diff --git a/package.json b/package.json
index 4dca5023..98addb5a 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
   },
   "scripts": {
     "prepare": "husky install",
-    "test:php": "WP_TESTS_DIR=./.wp-tests-lib WP_DEVELOP_DIR=./.wp-core src/vendor/bin/phpunit -c phpunit.xml",
+    "test:php": "WP_TESTS_DIR=./.wp-tests-lib src/vendor/bin/phpunit -c phpunit.xml",
     "test:php:watch": "npm run test:php -- --testdox",
     "test:playwright": "playwright test -c tests/playwright/playwright.config.ts",
     "test:playwright:debug": "npm run test:playwright -- --debug",
diff --git a/tests/README.md b/tests/README.md
index 52135b6a..47653857 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -41,7 +41,7 @@ npm run test:php:watch
 
 Or run PHPUnit directly:
 ```bash
-WP_TESTS_DIR=./.wp-tests-lib WP_DEVELOP_DIR=./.wp-core src/vendor/bin/phpunit -c phpunit.xml
+WP_TESTS_DIR=./.wp-tests-lib src/vendor/bin/phpunit -c phpunit.xml
 ```
 
 ## What Gets Installed
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index f00d960f..cf9b5357 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -11,10 +11,6 @@
 		$_tests_dir = getenv( 'WP_TESTS_DIR' );
 		break;
 
-	case (bool) getenv( 'WP_DEVELOP_DIR' ):
-		$_tests_dir = getenv( 'WP_DEVELOP_DIR' ) . '/tests/phpunit';
-		break;
-
 	case (bool) getenv( 'WP_PHPUNIT__DIR' ):
 		$_tests_dir = getenv( 'WP_PHPUNIT__DIR' );
 		break;
diff --git a/tests/install.sh b/tests/install.sh
deleted file mode 100644
index d07b691f..00000000
--- a/tests/install.sh
+++ /dev/null
@@ -1,83 +0,0 @@
-#!/usr/bin/env bash
-
-echo "usage: $0 [wp-version] [db-name] [db-user] [db-pass] [db-host]"
-
-WP_VERSION=${1-stable}
-
-DB_NAME=${2-wordpress_test}
-DB_USER=${3-root}
-DB_PASS=${4-}
-DB_HOST=${5-localhost}
-
-export WP_DEVELOP_DIR=${WP_DEVELOP_DIR-/tmp/wordpress/}
-
-PROJECT_DIR=$(pwd)
-plugin_slug=$(basename ${PROJECT_DIR})
-
-set -ex
-
-install_wp() {
-	rm -rf ${WP_DEVELOP_DIR}
-	mkdir -p ${WP_DEVELOP_DIR}
-
-	git clone --depth=1 --quiet git://develop.git.wordpress.org/ ${WP_DEVELOP_DIR}/
-	cd ${WP_DEVELOP_DIR}
-
-	if [[ ${WP_VERSION} == 'latest' ]] || [[ ${WP_VERSION} == 'develop' ]]; then
-		export WP_VERSION='master'
-	elif [[ ${WP_VERSION} == 'stable' ]]; then
-		git fetch --tags --depth=1 --quiet
-		export WP_VERSION=$(git tag | sort -n | tail -1)
-	fi
-
-	git checkout ${WP_VERSION} --quiet
-}
-
-create_db() {
-	# parse DB_HOST for port or socket references
-	local PARTS=(${DB_HOST//\:/ })
-	local DB_HOSTNAME=${PARTS[0]};
-	local DB_SOCK_OR_PORT=${PARTS[1]};
-	local EXTRA=""
-
-	if ! [[ -z ${DB_HOSTNAME} ]] ; then
-		if [[ $(echo ${DB_SOCK_OR_PORT} | grep -e '^[0-9]\{1,\}$') ]]; then
-			EXTRA=" --host=$DB_HOSTNAME --port=$DB_SOCK_OR_PORT --protocol=tcp"
-		elif ! [[ -z ${DB_SOCK_OR_PORT} ]] ; then
-			EXTRA=" --socket=$DB_SOCK_OR_PORT"
-		elif ! [[ -z ${DB_HOSTNAME} ]] ; then
-			EXTRA=" --host=$DB_HOSTNAME --protocol=tcp"
-		fi
-	fi
-
-	# create database
-	mysql -e "DROP DATABASE IF EXISTS $DB_NAME; CREATE DATABASE $DB_NAME;" --user="$DB_USER" --password="$DB_PASS"${EXTRA}
-}
-
-config_test_suite() {
-	local opts='-i'
-
-	# portable in-place argument for both GNU sed and Mac OSX sed
-	if [[ $(uname -s) == 'Darwin' ]]; then
-		local opts='-i .bak'
-	fi
-
-    cp wp-tests-config-sample.php wp-tests-config.php
-
-	sed ${opts} "s/youremptytestdbnamehere/$DB_NAME/" wp-tests-config.php
-	sed ${opts} "s/yourusernamehere/$DB_USER/" wp-tests-config.php
-	sed ${opts} "s/yourpasswordhere/$DB_PASS/" wp-tests-config.php
-	sed ${opts} "s|localhost|${DB_HOST}|" wp-tests-config.php
-}
-
-install_plugin () {
-	if [[ -d ${PROJECT_DIR}/dist ]]
-	then
-        mv ${PROJECT_DIR}/dist ${WP_DEVELOP_DIR}/src/wp-content/plugins/${plugin_slug}
-    fi
-}
-
-install_wp
-create_db
-config_test_suite
-install_plugin