fix: refresh occluded browser windows before plugin capture

tests/browser_smoke.py

@@ -2,6 +2,8 @@
 
 import argparse
 import asyncio
+import base64
+import io
 import json
 import re
 import subprocess
@@ -13,9 +15,10 @@ from pathlib import Path
 import psutil
 from mcp import ClientSession, StdioServerParameters
 from mcp.client.stdio import stdio_client
+from PIL import Image
 
 
-async def main(executable, chrome):
+async def main(executable, chrome, occlude=False):
     received = []
 
     class Handler(BaseHTTPRequestHandler):
@@ -26,7 +29,7 @@ async def main(executable, chrome):
             body = b"""<!doctype html><meta charset="utf-8"><title>ARTEMIS Browser Fixture</title>
             <style>body{font:24px sans-serif;margin:40px}input,button{font:inherit;padding:12px;display:block;margin:20px 0}</style>
             <h1>ARTEMIS Browser Fixture</h1><label>Test parameter<input aria-label="Test parameter" id="value"></label>
-            <button aria-label="Apply parameter" onclick="fetch('/save',{method:'POST',body:document.getElementById('value').value}).then(()=>document.getElementById('result').textContent='Saved: '+document.getElementById('value').value)">Apply parameter</button>
+            <button aria-label="Apply parameter" onclick="fetch('/save',{method:'POST',body:document.getElementById('value').value}).then(()=>{document.getElementById('result').textContent='Saved: '+document.getElementById('value').value;document.body.style.backgroundColor='#10e020'})">Apply parameter</button>
             <div id="result" aria-live="polite">Pending</div>"""
             self.send_response(200)
             self.send_header("Content-Type", "text/html; charset=utf-8")
@@ -52,13 +55,40 @@ async def main(executable, chrome):
                 "--disable-extensions",
                 "--app=http://127.0.0.1:" + str(server.server_port),
                 "--window-size=800,600",
+                "--window-position=100,100",
             ],
             stdout=subprocess.DEVNULL,
             stderr=subprocess.DEVNULL,
             creationflags=subprocess.CREATE_NO_WINDOW,
         )
+        cover = None
         try:
             await asyncio.sleep(3)
+            if occlude:
+                ready = Path(folder) / "cover.ready"
+                cover = await asyncio.create_subprocess_exec(
+                    "powershell.exe",
+                    "-NoProfile",
+                    "-NonInteractive",
+                    "-File",
+                    str(Path(__file__).with_name("capture-fixture.ps1")),
+                    "-Title",
+                    "ARTEMIS Browser Occlusion Fixture",
+                    "-Cover",
+                    "-Width",
+                    "1000",
+                    "-Height",
+                    "800",
+                    "-ReadyFile",
+                    str(ready),
+                    stdout=subprocess.DEVNULL,
+                    stderr=subprocess.DEVNULL,
+                    creationflags=subprocess.CREATE_NO_WINDOW,
+                )
+                async with asyncio.timeout(10):
+                    while not ready.exists():
+                        await asyncio.sleep(0.05)
+                await asyncio.sleep(1)
             async with (
                 stdio_client(
                     StdioServerParameters(command=str(executable), args=["mcp"])
@@ -79,6 +109,8 @@ async def main(executable, chrome):
                 )
                 pid = re.search(r"pid=(\d+)", line).group(1)
 
+                captured = []
+
                 async def observe():
                     response = await session.call_tool("get_app_state", {"app": pid})
                     assert not response.isError, response
@@ -88,6 +120,9 @@ async def main(executable, chrome):
                     assert any(b.type == "image" for b in response.content), (
                         "Browser capture unavailable"
                     )
+                    captured.append(
+                        next(b.data for b in response.content if b.type == "image")
+                    )
                     return content
 
                 state = await observe()
@@ -127,10 +162,22 @@ async def main(executable, chrome):
                 state = await observe()
                 assert received == ["ARTEMIS 中文参数"], json.dumps(received)
                 assert "Saved: ARTEMIS 中文参数" in state
+                with Image.open(
+                    io.BytesIO(base64.b64decode(captured[-1]))
+                ) as screenshot:
+                    pixels = list(screenshot.convert("RGB").getdata())
+                    green = sum(g > 180 and r < 80 and b < 80 for r, g, b in pixels)
+                    assert green > len(pixels) / 3, (
+                        "Screenshot did not reflect the submitted page change"
+                    )
                 print(
                     "PASS: isolated browser form changed, submitted once and read back through MCP"
                 )
         finally:
+            if cover:
+                if cover.returncode is None:
+                    cover.terminate()
+                await asyncio.wait_for(cover.wait(), 10)
             try:
                 parent = psutil.Process(process.pid)
                 children = parent.children(recursive=True)
@@ -151,5 +198,6 @@ if __name__ == "__main__":
     parser = argparse.ArgumentParser()
     parser.add_argument("executable", type=Path)
     parser.add_argument("--chrome", type=Path, required=True)
+    parser.add_argument("--occlude", action="store_true")
     options = parser.parse_args()
-    asyncio.run(main(options.executable.resolve(), options.chrome))
+    asyncio.run(main(options.executable.resolve(), options.chrome, options.occlude))

tests/capture-fixture.ps1

@@ -1,9 +1,9 @@
-param([string]$Title, [string]$ReadyFile, [switch]$Cover)
+param([string]$Title, [string]$ReadyFile, [switch]$Cover, [int]$Width=500, [int]$Height=300)
 Add-Type -AssemblyName System.Windows.Forms
 Add-Type -AssemblyName System.Drawing
 $form = New-Object System.Windows.Forms.Form
 $form.Text = $Title
-$form.Size = New-Object System.Drawing.Size(500, 300)
+$form.Size = New-Object System.Drawing.Size($Width, $Height)
 $form.StartPosition = 'Manual'
 $form.Location = New-Object System.Drawing.Point(100, 100)
 $form.TopMost = $true