fix: Update JavaScript execution in AsyncPlaywrightCrawlerStrategy to handle script errors and add basic download test case. ref #1215

tests/general/test_download_file.py

@@ -0,0 +1,34 @@
+import asyncio
+from crawl4ai import CrawlerRunConfig, AsyncWebCrawler, BrowserConfig
+from pathlib import Path
+import os
+
+async def test_basic_download():
+    
+    # Custom folder (otherwise defaults to ~/.crawl4ai/downloads)
+    downloads_path = os.path.join(Path.home(), ".crawl4ai", "downloads")
+    os.makedirs(downloads_path, exist_ok=True)
+    browser_config = BrowserConfig(
+        accept_downloads=True,
+        downloads_path=downloads_path
+    )
+    async with AsyncWebCrawler(config=browser_config) as crawler:
+        run_config = CrawlerRunConfig(
+            js_code="""
+                const link = document.querySelector('a[href$=".exe"]');
+                if (link) { link.click(); }
+            """,
+            delay_before_return_html=5  
+        )
+        result = await crawler.arun("https://www.python.org/downloads/", config=run_config)
+
+        if result.downloaded_files:
+            print("Downloaded files:")
+            for file_path in result.downloaded_files:
+                print("•", file_path)
+        else:
+            print("No files downloaded.")
+
+if __name__ == "__main__":
+    asyncio.run(test_basic_download())
+