Test for plural resolveId functions.

test/function/custom-path-resolver-plural/_config.js

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+var path = require( 'path' );
+var assert = require( 'assert' );
+
+module.exports = {
+	description: 'uses custom path resolvers (plural)',
+	options: {
+		resolveId: [
+			function ( importee ) {
+				if ( importee[0] === '@' )
+					return path.resolve( __dirname, 'globals-' + importee.slice( 1 ).toLowerCase() + '.js' );
+			},
+			function ( importee ) {
+				if ( importee[0] === '!' ) return '<empty>';
+			}
+		],
+		load: function ( id ) {
+			if ( id === '<empty>' ) return '';
+		}
+	},
+	exports: function ( exports ) {
+		assert.strictEqual( exports.res, 0 );
+	}
+};

test/function/custom-path-resolver-plural/globals-math.js

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+export var sin = Math.sin;
+export var cos = Math.cos;

test/function/custom-path-resolver-plural/main.js

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+import { sin } from '@Math';
+import '!path';
+
+export var res = sin( 0 );