Add a minimum supported WordPress version check with WPCompat

CONTRIBUTING.md

@@ -66,7 +66,7 @@ These are the steps to take to release a new version of User Switching (for cont
 1. Check [the milestone on GitHub](https://github.com/johnbillion/user-switching/milestones) for open issues or PRs. Fix or reassign as necessary.
 1. If this is a non-patch release, check issues and PRs assigned to the patch or minor milestones that will get skipped. Reassign as necessary.
 1. Ensure you're on the `develop` branch and all the changes for this release have been merged in.
-1. Ensure `readme.md` contains up to date descriptions, "Tested up to" versions, FAQs, screenshots, etc.
+1. Ensure `phpstan.neon.dist` and `readme.md` contain up to date "Tested up to" versions, descriptions, FAQs, screenshots, etc.
 1. Ensure `.gitattributes` is up to date with all files that shouldn't be part of the build.
    - To do this, run `git archive --output=user-switching.zip HEAD` then check the contents for files that shouldn't be part of the package.
 1. Run `composer test` and ensure everything passes.

composer.json

@@ -31,9 +31,10 @@
 		"codeception/module-webdriver": "^1.0",
 		"codeception/util-universalframework": "^1.0",
 		"johnbillion/plugin-infrastructure": "dev-trunk",
+		"johnbillion/wp-compat": "0.1.0",
 		"lucatume/wp-browser": "3.2.3",
 		"phpcompatibility/phpcompatibility-wp": "2.1.5",
-		"phpstan/phpstan": "1.11.8",
+		"phpstan/phpstan": "1.12.2",
 		"phpstan/phpstan-phpunit": "1.4.0",
 		"roots/wordpress-core-installer": "1.100.0",
 		"roots/wordpress-full": "*",
@@ -83,7 +84,7 @@
 		],
 		"test:phpstan": [
 			"codecept build",
-			"phpstan analyze --memory-limit=1024M"
+			"phpstan analyze -v --memory-limit=1024M"
 		],
 		"test:start": [
 			"tests-start"

phpstan.neon.dist

@@ -2,6 +2,7 @@ includes:
 	- vendor/phpstan/phpstan-phpunit/extension.neon
 	- vendor/szepeviktor/phpstan-wordpress/extension.neon
 	- vendor/johnbillion/plugin-infrastructure/phpstan/extension.neon
+	- vendor/johnbillion/wp-compat/extension.neon
 parameters:
 	level: 9
 	paths:
@@ -22,3 +23,5 @@ parameters:
 			message: '#^Unreachable statement#'
 			path: user-switching.php
 			count: 3
+	WPCompat:
+		requiresAtLeast: '5.8'

tests/integration/PluginTest.php

@@ -38,7 +38,9 @@ private function get_readme(): ?array {
 
 			$file_contents = implode( '', $file_array );
 
-			preg_match( '|Stable tag:(.*)|i', $file_contents, $_stable_tag );
+			if ( preg_match( '|Stable tag:(.*)|i', $file_contents, $_stable_tag ) !== 1 ) {
+				return null;
+			}
 
 			$this->readme_data = array(
 				'stable_tag' => trim( trim( $_stable_tag[1], '*' ) )