yoast\PHPUnitPolyfills\Autoload::VERSION : '1.0.0 or lower'
+	);
+	if ( defined( 'WP_TESTS_PHPUNIT_POLYFILLS_PATH' ) ) {
+		printf(
+			'Please ensure that the PHPUnit Polyfill installation in "%s" is updated to version %s or higher.' . PHP_EOL,
+			WP_TESTS_PHPUNIT_POLYFILLS_PATH,
+			$phpunit_polyfills_minimum_version
+		);
+	} elseif ( defined( 'WP_RUN_CORE_TESTS' ) && WP_RUN_CORE_TESTS ) {
+		echo 'Please run `composer install` to install the latest version.' . PHP_EOL;
+	}
+	exit( 1 );
+}
+unset( $phpunit_polyfills_minimum_version );
 
 tests_reset__SERVER();
Index: /branches/5.3/tests/phpunit/includes/phpunit7/testcase.php
===================================================================
--- /branches/5.3/tests/phpunit/includes/phpunit7/testcase.php	(revision 51844)
+++ /branches/5.3/tests/phpunit/includes/phpunit7/testcase.php	(revision 51845)
@@ -1,5 +1,21 @@
 <?php
 
-require_once dirname( dirname( __FILE__ ) ) . '/abstract-testcase.php';
+use Yoast\PHPUnitPolyfills\Helpers\AssertAttributeHelper;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertClosedResource;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertEqualsSpecializations;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertFileDirectory;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertFileEqualsSpecializations;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertionRenames;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertIsType;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertNumericType;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertObjectEquals;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertStringContains;
+use Yoast\PHPUnitPolyfills\Polyfills\EqualToSpecializations;
+use Yoast\PHPUnitPolyfills\Polyfills\ExpectException;
+use Yoast\PHPUnitPolyfills\Polyfills\ExpectExceptionMessageMatches;
+use Yoast\PHPUnitPolyfills\Polyfills\ExpectExceptionObject;
+use Yoast\PHPUnitPolyfills\Polyfills\ExpectPHPException;
+
+require_once dirname( __DIR__ ) . '/abstract-testcase.php';
 
 /**
@@ -14,19 +30,46 @@
 class WP_UnitTestCase extends WP_UnitTestCase_Base {
 
+	use AssertAttributeHelper;
+	use AssertClosedResource;
+	use AssertEqualsSpecializations;
+	use AssertFileDirectory;
+	use AssertFileEqualsSpecializations;
+	use AssertionRenames;
+	use AssertIsType;
+	use AssertNumericType;
+	use AssertObjectEquals;
+	use AssertStringContains;
+	use EqualToSpecializations;
+	use ExpectException;
+	use ExpectExceptionMessageMatches;
+	use ExpectExceptionObject;
+	use ExpectPHPException;
+
 	/**
-	 * Asserts that a condition is not false.
-	 *
-	 * This method has been backported from a more recent PHPUnit version, as tests running on PHP 5.2 use
-	 * PHPUnit 3.6.x.
-	 *
-	 * @since 4.7.4
-	 *
-	 * @param bool   $condition Condition to check.
-	 * @param string $message   Optional. Message to display when the assertion fails.
-	 *
-	 * @throws PHPUnit_Framework_AssertionFailedError
+	 * Wrapper method for the `setUpBeforeClass()` method for forward-compatibility with WP 5.9.
 	 */
-	public static function assertNotFalse( $condition, string $message = '' ): void {
-		self::assertThat( $condition, self::logicalNot( self::isFalse() ), $message );
+	public static function set_up_before_class() {
+		static::setUpBeforeClass();
+	}
+
+	/**
+	 * Wrapper method for the `tearDownAfterClass()` method for forward-compatibility with WP 5.9.
+	 */
+	public static function tear_down_after_class() {
+		static::tearDownAfterClass();
+	}
+
+	/**
+	 * Wrapper method for the `setUp()` method for forward-compatibility with WP 5.9.
+	 */
+	public function set_up() {
+		static::setUp();
+	}
+
+	/**
+	 * Wrapper method for the `tearDown()` method for forward-compatibility with WP 5.9.
+	 */
+	public function tear_down() {
+		static::tearDown();
 	}
 }
Index: /branches/5.3/tests/phpunit/includes/testcase.php
===================================================================
--- /branches/5.3/tests/phpunit/includes/testcase.php	(revision 51844)
+++ /branches/5.3/tests/phpunit/includes/testcase.php	(revision 51845)
@@ -1,5 +1,21 @@
 <?php
 
-require_once dirname( __FILE__ ) . '/abstract-testcase.php';
+use Yoast\PHPUnitPolyfills\Helpers\AssertAttributeHelper;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertClosedResource;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertEqualsSpecializations;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertFileDirectory;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertFileEqualsSpecializations;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertionRenames;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertIsType;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertNumericType;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertObjectEquals;
+use Yoast\PHPUnitPolyfills\Polyfills\AssertStringContains;
+use Yoast\PHPUnitPolyfills\Polyfills\EqualToSpecializations;
+use Yoast\PHPUnitPolyfills\Polyfills\ExpectException;
+use Yoast\PHPUnitPolyfills\Polyfills\ExpectExceptionMessageMatches;
+use Yoast\PHPUnitPolyfills\Polyfills\ExpectExceptionObject;
+use Yoast\PHPUnitPolyfills\Polyfills\ExpectPHPException;
+
+require_once __DIR__ . '/abstract-testcase.php';
 
 /**
@@ -14,19 +30,46 @@
 class WP_UnitTestCase extends WP_UnitTestCase_Base {
 
+	use AssertAttributeHelper;
+	use AssertClosedResource;
+	use AssertEqualsSpecializations;
+	use AssertFileDirectory;
+	use AssertFileEqualsSpecializations;
+	use AssertionRenames;
+	use AssertIsType;
+	use AssertNumericType;
+	use AssertObjectEquals;
+	use AssertStringContains;
+	use EqualToSpecializations;
+	use ExpectException;
+	use ExpectExceptionMessageMatches;
+	use ExpectExceptionObject;
+	use ExpectPHPException;
+
 	/**
-	 * Asserts that a condition is not false.
-	 *
-	 * This method has been backported from a more recent PHPUnit version, as tests running on PHP 5.2 use
-	 * PHPUnit 3.6.x.
-	 *
-	 * @since 4.7.4
-	 *
-	 * @param bool   $condition Condition to check.
-	 * @param string $message   Optional. Message to display when the assertion fails.
-	 *
-	 * @throws PHPUnit_Framework_AssertionFailedError
+	 * Wrapper method for the `setUpBeforeClass()` method for forward-compatibility with WP 5.9.
 	 */
-	public static function assertNotFalse( $condition, $message = '' ) {
-		self::assertThat( $condition, self::logicalNot( self::isFalse() ), $message );
+	public static function set_up_before_class() {
+		static::setUpBeforeClass();
+	}
+
+	/**
+	 * Wrapper method for the `tearDownAfterClass()` method for forward-compatibility with WP 5.9.
+	 */
+	public static function tear_down_after_class() {
+		static::tearDownAfterClass();
+	}
+
+	/**
+	 * Wrapper method for the `setUp()` method for forward-compatibility with WP 5.9.
+	 */
+	public function set_up() {
+		static::setUp();
+	}
+
+	/**
+	 * Wrapper method for the `tearDown()` method for forward-compatibility with WP 5.9.
+	 */
+	public function tear_down() {
+		static::tearDown();
 	}
 }
