prevent irrelevant warning in test

test/function/wraps-ambiguous-default-export/_config.js

@@ -1,10 +1,3 @@
-const assert = require( 'assert' );
-
 module.exports = {
-	description: 'wraps a function expression callee in parens to avoid it being parsed as function declaration (#1011)',
-	warnings: warnings => {
-		assert.deepEqual( warnings, [
-			'foo.js (1:15) Ambiguous default export (is a call expression, but looks like a function declaration). See https://github.com/rollup/rollup/wiki/Troubleshooting#ambiguous-default-export'
-		]);
-	}
+	description: 'wraps a function expression callee in parens to avoid it being parsed as function declaration (#1011)'
 };

test/function/wraps-ambiguous-default-export/foo.js

@@ -1,6 +1,4 @@
 export default function foo ( x ) {
 	assert.equal( x, 42 );
 	global.ran = true;
-}
-
-( 42 );
+}( 42 );