Try to reduce test to prevent ordering issues

test/cli/samples/warn-multiple/_config.js

@@ -6,32 +6,17 @@ module.exports = {
 	stderr: stderr =>
 		assertStderrIncludes(
 			stderr,
-			'(!) Mixing named and default exports\n' +
-				"Consumers of your bundle will have to use bundle['default'] to access the default export, which may not be what you want. Use `output.exports: 'named'` to disable this warning\n" +
-				'(!) Missing shims for Node.js built-ins\n' +
-				"Creating a browser bundle that depends on 'url' and 'assert'. You might need to include https://www.npmjs.com/package/rollup-plugin-node-builtins\n" +
-				'(!) Missing global variable names\n' +
-				'Use output.globals to specify browser global variable names corresponding to external modules\n' +
-				"url (guessing 'url')\n" +
-				"assert (guessing 'assert')\n" +
+			'(!) Missing shims for Node.js built-ins\n' +
+				"Creating a browser bundle that depends on 'url', 'assert' and 'path'. You might need to include https://www.npmjs.com/package/rollup-plugin-node-builtins\n" +
 				'(!) Import of non-existent export\n' +
 				'main.js\n' +
 				"4: import assert from 'assert';\n" +
-				"5: import 'external';\n" +
+				"5: import path from 'path';\n" +
 				"6: import {doesNotExist} from './dep.js';\n" +
 				'           ^\n' +
 				'7: \n' +
-				'8: console.log(this);\n' +
-				'(!) `this` has been rewritten to `undefined`\n' +
-				'https://rollupjs.org/guide/en/#error-this-is-undefined\n' +
-				'main.js\n' +
-				" 6: import {doesNotExist} from './dep.js';\n" +
-				' 7: \n' +
-				' 8: console.log(this);\n' +
-				'                ^\n' +
-				' 9: \n' +
-				'10: export {url, assert as default};\n' +
-				'(!) Plugin at position 1: Plugin warning.\n' +
+				'8: export {url, assert, path};\n' +
+				'(!) Plugin test-plugin: Plugin warning.\n' +
 				"(!) Module level directives cause errors when bundled, 'use stuff' was ignored.\n" +
 				'main.js: (1:0)\n' +
 				"1: 'use stuff';\n" +

test/cli/samples/warn-multiple/main.js

@@ -2,9 +2,7 @@
 
 import url from 'url';
 import assert from 'assert';
-import 'external';
+import path from 'path';
 import {doesNotExist} from './dep.js';
 
-console.log(this);
-
-export {url, assert as default};
+export {url, assert, path};

test/cli/samples/warn-multiple/rollup.config.js

@@ -1,15 +1,16 @@
 module.exports = {
 	input: 'main.js',
-	external: ['url', 'assert', 'external'],
+	external: ['url', 'assert', 'path'],
 	plugins: [
 		{
+			name: 'test-plugin',
 			buildStart() {
 				this.warn('Plugin warning.');
 			}
 		}
 	],
 	output: {
 		name: 'bundle',
-		format: 'iife'
+		format: 'amd'
 	}
 };