write smoke_tests/test_render_scraper_script.py

smoke_tests/test_render_scraper_script.py

@@ -1,18 +1,23 @@
 from __future__ import annotations
 
+import ast
 import importlib.util
 import re
 from pathlib import Path
 
 
-def test_render_scraper_script_has_no_numeric_underscore_literals() -> None:
+def _load_agent_module():
     agent_path = Path(__file__).resolve().parents[1] / "agent.py"
     spec = importlib.util.spec_from_file_location("agent", agent_path)
     assert spec is not None and spec.loader is not None
     module = importlib.util.module_from_spec(spec)
     spec.loader.exec_module(module)
+    return module
 
-    script = module._render_scraper_script(
+
+def _render_script() -> str:
+    module = _load_agent_module()
+    return module._render_scraper_script(
         {
             "url": "https://example.com/",
             "selectors": {"title": "title"},
@@ -28,12 +33,27 @@ def test_render_scraper_script_has_no_numeric_underscore_literals() -> None:
         }
     )
 
+
+def test_render_scraper_script_parses_as_python_35() -> None:
+    script = _render_script()
+    ast.parse(script, feature_version=(3, 5))
+
+
+def test_render_scraper_script_has_no_forbidden_modern_syntax_markers() -> None:
+    script = _render_script()
+
     numeric_underscore_literal = re.compile(r"(?<![A-Za-z0-9_])\d+(?:_\d+)+(?![A-Za-z0-9_])")
+    f_string_prefix = re.compile(r"(?<![A-Za-z0-9_])(?:[fF]|[rR][fF]|[fF][rR])(['\"])")
+
     assert numeric_underscore_literal.findall(script) == []
+    assert f_string_prefix.findall(script) == []
+    assert "2_000_000" not in script
     assert "response.read(2000000)" in script
-    assert "response.read(2_000_000)" not in script
+    assert ":=" not in script
+    assert "pathlib" not in script
 
 
 if __name__ == "__main__":
-    test_render_scraper_script_has_no_numeric_underscore_literals()
-    print("smoke ok: no numeric underscore literals; response.read(2000000) present")
+    test_render_scraper_script_parses_as_python_35()
+    test_render_scraper_script_has_no_forbidden_modern_syntax_markers()
+    print("smoke ok: rendered scraper script parses as Python 3.5 and contains no forbidden markers")