Fix XHR Test

tests/python/test_xhr.py

@@ -0,0 +1,97 @@
+from http.server import HTTPServer, BaseHTTPRequestHandler
+import pythonmonkey as pm
+import threading
+import asyncio
+import json
+
+def test_xhr():
+  class TestHTTPRequestHandler(BaseHTTPRequestHandler):
+    def log_request(self, *args) -> None:
+      return
+
+    def do_GET(self):
+      self.send_response(200)
+      self.end_headers()
+      self.wfile.write(b"get response")
+
+    def do_POST(self):
+      self.send_response(200)
+      self.send_header('Content-Type', 'application/json')
+      self.end_headers()
+      length = int(self.headers.get('Content-Length'))
+      json_string = self.rfile.read(length).decode("utf-8")
+      parameter_dict = json.loads(json_string)
+      parameter_dict["User-Agent"] = self.headers['User-Agent']
+      data = json.dumps(parameter_dict).encode("utf-8")
+      self.wfile.write(data)
+
+  httpd = HTTPServer(('localhost', 4001), TestHTTPRequestHandler)
+  thread = threading.Thread(target = httpd.serve_forever)
+  thread.daemon = True
+  thread.start()
+
+  async def async_fn():
+    assert "get response" == await pm.eval("""
+      new Promise(function (resolve, reject) {
+        let xhr = new XMLHttpRequest();
+        xhr.open('GET', 'http://localhost:4001');
+
+        xhr.onload = function ()
+        {
+          if (this.status >= 200 && this.status < 300)
+          {
+            resolve(this.response);
+          }
+          else
+          {
+            reject(new Error(JSON.stringify({
+              status: this.status,
+              statusText: this.statusText
+            })));
+          }
+        };
+
+        xhr.onerror = function (ev)
+        {
+          reject(ev.error);
+        };
+        xhr.send();
+      });
+      """)
+
+    post_result = await pm.eval("""
+      new Promise(function (resolve, reject) 
+      {
+        let xhr = new XMLHttpRequest();
+        xhr.open('POST', 'http://localhost:4001');
+
+        xhr.onload = function () 
+        {
+          if (this.status >= 200 && this.status < 300) 
+          {
+            resolve(this.response);
+          }
+          else 
+          {
+            reject(new Error(JSON.stringify({
+              status: this.status,
+              statusText: this.statusText
+            })));
+          }
+        };
+
+        xhr.onerror = function (ev) 
+        {
+          console.log(ev)
+          reject(ev.error);
+        };
+
+        xhr.send(JSON.stringify({fromPM: "snakesandmonkeys"}));
+      })
+      """)
+
+    result_json = json.loads(post_result)
+    assert result_json["fromPM"] == "snakesandmonkeys"
+    assert result_json["User-Agent"].startswith("Python/")
+    httpd.shutdown()
+  asyncio.run(async_fn())