Tests: Add automated testing framework with coverage support

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

tests/test_llc_compilation.py

@@ -0,0 +1,32 @@
+"""
+Level 2 — LLC compilation tests.
+
+For every BPF test file, runs the full compile_to_ir() + _run_llc() pipeline
+and asserts a non-empty .o file is produced.
+
+Tests in failing_tests/ are marked xfail (strict=True) by conftest.py.
+"""
+
+import logging
+from pathlib import Path
+
+
+from tests.framework.compiler import run_ir_generation, run_llc
+
+
+def test_llc_compilation(bpf_test_file: Path, tmp_path, caplog):
+    ll_path = tmp_path / "output.ll"
+    obj_path = tmp_path / "output.o"
+
+    run_ir_generation(bpf_test_file, ll_path)
+
+    error_records = [r for r in caplog.records if r.levelno >= logging.ERROR]
+    assert not error_records, "IR generation produced ERROR log(s):\n" + "\n".join(
+        f"  [{r.name}] {r.getMessage()}" for r in error_records
+    )
+
+    run_llc(ll_path, obj_path)
+
+    assert obj_path.exists() and obj_path.stat().st_size > 0, (
+        "llc did not produce a non-empty .o file"
+    )