Include synthetic.html in rust-justhtml benchmarks

Updated compare.py to include test_files directory for rust-justhtml
benchmarks, ensuring synthetic.html (21MB stress test) is included.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kylehowells

Benchmarks/BENCHMARK_RESULTS.md

@@ -1,12 +1,12 @@
 # Cross-Implementation Benchmark Results
 
-**Generated:** 2025-12-20 08:25:39
+**Generated:** 2025-12-20 08:43:16
 
 ## Repository Versions
 
 | Project | Branch | Commit | Date |
 |---------|--------|--------|------|
-| swift-justhtml | master | `8a175066b4d9` | 2025-12-19 |
+| swift-justhtml | master | `95140a64878b` | 2025-12-20 |
 | justhtml (Python) | main | `63c29b26be64` | 2025-12-16 |
 | justjshtml (JavaScript) | main | `e29dbd3166e9` | 2025-12-16 |
 | html5ever (Rust) | main | `795caf4166a8` | 2025-12-05 |
@@ -29,30 +29,30 @@ All implementations produce **identical output** for all test files.
 
 | File | Size | html5ever | rust-justhtml | Swift | JavaScript | Python |
 |------|------|-----------|---------------|-------|------------|--------|
-| hackernews.html | 34 KB | 0.49 ms | 0.82 ms | 2.07 ms | 1.78 ms | 7.75 ms |
-| synthetic.html | 20498 KB | 277.46 ms | N/A | 1218.07 ms | 911.40 ms | 3598.33 ms |
-| wikipedia_countries.html | 360 KB | 3.95 ms | 7.29 ms | 14.27 ms | 15.29 ms | 90.98 ms |
-| wikipedia_html.html | 472 KB | 5.19 ms | 10.89 ms | 19.04 ms | 21.49 ms | 104.24 ms |
-| wikipedia_swift.html | 411 KB | 4.55 ms | 9.70 ms | 16.96 ms | 16.40 ms | 133.33 ms |
-| wikipedia_ww2.html | 1204 KB | 12.62 ms | 24.61 ms | 43.82 ms | 46.10 ms | 240.23 ms |
-| **TOTAL** | | **304 ms** | **53 ms** | **1314 ms** | **1012 ms** | **4175 ms** |
+| hackernews.html | 34 KB | 0.51 ms | 0.82 ms | 2.09 ms | 1.86 ms | 7.71 ms |
+| synthetic.html | 20498 KB | 274.73 ms | 642.55 ms | 1222.32 ms | 1083.18 ms | 3619.55 ms |
+| wikipedia_countries.html | 360 KB | 4.19 ms | 7.67 ms | 14.27 ms | 19.23 ms | 90.88 ms |
+| wikipedia_html.html | 472 KB | 5.41 ms | 10.81 ms | 18.93 ms | 25.03 ms | 105.46 ms |
+| wikipedia_swift.html | 411 KB | 4.61 ms | 8.98 ms | 17.23 ms | 19.89 ms | 133.11 ms |
+| wikipedia_ww2.html | 1204 KB | 12.64 ms | 25.14 ms | 43.78 ms | 57.04 ms | 240.39 ms |
+| **TOTAL** | | **302 ms** | **696 ms** | **1319 ms** | **1206 ms** | **4197 ms** |
 
 ## Summary
 
-- **Rust (html5ever)** total parse time: 304 ms
-- **rust-justhtml** total parse time: 53 ms
-- **Swift** total parse time: 1314 ms
-- **JavaScript** total parse time: 1012 ms
-- **Python** total parse time: 4175 ms
+- **Rust (html5ever)** total parse time: 302 ms
+- **rust-justhtml** total parse time: 696 ms
+- **Swift** total parse time: 1319 ms
+- **JavaScript** total parse time: 1206 ms
+- **Python** total parse time: 4197 ms
 
-**rust-justhtml** is the fastest implementation.
+**html5ever** is the fastest implementation.
 
-html5ever is **4.3x faster** than Swift.
-html5ever is **0.2x faster** than rust-justhtml.
-html5ever is **3.3x faster** than JavaScript.
-html5ever is **13.7x faster** than Python.
-rust-justhtml is **24.6x faster** than Swift.
-rust-justhtml is **78.3x faster** than Python.
+html5ever is **4.4x faster** than Swift.
+html5ever is **2.3x faster** than rust-justhtml.
+html5ever is **4.0x faster** than JavaScript.
+html5ever is **13.9x faster** than Python.
+rust-justhtml is **1.9x faster** than Swift.
+rust-justhtml is **6.0x faster** than Python.
 
 ## Test Files
 

Benchmarks/compare.py

@@ -216,11 +216,17 @@ def run_rust_justhtml_benchmark():
         print(f"rust-justhtml build failed:\n{result.stderr}", file=sys.stderr)
         return None
 
-    # Run benchmark on each sample file
+    # Run benchmark on each sample file (including test_files for synthetic.html)
     benchmark_binary = rust_justhtml_dir / "target" / "release" / "benchmark"
     results = []
 
-    for sample in sorted(SAMPLES_DIR.glob("*.html")):
+    # Collect files from both samples and test_files directories
+    all_samples = list(SAMPLES_DIR.glob("*.html"))
+    test_files_dir = SCRIPT_DIR / "test_files"
+    if test_files_dir.exists():
+        all_samples.extend(test_files_dir.glob("*.html"))
+
+    for sample in sorted(all_samples, key=lambda p: p.name):
         result = subprocess.run(
             [str(benchmark_binary), "--file", str(sample), "--json"],
             capture_output=True,