add test for #633

test/function/external-normalization/_config.js

@@ -0,0 +1,18 @@
+var path = require( 'path' );
+var assert = require( 'assert' );
+
+module.exports = {
+	description: 'external paths from custom resolver remain external (#633)',
+	options: {
+		external: [ 'path' ],
+		plugins: [{
+			resolveId: ( id ) => {
+				if ( id == './dep.js' ) return 'path';
+				return id;
+			}
+		}]
+	},
+	exports: exports => {
+		assert.equal( exports, path.resolve );
+	}
+};

test/function/external-normalization/main.js

@@ -0,0 +1,2 @@
+import { resolve } from './dep.js';
+export default resolve;