Tests: Add automated testing framework with coverage support

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tests/framework/compiler.py

@@ -0,0 +1,23 @@
+import logging
+from pathlib import Path
+
+from pythonbpf.codegen import compile_to_ir, _run_llc
+
+
+def run_ir_generation(test_path: Path, output_ll: Path):
+    """Run compile_to_ir on a BPF test file.
+
+    Returns the (output, structs_sym_tab, maps_sym_tab) tuple from compile_to_ir.
+    Raises on exception. Any logging.ERROR records captured by pytest caplog
+    indicate a compile failure even when no exception is raised.
+    """
+    return compile_to_ir(str(test_path), str(output_ll), loglevel=logging.WARNING)
+
+
+def run_llc(ll_path: Path, obj_path: Path) -> bool:
+    """Compile a .ll file to a BPF .o using llc.
+
+    Raises subprocess.CalledProcessError on failure (llc uses check=True).
+    Returns True on success.
+    """
+    return _run_llc(str(ll_path), str(obj_path))