gh-146197: Run -m test.pythoninfo on the Emscripten CI (#146332)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
(cherry picked from commit a57209e)

Author: vstinner

Platforms/emscripten/__main__.py

@@ -580,6 +580,8 @@ def run_emscripten_python(context):
 
     if context.test:
         args = load_config_toml()["test-args"] + args
+    elif context.pythoninfo:
+        args = load_config_toml()["pythoninfo-args"] + args
 
     os.execv(str(exec_script), [str(exec_script), *args])
 
@@ -703,10 +705,16 @@ def main():
         action="store_true",
         default=False,
         help=(
-            "If passed, will add the default test arguments to the beginning of the command. "
+            "Add the default test arguments to the beginning of the command. "
             "Default arguments loaded from Platforms/emscripten/config.toml"
         )
     )
+    run.add_argument(
+        "--pythoninfo",
+        action="store_true",
+        default=False,
+        help="Run -m test.pythoninfo",
+    )
     run.add_argument(
         "args",
         nargs=argparse.REMAINDER,

Platforms/emscripten/config.toml

@@ -11,6 +11,9 @@ test-args = [
     "--single-process",
     "-W",
 ]
+pythoninfo-args = [
+    "-m", "test.pythoninfo",
+]
 
 [libffi]
 url = "https://github.com/libffi/libffi/releases/download/v{version}/libffi-{version}.tar.gz"