diff --git a/package-lock.json b/package-lock.json
index 8f7ec84..84b8de1 100644
--- a/package-lock.json
+++ b/package-lock.json
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-					}
-				},
-				"has-flag": {
-					"version": "2.0.0",
-					"resolved": "https://registry.npmjs.org/has-flag/-/has-flag-2.0.0.tgz",
-					"integrity": "sha1-6CB68cx7MNRGzHC3NLXovhj4jVE=",
-					"dev": true
-				},
-				"supports-color": {
-					"version": "4.5.0",
-					"resolved": "https://registry.npmjs.org/supports-color/-/supports-color-4.5.0.tgz",
-					"integrity": "sha1-vnoN5ITexcXN34s9WRJQRJEvY1s=",
-					"dev": true,
-					"requires": {
-						"has-flag": "^2.0.0"
-					}
-				}
-			}
-		},
 		"prismjs": {
 			"version": "1.24.1",
 			"resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.24.1.tgz",
@@ -10812,18 +10520,6 @@
 				"schema-utils": "^1.0.0"
 			}
 		},
-		"rc": {
-			"version": "1.2.8",
-			"resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
-			"integrity": "sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==",
-			"dev": true,
-			"requires": {
-				"deep-extend": "^0.6.0",
-				"ini": "~1.3.0",
-				"minimist": "^1.2.0",
-				"strip-json-comments": "~2.0.1"
-			}
-		},
 		"react": {
 			"version": "16.14.0",
 			"resolved": "https://registry.npmjs.org/react/-/react-16.14.0.tgz",
@@ -11994,23 +11690,6 @@
 			"integrity": "sha512-VUJ49FC8U1OxwZLxIbTTrDvLnf/6TDgxZcK8wxR8zs13xpx7xbG60ndBlhNrFi2EMuFRoeDoJO7wthSLq42EjA==",
 			"dev": true
 		},
-		"simple-concat": {
-			"version": "1.0.1",
-			"resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.1.tgz",
-			"integrity": "sha512-cSFtAPtRhljv69IK0hTVZQ+OfE9nePi/rtJmw5UjHeVyVroEqJXP1sFztKUy1qU+xvz3u/sfYJLa947b7nAN2Q==",
-			"dev": true
-		},
-		"simple-get": {
-			"version": "3.1.0",
-			"resolved": "https://registry.npmjs.org/simple-get/-/simple-get-3.1.0.tgz",
-			"integrity": "sha512-bCR6cP+aTdScaQCnQKbPKtJOKDp/hj9EDLJo3Nw4y1QksqaovlW/bnptB6/c1e+qmNIDHRK+oXFDdEqBT8WzUA==",
-			"dev": true,
-			"requires": {
-				"decompress-response": "^4.2.0",
-				"once": "^1.3.1",
-				"simple-concat": "^1.0.0"
-			}
-		},
 		"simplebar": {
 			"version": "4.2.3",
 			"resolved": "https://registry.npmjs.org/simplebar/-/simplebar-4.2.3.tgz",
@@ -12612,12 +12291,6 @@
 				"min-indent": "^1.0.0"
 			}
 		},
-		"strip-json-comments": {
-			"version": "2.0.1",
-			"resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
-			"integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
-			"dev": true
-		},
 		"style-loader": {
 			"version": "0.23.1",
 			"resolved": "https://registry.npmjs.org/style-loader/-/style-loader-0.23.1.tgz",
@@ -13255,44 +12928,6 @@
 			"integrity": "sha512-4WK/bYZmj8xLr+HUCODHGF1ZFzsYffasLUgEiMBY4fgtltdO6B4WJtlSbPaDTLpYTcGVwM2qLnFTICEcNxs3kA==",
 			"dev": true
 		},
-		"tar-fs": {
-			"version": "2.1.1",
-			"resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-2.1.1.tgz",
-			"integrity": "sha512-V0r2Y9scmbDRLCNex/+hYzvp/zyYjvFbHPNgVTKfQvVrb6guiE/fxP+XblDNR011utopbkex2nM4dHNV6GDsng==",
-			"dev": true,
-			"requires": {
-				"chownr": "^1.1.1",
-				"mkdirp-classic": "^0.5.2",
-				"pump": "^3.0.0",
-				"tar-stream": "^2.1.4"
-			}
-		},
-		"tar-stream": {
-			"version": "2.2.0",
-			"resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.2.0.tgz",
-			"integrity": "sha512-ujeqbceABgwMZxEJnk2HDY2DlnUZ+9oEcb1KzTVfYHio0UE6dG71n60d8D2I4qNvleWrrXpmjpt7vZeF1LnMZQ==",
-			"dev": true,
-			"requires": {
-				"bl": "^4.0.3",
-				"end-of-stream": "^1.4.1",
-				"fs-constants": "^1.0.0",
-				"inherits": "^2.0.3",
-				"readable-stream": "^3.1.1"
-			},
-			"dependencies": {
-				"readable-stream": {
-					"version": "3.6.0",
-					"resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
-					"integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
-					"dev": true,
-					"requires": {
-						"inherits": "^2.0.3",
-						"string_decoder": "^1.1.1",
-						"util-deprecate": "^1.0.1"
-					}
-				}
-			}
-		},
 		"telejson": {
 			"version": "3.3.0",
 			"resolved": "https://registry.npmjs.org/telejson/-/telejson-3.3.0.tgz",
@@ -13538,6 +13173,7 @@
 			"resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
 			"integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
 			"dev": true,
+			"optional": true,
 			"requires": {
 				"safe-buffer": "^5.0.1"
 			}
@@ -14367,12 +14003,6 @@
 				"is-symbol": "^1.0.3"
 			}
 		},
-		"which-pm-runs": {
-			"version": "1.0.0",
-			"resolved": "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz",
-			"integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs=",
-			"dev": true
-		},
 		"wide-align": {
 			"version": "1.1.3",
 			"resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
diff --git a/package.json b/package.json
index 5955b41..42ba0d3 100644
--- a/package.json
+++ b/package.json
@@ -3,14 +3,12 @@
 	"scripts": {
 		"start": "bash dev-scripts/setup-storybook.sh && start-storybook --quiet -p 6006 -s resources/skins.vector.styles",
 		"test": "npm -s run lint && tsc && npm -s run doc",
-		"test:size": "node ./tests/resource-loader-bundlesize.js",
 		"lint": "npm -s run lint:js && npm -s run lint:styles && npm -s run lint:i18n",
 		"lint:fix:js": "npm -s run lint:js -- --fix",
 		"lint:fix:styles": "npm -s run lint:styles -- --fix",
 		"lint:js": "eslint --cache .",
 		"lint:styles": "stylelint \"**/*.{less,css}\"",
 		"lint:i18n": "banana-checker --requireLowerCase=0 i18n/",
-		"selenium-test": "npm -s run test:size",
 		"doc": "jsdoc -c jsdoc.json && npm run build-storybook -s resources/skins.vector.styles",
 		"build-storybook": "bash dev-scripts/setup-storybook.sh && build-storybook --quiet --loglevel warn -o docs/ui",
 		"minify-svg": "svgo --config=.svgo.config.js -q -r -f resources/",
@@ -26,7 +24,6 @@
 		"@wikimedia/types-wikimedia": "0.2.0",
 		"@wikimedia/wvui": "0.3.0",
 		"babel-loader": "8.0.6",
-		"bundlesize": "0.18.1",
 		"eslint-config-wikimedia": "0.20.0",
 		"grunt-banana-checker": "0.9.0",
 		"jsdoc": "3.6.7",
diff --git a/tests/phpunit/structure/BundleSizeTest.php b/tests/phpunit/structure/BundleSizeTest.php
new file mode 100644
index 0000000..65832e3
--- /dev/null
+++ b/tests/phpunit/structure/BundleSizeTest.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace MediaWiki\Skins\Vector\Tests\Structure;
+
+class BundleSizeTest extends \MediaWiki\Tests\Structure\BundleSizeTest {
+
+	/** @inheritDoc */
+	public function getBundleSizeConfig(): string {
+		return dirname( __DIR__, 3 ) . '/bundlesize.config.json';
+	}
+}
diff --git a/tests/resource-loader-bundlesize.js b/tests/resource-loader-bundlesize.js
deleted file mode 100644
index 676a76c..0000000
--- a/tests/resource-loader-bundlesize.js
+++ /dev/null
@@ -1,66 +0,0 @@
-/**
- * ResourceLoader module bandwidth test
- *
- * Fetches a series of ResourceLoader modules from a ResourceLoader URI and
- * pipes their content into a bundlesize command which validates their bytesize
- * against a configuration in in ../bundlesize.config.json.
- */
-
-const
-	MW_SERVER = process.env.MW_SERVER || 'http://127.0.0.1:8080',
-	MW_SCRIPT_PATH = process.env.MW_SCRIPT_PATH || '/w',
-	childProcess = require( 'child_process' ),
-	fetch = require( 'node-fetch' ).default,
-	bundles = require( '../bundlesize.config.json' ),
-	// eslint-disable-next-line es/no-object-assign
-	bundlesizeEnv = Object.assign( {}, process.env );
-
-/**
- * Create a ResourceLoader URL based on $MW_SERVER and $MW_SCRIPT_PATH
- *
- * @param {string} rlModuleName
- * @return {string}
- */
-function createRLUrl( rlModuleName ) {
-	return `${MW_SERVER}${MW_SCRIPT_PATH}/load.php?lang=en&modules=${rlModuleName}`;
-}
-
-/**
- * Remove the "CI" environment variable so that it is not passed to
- * the bundlesize command, resulting in an unnecessary "Github token not found"
- * warning. Note: assigning to null or undefined doesn't work because Node casts
- * environment variable values to strings.
- */
-delete bundlesizeEnv.CI;
-
-/**
- * Fetch each ResourceLoader module defined in the bundlesize config
- * and pipe it's content into a bundlesize command.
- * The bundlesize stdout and stderr are passed to the parent process,
- * so any error in bundlesize will trigger a non-zero exit status for this script.
- */
-bundles.forEach( async ( rlModule ) => {
-	const rlModuleResponse = await fetch( createRLUrl( rlModule.resourceModule ) ),
-		rlModuleContent = await rlModuleResponse.text();
-
-	// Execute the bundlesize command.
-	const cmd = childProcess.spawn(
-		'node_modules/.bin/bundlesize-pipe',
-		[ '--name', rlModule.resourceModule, '--max-size', rlModule.maxSize ],
-		{
-			// Stdin is writable stream, stdout and stderr are passed to the parent process.
-			stdio: [ 'pipe', 'inherit', 'inherit' ],
-			env: bundlesizeEnv
-		}
-	);
-
-	cmd.stdin.write( rlModuleContent );
-	cmd.stdin.end();
-
-	cmd.on( 'exit', ( code ) => {
-		if ( code !== 0 ) {
-			process.exitCode = code || 1; // prevent assigning falsy values.
-		}
-	} );
-
-} );