test: add zlib close-after-error regression test

Add a regression test based on the report in
https://github.com/nodejs/node/issues/6034.

PR-URL: https://github.com/nodejs/node/pull/6270
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-zlib-close-after-error.js

@@ -0,0 +1,14 @@
+'use strict';
+// https://github.com/nodejs/node/issues/6034
+
+const common = require('../common');
+const assert = require('assert');
+const zlib = require('zlib');
+
+const decompress = zlib.createGunzip(15);
+
+decompress.on('error', common.mustCall((err) => {
+  assert.doesNotThrow(() => decompress.close());
+}));
+
+decompress.write('something invalid');