From 6ed14d4ef2bd6aa0a8524cc3cc405b10b41f9607 Mon Sep 17 00:00:00 2001
From: Hood Chatham <roberthoodchatham@gmail.com>
Date: Thu, 19 Mar 2026 23:14:13 +0100
Subject: [PATCH] gh-145177: Add emscripten run --test, uses test args from
 config.toml (GH-146160)

This allows us to change the test arguments from the python repo rather
than having to change buildmaster-config.
(cherry picked from commit 6b5511d66bab0754d1d959cfe98947c536bf4d82)

Co-authored-by: Hood Chatham <roberthoodchatham@gmail.com>
Co-authored-by: Russell Keith-Magee <russell@keith-magee.com>
---
 Platforms/emscripten/__main__.py | 15 ++++++++++++++-
 Platforms/emscripten/config.toml |  8 ++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/Platforms/emscripten/__main__.py b/Platforms/emscripten/__main__.py
index a7c52c2d59f10d..1aef9fcede3d30 100644
--- a/Platforms/emscripten/__main__.py
+++ b/Platforms/emscripten/__main__.py
@@ -573,7 +573,10 @@ def run_emscripten_python(context):
     if args and args[0] == "--":
         args = args[1:]
 
-    os.execv(str(exec_script), [str(exec_script)] + args)
+    if context.test:
+        args = load_config_toml()["test-args"] + args
+
+    os.execv(str(exec_script), [str(exec_script), *args])
 
 
 def build_target(context):
@@ -685,6 +688,15 @@ def main():
         "run",
         help="Run the built emscripten Python",
     )
+    run.add_argument(
+        "--test",
+        action="store_true",
+        default=False,
+        help=(
+            "If passed, will add the default test arguments to the beginning of the command. "
+            "Default arguments loaded from Platforms/emscripten/config.toml"
+        )
+    )
     run.add_argument(
         "args",
         nargs=argparse.REMAINDER,
@@ -694,6 +706,7 @@ def main():
         )
     )
     add_cross_build_dir_option(run)
+
     clean = subcommands.add_parser(
         "clean", help="Delete files and directories created by this script"
     )
diff --git a/Platforms/emscripten/config.toml b/Platforms/emscripten/config.toml
index 4e76b5bf9f7d2b..c474078fb48ba3 100644
--- a/Platforms/emscripten/config.toml
+++ b/Platforms/emscripten/config.toml
@@ -3,6 +3,14 @@
 # Python versions.
 emscripten-version = "4.0.12"
 node-version = "24"
+test-args = [
+    "-m", "test",
+    "-v",
+    "-uall",
+    "--rerun",
+    "--single-process",
+    "-W",
+]
 
 [libffi]
 url = "https://github.com/libffi/libffi/releases/download/v{version}/libffi-{version}.tar.gz"