Node.js: response body chunk can now be a Uint8Array.

Starting from Node.js 15.0.0 the chunk parameter of the response.write()
can be a Uint8Array.

This closes #870 issue on GitHub.

test/node/write_array/app.js

@@ -0,0 +1,4 @@
+require('http').createServer(function (req, res) {
+    res.writeHead(200, {'Content-Length': 5, 'Content-Type': 'text/plain'})
+        .end(new Uint8Array(Buffer.from('array', 'utf8')));
+}).listen(7080);

test/node/write_buffer/app.js

@@ -1,5 +1,5 @@
 
 require('http').createServer(function (req, res) {
     res.writeHead(200, {'Content-Type': 'text/plain'})
-       .end(new Buffer([0x62, 0x75, 0x66, 0x66, 0x65, 0x72]));
+       .end(Buffer.from('buffer', 'utf8'));
 }).listen(7080);

test/test_node_application.py

@@ -149,6 +149,10 @@ def test_node_application_write_buffer():
 
     assert client.get()['body'] == 'buffer', 'write buffer'
 
+def test_node_application_write_array():
+    client.load('write_array')
+
+    assert client.get()['body'] == 'array', 'write array'
 
 def test_node_application_write_callback(temp_dir):
     client.load('write_callback')