diff --git a/.distignore b/.distignore
index 4ef9356..9e09832 100644
--- a/.distignore
+++ b/.distignore
@@ -1,6 +1,7 @@
 .git
 assets/src
 bin
+codecove.yml
 node_modules
 tests
 .editorconfig
diff --git a/.travis.yml b/.travis.yml
index d582ca8..caa9c9f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
 dist: bionic
 language: php
 sudo: false
+
 notifications:
   email:
     on_success: never
@@ -37,15 +38,18 @@ install:
 script:
 - npm run install-build-tools
 - npm run test
-- npm run rmdist
-- npm run "build:production"
-- composer test
+- if [[ ${TRAVIS_PHP_VERSION:0:3} == "7.3" ]]; then composer require pcov/clobber; vendor/bin/pcov clobber; vendor/bin/phpunit --configuration phpunit.xml --coverage-clover coverage.xml; fi
+- if [[ ${TRAVIS_PHP_VERSION:0:3} != "7.3" ]]; then vendor/bin/phpunit --configuration phpunit.xml; fi
+- composer standards
+after_success:
+- bash <(curl -s https://codecov.io/bash)
 before_deploy:
 - export TRAVIS_PROJECT_SLUG="$(basename $TRAVIS_BUILD_DIR)"
 - curl -O https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar
 - chmod +x wp-cli.phar
 - sudo mv wp-cli.phar /usr/local/bin/wp
 - wp package install wp-cli/dist-archive-command
+- npm run build:production
 - composer install --no-dev --optimize-autoloader
 - cd ../
 - wp dist-archive $TRAVIS_PROJECT_SLUG $TRAVIS_BUILD_DIR/$TRAVIS_PROJECT_SLUG-$TRAVIS_TAG.zip
diff --git a/bin/install-wp-tests.sh b/bin/install-wp-tests.sh
new file mode 100755
index 0000000..38ca1f4
--- /dev/null
+++ b/bin/install-wp-tests.sh
@@ -0,0 +1,163 @@
+#!/usr/bin/env bash
+
+if [ $# -lt 3 ]; then
+	echo "usage: $0 <db-name> <db-user> <db-pass> [db-host] [wp-version] [skip-database-creation]"
+	exit 1
+fi
+
+DB_NAME=$1
+DB_USER=$2
+DB_PASS=$3
+DB_HOST=${4-localhost}
+WP_VERSION=${5-latest}
+SKIP_DB_CREATE=${6-false}
+
+TMPDIR=${TMPDIR-/tmp}
+TMPDIR=$(echo $TMPDIR | sed -e "s/\/$//")
+WP_TESTS_DIR=${WP_TESTS_DIR-$TMPDIR/wordpress-tests-lib}
+WP_CORE_DIR=${WP_CORE_DIR-$TMPDIR/wordpress/}
+
+download() {
+    if [ `which curl` ]; then
+        curl -s "$1" > "$2";
+    elif [ `which wget` ]; then
+        wget -nv -O "$2" "$1"
+    fi
+}
+
+if [[ $WP_VERSION =~ ^[0-9]+\.[0-9]+$ ]]; then
+	WP_TESTS_TAG="branches/$WP_VERSION"
+elif [[ $WP_VERSION =~ [0-9]+\.[0-9]+\.[0-9]+ ]]; then
+	if [[ $WP_VERSION =~ [0-9]+\.[0-9]+\.[0] ]]; then
+		# version x.x.0 means the first release of the major version, so strip off the .0 and download version x.x
+		WP_TESTS_TAG="tags/${WP_VERSION%??}"
+	else
+		WP_TESTS_TAG="tags/$WP_VERSION"
+	fi
+elif [[ $WP_VERSION == 'nightly' || $WP_VERSION == 'trunk' ]]; then
+	WP_TESTS_TAG="trunk"
+else
+	# http serves a single offer, whereas https serves multiple. we only want one
+	download http://api.wordpress.org/core/version-check/1.7/ /tmp/wp-latest.json
+	grep '[0-9]+\.[0-9]+(\.[0-9]+)?' /tmp/wp-latest.json
+	LATEST_VERSION=$(grep -o '"version":"[^"]*' /tmp/wp-latest.json | sed 's/"version":"//')
+	if [[ -z "$LATEST_VERSION" ]]; then
+		echo "Latest WordPress version could not be found"
+		exit 1
+	fi
+	WP_TESTS_TAG="tags/$LATEST_VERSION"
+fi
+
+set -ex
+
+install_wp() {
+
+	if [ -d $WP_CORE_DIR ]; then
+		return;
+	fi
+
+	mkdir -p $WP_CORE_DIR
+
+	if [[ $WP_VERSION == 'nightly' || $WP_VERSION == 'trunk' ]]; then
+		mkdir -p $TMPDIR/wordpress-nightly
+		download https://wordpress.org/nightly-builds/wordpress-latest.zip  $TMPDIR/wordpress-nightly/wordpress-nightly.zip
+		unzip -q $TMPDIR/wordpress-nightly/wordpress-nightly.zip -d $TMPDIR/wordpress-nightly/
+		mv $TMPDIR/wordpress-nightly/wordpress/* $WP_CORE_DIR
+	else
+		if [ $WP_VERSION == 'latest' ]; then
+			local ARCHIVE_NAME='latest'
+		elif [[ $WP_VERSION =~ [0-9]+\.[0-9]+ ]]; then
+			# https serves multiple offers, whereas http serves single.
+			download https://api.wordpress.org/core/version-check/1.7/ $TMPDIR/wp-latest.json
+			if [[ $WP_VERSION =~ [0-9]+\.[0-9]+\.[0] ]]; then
+				# version x.x.0 means the first release of the major version, so strip off the .0 and download version x.x
+				LATEST_VERSION=${WP_VERSION%??}
+			else
+				# otherwise, scan the releases and get the most up to date minor version of the major release
+				local VERSION_ESCAPED=`echo $WP_VERSION | sed 's/\./\\\\./g'`
+				LATEST_VERSION=$(grep -o '"version":"'$VERSION_ESCAPED'[^"]*' $TMPDIR/wp-latest.json | sed 's/"version":"//' | head -1)
+			fi
+			if [[ -z "$LATEST_VERSION" ]]; then
+				local ARCHIVE_NAME="wordpress-$WP_VERSION"
+			else
+				local ARCHIVE_NAME="wordpress-$LATEST_VERSION"
+			fi
+		else
+			local ARCHIVE_NAME="wordpress-$WP_VERSION"
+		fi
+		download https://wordpress.org/${ARCHIVE_NAME}.tar.gz  $TMPDIR/wordpress.tar.gz
+		tar --strip-components=1 -zxmf $TMPDIR/wordpress.tar.gz -C $WP_CORE_DIR
+	fi
+
+	download https://raw.github.com/markoheijnen/wp-mysqli/master/db.php $WP_CORE_DIR/wp-content/db.php
+}
+
+install_pressbooks() {
+	if [ -d $WP_CORE_DIR/wp-content/plugins/pressbooks ]; then
+		cd $WP_CORE_DIR/wp-content/plugins/pressbooks && git pull
+		return;
+	fi
+
+	git clone --depth=1 https://github.com/pressbooks/pressbooks.git $WP_CORE_DIR/wp-content/plugins/pressbooks
+	cd $WP_CORE_DIR/wp-content/plugins/pressbooks && composer install --no-dev --optimize-autoloader
+}
+
+install_test_suite() {
+	# portable in-place argument for both GNU sed and Mac OSX sed
+	if [[ $(uname -s) == 'Darwin' ]]; then
+		local ioption='-i .bak'
+	else
+		local ioption='-i'
+	fi
+
+	# set up testing suite if it doesn't yet exist
+	if [ ! -d $WP_TESTS_DIR ]; then
+		# set up testing suite
+		mkdir -p $WP_TESTS_DIR
+		svn co --quiet https://develop.svn.wordpress.org/${WP_TESTS_TAG}/tests/phpunit/includes/ $WP_TESTS_DIR/includes
+		svn co --quiet https://develop.svn.wordpress.org/${WP_TESTS_TAG}/tests/phpunit/data/ $WP_TESTS_DIR/data
+	fi
+
+	if [ ! -f wp-tests-config.php ]; then
+		download https://develop.svn.wordpress.org/${WP_TESTS_TAG}/wp-tests-config-sample.php "$WP_TESTS_DIR"/wp-tests-config.php
+		# remove all forward slashes in the end
+		WP_CORE_DIR=$(echo $WP_CORE_DIR | sed "s:/\+$::")
+		sed $ioption "s:dirname( __FILE__ ) . '/src/':'$WP_CORE_DIR/':" "$WP_TESTS_DIR"/wp-tests-config.php
+		sed $ioption "s/youremptytestdbnamehere/$DB_NAME/" "$WP_TESTS_DIR"/wp-tests-config.php
+		sed $ioption "s/yourusernamehere/$DB_USER/" "$WP_TESTS_DIR"/wp-tests-config.php
+		sed $ioption "s/yourpasswordhere/$DB_PASS/" "$WP_TESTS_DIR"/wp-tests-config.php
+		sed $ioption "s|localhost|${DB_HOST}|" "$WP_TESTS_DIR"/wp-tests-config.php
+	fi
+
+}
+
+install_db() {
+
+	if [ ${SKIP_DB_CREATE} = "true" ]; then
+		return 0
+	fi
+
+	# parse DB_HOST for port or socket references
+	local PARTS=(${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
+	mysqladmin create $DB_NAME --user="$DB_USER" --password="$DB_PASS"$EXTRA
+}
+
+install_wp
+install_pressbooks
+install_test_suite
+install_db
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000..db30c7a
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,26 @@
+codecov:
+  notify:
+    require_ci_to_pass: yes
+
+coverage:
+  precision: 2
+  round: down
+  range: "70...100"
+
+  status:
+    project: yes
+    patch: yes
+    changes: no
+
+parsers:
+  gcov:
+    branch_detection:
+      conditional: yes
+      loop: yes
+      method: no
+      macro: no
+
+comment:
+  layout: "header, diff"
+  behavior: default
+require_changes: no
diff --git a/composer.json b/composer.json
index b68517a..036359e 100644
--- a/composer.json
+++ b/composer.json
@@ -30,12 +30,15 @@
 		"spatie/color": "^1.1"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "~6.5",
+		"phpunit/phpunit": "^7",
 		"pressbooks/coding-standards": "^1.0",
 		"wpreadme2markdown/wp2md": "^3.0"
 	},
 	"scripts": {
-		"test": ["@standards"],
+		"test": [
+      "vendor/bin/phpunit --configuration phpunit.xml --coverage-clover coverage.xml",
+      "@standards"
+    ],
 		"standards": [
 			"vendor/bin/phpcs --standard=phpcs.ruleset.xml inc partials *.php"
 		],
diff --git a/composer.lock b/composer.lock
index 9ba3b83..27922b5 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,32 +4,35 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "a4d200c009d1bd4aa40e56ca2ff335b2",
+    "content-hash": "d8d8b043ab5da08715e6d21993616f9e",
     "packages": [
         {
             "name": "composer/installers",
-            "version": "v1.7.0",
+            "version": "v1.9.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/installers.git",
-                "reference": "141b272484481432cda342727a427dc1e206bfa0"
+                "reference": "b93bcf0fa1fccb0b7d176b0967d969691cd74cca"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/installers/zipball/141b272484481432cda342727a427dc1e206bfa0",
-                "reference": "141b272484481432cda342727a427dc1e206bfa0",
+                "url": "https://api.github.com/repos/composer/installers/zipball/b93bcf0fa1fccb0b7d176b0967d969691cd74cca",
+                "reference": "b93bcf0fa1fccb0b7d176b0967d969691cd74cca",
                 "shasum": ""
             },
             "require": {
-                "composer-plugin-api": "^1.0"
+                "composer-plugin-api": "^1.0 || ^2.0"
             },
             "replace": {
                 "roundcube/plugin-installer": "*",
                 "shama/baton": "*"
             },
             "require-dev": {
-                "composer/composer": "1.0.*@dev",
-                "phpunit/phpunit": "^4.8.36"
+                "composer/composer": "1.6.* || 2.0.*@dev",
+                "composer/semver": "1.0.* || 2.0.*@dev",
+                "phpunit/phpunit": "^4.8.36",
+                "sebastian/comparator": "^1.2.4",
+                "symfony/process": "^2.3"
             },
             "type": "composer-plugin",
             "extra": {
@@ -65,6 +68,7 @@
                 "Kanboard",
                 "Lan Management System",
                 "MODX Evo",
+                "MantisBT",
                 "Mautic",
                 "Maya",
                 "OXID",
@@ -119,6 +123,7 @@
                 "shopware",
                 "silverstripe",
                 "sydes",
+                "sylius",
                 "symfony",
                 "typo3",
                 "wordpress",
@@ -126,7 +131,17 @@
                 "zend",
                 "zikula"
             ],
-            "time": "2019-08-12T15:00:31+00:00"
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-04-07T06:57:05+00:00"
         },
         {
             "name": "pressbooks/mix",
@@ -264,36 +279,31 @@
     "packages-dev": [
         {
             "name": "doctrine/instantiator",
-            "version": "1.2.0",
+            "version": "1.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "a2c590166b2133a4633738648b6b064edae0814a"
+                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/a2c590166b2133a4633738648b6b064edae0814a",
-                "reference": "a2c590166b2133a4633738648b6b064edae0814a",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/d56bf6102915de5702778fe20f2de3b2fe570b5b",
+                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "require-dev": {
-                "doctrine/coding-standard": "^6.0",
+                "doctrine/coding-standard": "^8.0",
                 "ext-pdo": "*",
                 "ext-phar": "*",
-                "phpbench/phpbench": "^0.13",
-                "phpstan/phpstan-phpunit": "^0.11",
-                "phpstan/phpstan-shim": "^0.11",
-                "phpunit/phpunit": "^7.0"
+                "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",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.2.x-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
@@ -307,7 +317,7 @@
                 {
                     "name": "Marco Pivetta",
                     "email": "ocramius@gmail.com",
-                    "homepage": "http://ocramius.github.com/"
+                    "homepage": "https://ocramius.github.io/"
                 }
             ],
             "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
@@ -316,7 +326,21 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2019-03-17T17:37:11+00:00"
+            "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": "fig-r/psr2r-sniffer",
@@ -396,20 +420,20 @@
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.9.3",
+            "version": "1.10.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea"
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/007c053ae6f31bba39dfa19a7726f56e9763bbea",
-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/776f831124e9c62e1a2c601ecc52e776d8bb7220",
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "replace": {
                 "myclabs/deep-copy": "self.version"
@@ -440,26 +464,32 @@
                 "object",
                 "object graph"
             ],
-            "time": "2019-08-09T12:45:53+00:00"
+            "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": "1.0.1",
+            "version": "1.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/manifest.git",
-                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0"
+                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phar-io/manifest/zipball/2df402786ab5368a0169091f61a7c1e0eb6852d0",
-                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
+                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
                 "ext-phar": "*",
-                "phar-io/version": "^1.0.1",
+                "phar-io/version": "^2.0",
                 "php": "^5.6 || ^7.0"
             },
             "type": "library",
@@ -495,20 +525,20 @@
                 }
             ],
             "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
-            "time": "2017-03-05T18:14:27+00:00"
+            "time": "2018-07-08T19:23:20+00:00"
         },
         {
             "name": "phar-io/version",
-            "version": "1.0.1",
+            "version": "2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/version.git",
-                "reference": "a70c0ced4be299a63d32fa96d9281d03e94041df"
+                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phar-io/version/zipball/a70c0ced4be299a63d32fa96d9281d03e94041df",
-                "reference": "a70c0ced4be299a63d32fa96d9281d03e94041df",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/45a2ec53a73c70ce41d55cedef9063630abaf1b6",
+                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6",
                 "shasum": ""
             },
             "require": {
@@ -542,28 +572,25 @@
                 }
             ],
             "description": "Library for handling version information and constraints",
-            "time": "2017-03-05T17:38:23+00:00"
+            "time": "2018-07-08T19:19:57+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",
-            "version": "2.0.0",
+            "version": "2.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a"
+                "reference": "6568f4687e5b41b054365f9ae03fcb1ed5f2069b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/63a995caa1ca9e5590304cd845c15ad6d482a62a",
-                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/6568f4687e5b41b054365f9ae03fcb1ed5f2069b",
+                "reference": "6568f4687e5b41b054365f9ae03fcb1ed5f2069b",
                 "shasum": ""
             },
             "require": {
                 "php": ">=7.1"
             },
-            "require-dev": {
-                "phpunit/phpunit": "~6"
-            },
             "type": "library",
             "extra": {
                 "branch-alias": {
@@ -594,20 +621,20 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2018-08-07T13:53:10+00:00"
+            "time": "2020-04-27T09:25:28+00:00"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
-            "version": "4.3.2",
+            "version": "4.3.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "b83ff7cfcfee7827e1e78b637a5904fe6a96698e"
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                 "ext-mbstring": "For best performance"
@@ -2042,7 +2132,11 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.8-dev"
+                    "dev-main": "1.20-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
                 }
             },
             "autoload": {
@@ -2076,7 +2170,21 @@
                 "portable",
                 "shim"
             ],
-            "time": "2018-04-26T10:06:28+00:00"
+            "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": "2020-10-23T14:02:19+00:00"
         },
         {
             "name": "theseer/tokenizer",
@@ -2120,31 +2228,30 @@
         },
         {
             "name": "webmozart/assert",
-            "version": "1.5.0",
+            "version": "1.9.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/webmozart/assert.git",
-                "reference": "88e6d84706d09a236046d686bbea96f07b3a34f4"
+                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/88e6d84706d09a236046d686bbea96f07b3a34f4",
-                "reference": "88e6d84706d09a236046d686bbea96f07b3a34f4",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.3 || ^7.0",
+                "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",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.3-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "Webmozart\\Assert\\": "src/"
@@ -2166,7 +2273,7 @@
                 "check",
                 "validate"
             ],
-            "time": "2019-08-24T08:43:50+00:00"
+            "time": "2020-07-08T17:02:28+00:00"
         },
         {
             "name": "wp-coding-standards/wpcs",
@@ -2210,24 +2317,25 @@
         },
         {
             "name": "wpreadme2markdown/wp2md",
-            "version": "3.0.1",
+            "version": "3.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/wpreadme2markdown/wp2md.git",
-                "reference": "6fec3a213080e32a5d53a235f89c6cf4d910572a"
+                "reference": "d87a617d72bc20d6c5e08c7204fe07bad8a8e7a2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/wpreadme2markdown/wp2md/zipball/6fec3a213080e32a5d53a235f89c6cf4d910572a",
-                "reference": "6fec3a213080e32a5d53a235f89c6cf4d910572a",
+                "url": "https://api.github.com/repos/wpreadme2markdown/wp2md/zipball/d87a617d72bc20d6c5e08c7204fe07bad8a8e7a2",
+                "reference": "d87a617d72bc20d6c5e08c7204fe07bad8a8e7a2",
                 "shasum": ""
             },
             "require": {
                 "php": ">= 5.5.9",
-                "symfony/console": "^3.2|^4.0",
+                "symfony/console": "^3.2|^4.0|^5.0",
                 "wpreadme2markdown/wpreadme2markdown": "^3.0.1"
             },
             "require-dev": {
+                "ext-json": "*",
                 "indeyets/pake": "~1.99",
                 "secondtruth/phar-compiler": "~1.1"
             },
@@ -2260,20 +2368,20 @@
                 "readme",
                 "wordpress"
             ],
-            "time": "2017-11-24T21:19:21+00:00"
+            "time": "2019-12-02T21:26:35+00:00"
         },
         {
             "name": "wpreadme2markdown/wpreadme2markdown",
-            "version": "3.0.1",
+            "version": "3.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/wpreadme2markdown/wp-readme-to-markdown.git",
-                "reference": "8066915828bb05a12b44360cda986e1d9e60047e"
+                "reference": "61a5f3077472a37b3a111bbb37088f93cae5c55c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/wpreadme2markdown/wp-readme-to-markdown/zipball/8066915828bb05a12b44360cda986e1d9e60047e",
-                "reference": "8066915828bb05a12b44360cda986e1d9e60047e",
+                "url": "https://api.github.com/repos/wpreadme2markdown/wp-readme-to-markdown/zipball/61a5f3077472a37b3a111bbb37088f93cae5c55c",
+                "reference": "61a5f3077472a37b3a111bbb37088f93cae5c55c",
                 "shasum": ""
             },
             "require": {
@@ -2305,7 +2413,7 @@
                 "readme",
                 "wordpress"
             ],
-            "time": "2017-11-24T20:36:13+00:00"
+            "time": "2020-08-07T00:24:42+00:00"
         }
     ],
     "aliases": [],
@@ -2319,5 +2427,6 @@
     "platform-dev": [],
     "platform-overrides": {
         "php": "7.1"
-    }
+    },
+    "plugin-api-version": "1.1.0"
 }
diff --git a/phpcs.xml.dist b/phpcs.xml.dist
deleted file mode 100644
index 5a4ab66..0000000
--- a/phpcs.xml.dist
+++ /dev/null
@@ -1,60 +0,0 @@
-<?xml version="1.0"?>
-<ruleset name="WordPress Theme Coding Standards">
-	<!-- See https://github.com/squizlabs/PHP_CodeSniffer/wiki/Annotated-ruleset.xml -->
-	<!-- See https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards -->
-	<!-- See https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/wiki -->
-	<!-- See https://github.com/wimg/PHPCompatibility -->
-
-	<!-- Set a description for this ruleset. -->
-	<description>A custom set of code standard rules to check for WordPress themes.</description>
-
-	<!-- Pass some flags to PHPCS:
-		 p flag: Show progress of the run.
-		 s flag: Show sniff codes in all reports.
-		 v flag: Print verbose output.
-		 n flag: Do not print warnings.
-	-->
-	<arg value="psvn"/>
-
-	<!-- Only check the PHP, CSS and SCSS files. JS files are checked separately with JSCS and JSHint. -->
-	<arg name="extensions" value="php,css,scss/css"/>
-
-	<!-- Check all files in this directory and the directories below it. -->
-	<file>.</file>
-
-	<!-- Include the WordPress ruleset, with exclusions. -->
-	<rule ref="WordPress">
-		<exclude name="Generic.WhiteSpace.ScopeIndent.IncorrectExact" />
-		<exclude name="Generic.WhiteSpace.ScopeIndent.Incorrect" />
-		<exclude name="PEAR.Functions.FunctionCallSignature.Indent" />
-	</rule>
-
-	<!-- Verify that the text_domain is set to the desired text-domain.
-		 Multiple valid text domains can be provided as a comma-delimited list. -->
-	<rule ref="WordPress.WP.I18n">
-		<properties>
-			<property name="text_domain" type="array" value="_s" />
-		</properties>
-	</rule>
-
-	<!-- Allow for theme specific exceptions to the file name rules based
-		 on the theme hierarchy. -->
-	<rule ref="WordPress.Files.FileName">
-		<properties>
-			<property name="is_theme" value="true" />
-		</properties>
-	</rule>
-
-	<!-- Verify that no WP functions are used which are deprecated or have been removed.
-		 The minimum version set here should be in line with the minimum WP version
-		 as set in the "Requires at least" tag in the readme.txt file. -->
-	<rule ref="WordPress.WP.DeprecatedFunctions">
-		<properties>
-			<property name="minimum_supported_version" value="4.0" />
-		</properties>
-	</rule>
-
-	<!-- Include sniffs for PHP cross-version compatibility. -->
-	<config name="testVersion" value="5.2-99.0"/>
-	<rule ref="PHPCompatibility"/>
-</ruleset>
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..2690e85
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0"?>
+<phpunit
+	bootstrap="tests/bootstrap.php"
+	backupGlobals="false"
+	colors="true"
+	convertErrorsToExceptions="true"
+	convertNoticesToExceptions="true"
+	convertWarningsToExceptions="true"
+	>
+	<php>
+		<const name="WP_TESTS_MULTISITE" value="1" />
+	</php>
+	<testsuites>
+		<testsuite name="Pressbooks Aldine">
+			<directory prefix="test-" suffix=".php">./tests/</directory>
+		</testsuite>
+	</testsuites>
+	<filter>
+		<whitelist>
+			<directory suffix=".php">./inc</directory>
+		</whitelist>
+</filter>
+</phpunit>
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
new file mode 100644
index 0000000..04123b6
--- /dev/null
+++ b/tests/bootstrap.php
@@ -0,0 +1,56 @@
+<?php
+/**
+ * PHPUnit bootstrap file
+ *
+ * @package Pressbooks_Aldine
+ */
+
+$_tests_dir = getenv( 'WP_TESTS_DIR' );
+if ( ! $_tests_dir ) {
+	$_tests_dir = rtrim( sys_get_temp_dir(), '/\\' ) . '/wordpress-tests-lib';
+}
+
+if ( ! file_exists( $_tests_dir . '/includes/functions.php' ) ) {
+	throw new Exception( "Could not find $_tests_dir/includes/functions.php, have you run bin/install-wp-tests.sh ?" );
+}
+
+// Give access to tests_add_filter() function.
+require_once $_tests_dir . '/includes/functions.php';
+
+function _manually_load_plugin() {
+	$_pressbooks = '/tmp/wordpress/wp-content/plugins/pressbooks/pressbooks.php';
+	if ( file_exists( $_pressbooks ) ) {
+		require_once( $_pressbooks );
+	} else {
+		require_once( __DIR__ . '/../../../plugins/pressbooks/pressbooks.php' );
+	}
+}
+
+/**
+ * Registers theme
+ */
+function _register_theme() {
+
+	$theme_dir = dirname( __DIR__ );
+	$current_theme = basename( $theme_dir );
+	$theme_root = dirname( $theme_dir );
+
+	add_filter( 'theme_root', function() use ( $theme_root ) {
+		return $theme_root;
+	} );
+
+	register_theme_directory( $theme_root );
+
+	add_filter( 'pre_option_template', function() use ( $current_theme ) {
+		return $current_theme;
+	});
+	add_filter( 'pre_option_stylesheet', function() use ( $current_theme ) {
+		return $current_theme;
+	});
+}
+tests_add_filter( 'muplugins_loaded', '_register_theme' );
+tests_add_filter( 'muplugins_loaded', '_manually_load_plugin' );
+
+
+// Start up the WP testing environment.
+require $_tests_dir . '/includes/bootstrap.php';
diff --git a/tests/test-filters.php b/tests/test-filters.php
new file mode 100644
index 0000000..ef372e3
--- /dev/null
+++ b/tests/test-filters.php
@@ -0,0 +1,17 @@
+<?php
+/**
+ * Class Filters
+ *
+ * @package Pressbooks_Aldine
+ */
+
+/**
+ * Filters test case.
+ */
+class FiltersTest extends WP_UnitTestCase {
+	public function test_register_query_vars() {
+		$vars = \Aldine\Helpers\register_query_vars([]);
+		$this->assertContains('license', $vars);
+		$this->assertContains('subject', $vars);
+	}
+}