add failing test for #335

test/function/side-effect-import-order/_config.js

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+module.exports = {
+	solo: true,
+	show: true,
+	description: 'imports side-effects in the right order (#335)'
+};

test/function/side-effect-import-order/foo.js

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+export default global.polyfilled ? 'polyfilled' : 'unpolyfilled';

test/function/side-effect-import-order/main.js

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+import './polyfill.js';
+import foo from './foo.js';
+
+assert.equal( foo, 'polyfilled' );

test/function/side-effect-import-order/polyfill.js

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+global.polyfilled = true;