feat(tooling, tests): detect and mark gas-checking tests

Justfile

@@ -181,6 +181,7 @@ test-tests *args:
         -n {{ xdist_workers }} \
         --basetemp="{{ output_dir }}/test-tests/tmp" \
         --ignore=src/execution_testing/cli/pytest_commands/plugins/filler/tests/test_benchmarking.py \
+        --ignore=src/execution_testing/cli/pytest_commands/plugins/filler/tests/test_gas_taint_e2e.py \
         "$@" \
         src
 
@@ -192,6 +193,7 @@ test-tests-pypy *args:
         -n auto --maxprocesses 6 \
         --basetemp="{{ output_dir }}/test-tests-pypy/tmp" \
         --ignore=src/execution_testing/cli/pytest_commands/plugins/filler/tests/test_benchmarking.py \
+        --ignore=src/execution_testing/cli/pytest_commands/plugins/filler/tests/test_gas_taint_e2e.py \
         "$@" \
         src
 
@@ -205,6 +207,31 @@ test-tests-bench *args:
         "$@" \
         packages/testing/src/execution_testing/cli/pytest_commands/plugins/filler/tests/test_benchmarking.py
 
+# Scan tests for gas assertions and apply @pytest.mark.gas_check to them
+[group('gas check')]
+mark_gas_tests *args:
+    @mkdir -p "{{ output_dir }}/mark-gas-tests/tmp"
+    uv run fill \
+        --detect-gas-checks \
+        --gas-check-report="{{ output_dir }}/mark-gas-tests/gas_check_report.json" \
+        -m "not slow" \
+        -n {{ xdist_workers }} --dist=loadgroup \
+        --clean \
+        --skip-index \
+        --output="{{ output_dir }}/mark-gas-tests/fixtures" \
+        "$@"
+    uv run python scripts/mark_tests.py \
+        "{{ output_dir }}/mark-gas-tests/gas_check_report.json"
+
+# Run the gas_taint plugin end-to-end (pytester) tests
+[group('gas check')]
+mark_gas_tests_test *args:
+    @mkdir -p "{{ output_dir }}/mark-gas-tests-test/tmp"
+    uv run pytest \
+        --basetemp="{{ output_dir }}/mark-gas-tests-test/tmp" \
+        "$@" \
+        packages/testing/src/execution_testing/cli/pytest_commands/plugins/filler/tests/test_gas_taint_e2e.py
+
 # Run CI release script integration tests
 [group('unit tests')]
 test-ci-scripts *args:

packages/testing/src/execution_testing/cli/pytest_commands/plugins/filler/filler.py

@@ -1700,6 +1700,18 @@ def __init__(self, *args: Any, **kwargs: Any) -> None:
 
                 super(BaseTestWrapper, self).__init__(*args, **kwargs)
 
+                if getattr(request.config, "_gas_taint_enabled", False):
+                    from .gas_taint import collect_taint_hits
+
+                    hits = collect_taint_hits(self, request.node)
+                    if hits:
+                        request.config._gas_taint_results[  # type: ignore[attr-defined]
+                            request.node.nodeid
+                        ] = hits
+                        request.node.user_properties.append(
+                            ("gas_taint_hits", hits)
+                        )
+
                 # Get the filling session from config
                 session: FillingSession = request.config.filling_session  # type: ignore
                 assert isinstance(session, FillingSession)