Introduce PyScriptTest, an helper class to write integration tests (#663

)

This PR is about integration tests: they use playwright to load HTML pages in the browser and check that PyScript works as intended, as opposed to unit tests like the ones being introduced by #665 and #661.

The main goal of this PR is to introduce some machinery to make such tests easier to write, read and maintain, with some attention to capture enough information to produce useful error messages in case they fail in the CI.

In order to use the machinery, you need to subclass tests.support.PyScriptTest, which provides several useful API calls in the form self.xxx().

See the full description here:
#663

Co-authored-by: Mariana Meireles <marian.meireles@gmail.com>
Co-authored-by: mariana <marianameireles@protonmail.com>

pyscriptjs/src/components/pyconfig.ts

@@ -119,6 +119,7 @@ export class PyodideRuntime extends Object {
         for (const initializer of postInitializers_) {
             await initializer();
         }
+        console.log('===PyScript page fully initialized===');
     }
 }
 

pyscriptjs/tests/conftest.py

@@ -5,6 +5,13 @@
 
 import pytest
 
+from .support import Logger
+
+
+@pytest.fixture(scope="session")
+def logger():
+    return Logger()
+
 
 class HTTPServer(SuperHTTPServer):
     """
@@ -23,12 +30,17 @@ def run(self):
 
 
 @pytest.fixture(scope="session")
-def http_server():
+def http_server(logger):
+    class MyHTTPRequestHandler(SimpleHTTPRequestHandler):
+        def log_message(self, fmt, *args):
+            logger.log("http_server", fmt % args, color="blue")
+
     host, port = "127.0.0.1", 8080
     base_url = f"http://{host}:{port}"
 
     # serve_Run forever under thread
-    server = HTTPServer((host, port), SimpleHTTPRequestHandler)
+    server = HTTPServer((host, port), MyHTTPRequestHandler)
+
     thread = threading.Thread(None, server.run)
     thread.start()